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To obtain localized resonance within a sample

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324 - Electricity: measuring and testing

324300000 - PARTICLE PRECESSION RESONANCE

324307000 - Using a nuclear resonance spectrometer system

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DocumentTitleDate
20110175613PROPELLER/BLADE MRI WITH NON-LINEAR MAPPING TO K-SPACE - A magnetic resonance imaging apparatus and method acquires NMR signal data for a periodically rotated data acquisition region in k-space wherein the acquisition region is caused to have non-linear acquisition loci. As an example, the width of the data acquisition region at a point distant from the origin of k-space is made larger than at a point nearer the origin of k-space thereby more fully filling k-space with acquired NMR data even if the number of RF pulse shots is reduced and/or the number of data acquisition region positions is reduce. A magnetic resonance image is reconstructed based on the acquired NMR signal data in k-space.07-21-2011
20110175609Method for Motion Correction in Magnetic Resonance Imaging Using Radio Frequency Coil Arrays - A method for motion correction using coil arrays, termed “MOCCA,” is provided, in which coil-dependent motion-related signal variations are employed to determine information related to motion in two and three directions. With such a method, navigator echoes are not required, nor is the acquisition of additional data required to resolve complex motions in more than one direction. The motion estimation and compensation method provided by MOCCA is also applicable to applications of cardiac, respiratory, and other physiological self-gating techniques.07-21-2011
20130027038METHOD FOR RECORDING A MAGNETIC RESONANCE IMAGE - In a method for recording a magnetic resonance image with a magnetic resonance device, in which several projection image data records are recorded in succession with different gradient orientations, from which, through back projection, the magnetic resonance image is reconstructed, the recording of a projection data record in a recording time frame proceeds with a temporal frequency modulated excitation pulse of a pulse duration, wherein, through the frequency modulation of the excitation pulse, all spins to be recorded within the scope of the projection data record are excited in a temporal sequence and wherein the frequency modulation function describing the frequency modulation during the pulse duration exhibits at least one maximum and/or at least one minimum. During the excitation duration, a time-resolved reception signal is detected. The projection data record is determined from the reception signal through evaluation.01-31-2013
20130027036MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging apparatus configured to carry out a pulse sequence in synchronization with a biosignal is provided. The pulse sequence includes an RF pulse, and a data acquisition sequence for acquiring data when a wait time has passed after the RF pulse, wherein the wait time has a variable value that can be varied based on the biosignal.01-31-2013
20120161761TRANSMISSION LINE ARRAY FOR EXPLOSIVE DETECTION USING NUCLEAR QUADRUPOLE RESONANCE - A transmission line array is used for explosive/contraband detection using nuclear quadrupole resonance in which the array is driven in-phase with synchrony frequency-swept signals. Each of the balanced transmission lines is fed with a low power swept frequency source and stimulated emissions are picked out with a directional coupler. Location is provided using a cross grid array or a phase detector is used for each balanced line, with phase determining the distance to the sensed substance.06-28-2012
20100090695MAGNETIC RESONANCE IMAGING (MRI) APPARATUS AND METHOD FOR REDUCED EDDY CURRENT GENERATION IN THE IMAGED OBJECT - An MRI apparatus and method reduces eddy currents generated by changing gradient magnetic fields used to image an object. Positioning image data from a pilot imaging mode is used to set reference imaging conditions for a subsequent actual diagnostic imaging mode used to acquire diagnostic image data. An eddy current stimulus index is calculated for a gradient magnetic field polarity successively (i.e., iteratively) renewed (i.e., changed) by renewal of imaging conditions and phase-encoding direction. Diagnostic image data is generated during an actual diagnostic imaging mode based on a gradient magnetic field polarity and phase-encoding direction that provides the lowest eddy current stimulus index value, thus using an optimum set of imaging conditions.04-15-2010
20100090694METHOD AND DEVICE FOR AUTOMATED GENERATION OF A FORMAL DESCRIPTION OF A MAGNETIC RESONANCE SYSTEM MEASUREMENT SEQUENCE, USING A SEQUENCE MODEL - A magnetic resonance sequence model that is a formal description of a measurement sequence is used to automate measurement sequence programming. The sequence model allows a system-independent specification of the measurement sequence for execution in a magnetic resonance scanner. The sequence model is as formal as possible; it is limited to the minimum required information for description of a measurement sequence without limiting the flexibility in the sequence programming. A method for formal description of the measurement sequence describes the measurement sequence by a number of parameters to be parameterized. The parameterization of the measurement sequence can ensue automatically from the formalized description of the measurement sequence, except for a set of parameters that are still be determined. For automatic generation of an executable measurement sequence, the method determines the parameters to be determined using a solver, under consideration of boundary conditions, so that a consistent set of parameters is created that completely describes the measurement sequence. This complete description of parameter values of the measurement sequence is then be translated automatically into a programming language that can be directly executed in the magnetic resonance scanner.04-15-2010
20130027037SELF CONSISTENT PARALLEL IMAGING WITH TEMPORAL SENSITIVITY ESTIMATION IN REAL-TIME MAGNETIC RESONANCE IMAGING - Parallel imaging magnetic resonance reconstruction is performed with temporal sensitivity. Rather than estimate the coil sensitivity once for each coil of an array, the coil sensitivity at different times is estimated. The movement of the patient may result in different sensitivities at different times. By using the time varying sensitivity in iterative, self-consistent, non-linear parallel imaging, real-time imaging may be provided with stable artifacts in view of increasing SNR even with higher reduction factors (e.g., 4-6).01-31-2013
20100052678METHOD AND DEVICE TO GENERATE A MEASUREMENT SEQUENCE FOR OPERATING A MAGNETIC RESONANCE SYSTEM THAT IS ADAPTED TO THE TIME RASTER OF THE SYSTEM - In a method for producing a time raster-adapted measurement sequence that can be executed directly in the time raster of a magnetic resonance (MR) scanner, for a measurement sequence composed of a series of time slices that in their entirety represent the measurement sequence, the predetermined time slices are not necessarily of a suitable length in order to be directly translated into the time raster of the MR scanner. The method according to the invention produces this conversion automatically and additionally ensures that global properties of the measurement sequence are maintained. The method simplifies the programming of measurement sequences for MR. Moreover, the method is a requirement for the direct use of timing values determined by a solver. The method can be executed by a computerized device and can be implemented in the form of programming instructions encoded in a computer-readable medium.03-04-2010
20120169338System And Method For Generating A Magnetic Resonance Image Using Compressed Sensing And Parallel Imaging - A method for generating a magnetic resonance image includes acquiring a first k-space data set from each of a plurality of RF coils. The first k-space data set includes calibration data and randomly undersampled data. For each RF coil, a fully randomly sampled k-space data set is generated by removing a portion of the calibration data. A compressed sensing reconstruction technique is applied to the fully randomly sampled k-space data set to generate an aliased image, which is used to generate a uniformly undersampled k-space data set. A second k-space data set is generated by inserting the portion of the calibration data and a parallel imaging reconstruction technique is applied to the second k-space data set to synthesize unacquired data. The second k-space data set and the synthesized data are combined to generate a complete k-space data set for the RF coil.07-05-2012
20120169336MRI IMAGE DISTORTION REDUCTION FOR MRI IMAGES OF A RECIPIENT HAVING AN IMPLANTABLE MEDICAL DEVICE - A method for generating a new set of MRI images of a region of a recipient in which an implanted medical device having magnetic properties is located. The method includes scanning a plurality of scan slices of the recipient with an MRI machine set at a first fat shift direction to generate a first set of MRI images and rescanning the plurality of scan slices with a fat shift direction different than the first fat shift direction to obtain a second set of MRI images. At least one of the MRI images of the first set and the second set including an artifact resulting from the implanted medical device. The method further includes comparing respective artifacts of the MRI images of the first and second sets, and selecting one of the compared MRI images based on the distortion to the respective MRI image created by the respective artifact.07-05-2012
20100164496SYSTEM AND METHODS FOR ACTIVE SUPPRESSION OF SUPERIOR TAGGING IN FLOW-SENSITIVE ALTERNATING INVERSION RECOVERY - Apparatuses, systems, and methods for suppression of venous artifacts from superior tagging in flow-sensitive alternating inversion recovery. The systems may include an image capture device and a controller. The controller may be configured to cause the image capture device to perform a labeling experiment, capture a first image of a slice of body tissue, perform a control experiment, and capture a second image of the slice of body tissue. The systems may be configured to perform a ninety (90) degree RF saturation pulse directed to a portion of body tissue that is superior to the first slice of body tissue imaged during at least one of the labeling experiment and/or the control experiment, and to apply a spoiler gradient subsequent to the saturation pulse during at least one of the labeling experiment and/or the control experiment.07-01-2010
20100164495MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR CORRECTING ERROR DUE TO GRADIENT MAGNETIC FIELD - In a non-cartesian sampling method, in order to reduce an artifact on an image caused by an error of a gradient magnetic field, data for correcting the error caused by the gradient magnetic field are obtained when data used for image reconstruction are obtained, and the data used for the image reconstruction are corrected by using the obtained data for the correction. In order to obtain the data for correcting the error, a block having plural parallel echo signals is measured.07-01-2010
20090278537RADIO-FREQUENCY SURFACE COILS COMPRISING ON-BOARD DIGITAL RECEIVER CIRCUIT - A radio-frequency (RF) coil system that simplifies multi-nuclear magnetic resonance (MR) imaging is disclosed herein. The RF coil system comprises a transmitter coil (11-12-2009
20080258726Distinguishing Bound and Unbound Contrast Agents Using Magnetic Resonance - Magnetic resonance monitoring of a target (10-23-2008
20090121714METHOD AND MAGNETIC RESONANCE SYSTEM FOR DETERMINING THE FLIP ANGLE DISTRIBUTION IN A VOLUME OF AN EXAMINATION SUBJECT - In a method for determination of flip angle distributions for various antenna transmission configurations in a magnetic resonance system, magnetic resonance measurements are implemented with the various transmission configurations, with the reception configuration being identical for all implemented magnetic resonance measurements, and all magnetic resonance measurements for the various transmission configurations are implemented with a specific pulse sequence. This pulse sequence is selected such that the total function that describes the dependency of the image signal at a specific location on the flip angle achieved at this location with the radiated radio-frequency field, as well as on further MR-relevant parameters, can be factored into a first sub-function that describes the dependency of the image signal on the achieved flip angle and a second sub-function (Tb) that describes the dependency of the image signal on the further MR-relevant parameters, and such that the functional dependency of the image signal on the achieved flip angle is known. The absolute flip angle distribution is measured for a reference transmission configuration, and the flip angle distributions of the other transmission configurations are then respectively determined on the basis of the absolute flip angle distribution of the reference transmission configuration and on the basis of the ratio of the spatially-dependent image signals of the magnetic resonance measurements of the respective transmission configuration to the corresponding spatially-dependent image signals of the magnetic resonance measurement of the reference transmission configuration.05-14-2009
20100117645PROPELLER MRI WITH PHASE CORRECTION - The invention relates to a device for MRI of a body (05-13-2010
20100072998MAGNETIC RESONANCE METHOD AND DEVICE TO AUTOMATICALLY DIFFERENTIATE WATER-DOMINATED AND FAT-DOMINATED TISSUE - In a magnetic resonance method and system to automatically differentiate whether a pixel of an MR image acquired with magnetic resonance system originated from fat-dominated tissue or water-dominated tissue, only one spin echo-based magnetic resonance signal per pixel is acquired at a point in time at which the phase of a magnetic resonance signal of aqueous tissue has a phase opposite to the phase of a magnetic resonance signal of fat tissue. The phase angle of the pixel is then calculated, a base phase at the pixel depending on the magnetic resonance system is determined, and a corrected phase angle of the pixel is determined from the phase angle and the base phase. Whether the pixel originated from fat-dominated tissue or water-dominated tissue is then determined using the corrected phase angle of the pixel.03-25-2010
20100072997MAGNETIC RESONANCE SYSTEM WITH TRANSMISSION OF A DIGITIZED MAGNETIC RESONANCE SIGNAL ACROSS AN AIR GAP - A magnetic resonance system has a patient receptacle and a base body. The patient receptacle has a subframe and a patient bed supported thereon so as to move a patient thereon through the base body. The base body has a basic field magnet system, a gradient system and an RF system that are operable to obtain an analog magnetic resonance signal from the patient. The patient receptacle has a signal conversion device composed of an A/D converter, a modulator, and a transmitter. The base body has a signal conversion device composed of a receiver and a demodulator. The A/D converter receives the magnetic resonance signal and digitizes it. The modulator modulates a carrier signal with the digitized magnetic resonance signal. The transmitter transmits the modulated carrier signal via an air gap to the receive. The receiver receives the transmitted carrier signal. The demodulator extracts the digitized magnetic resonance signal from the received carrier signal by demodulation and supplies it to an evaluation device for continuing evaluation.03-25-2010
20100072996Methods And Systems For Magnetically Resonating Both A Subject And A Substance Administered To The Subject - Embodiments of the current invention include a magnetic resonance system including a magnetic resonance device and a substance to be introduced to a subject in accordance with a treatment. Further embodiments of the current invention include a method of using a magnetic resonance system including administering a substance to a subject and providing magnetic resonance to the subject.03-25-2010
20130076356MAGNETIC RESONANCE IMAGING METHOD AND APPARATUS TO CORRECT DISTORTIONS DUE TO INHOMOGENEITIES OF THE BASIC MAGNETIC FIELD - In a magnetic resonance method and system to correct spatial shifts in MR data, at least two measurement data sets are acquired, the additional measurement data set or sets being acquired while switching an additional gradient relative to acquisition of the first measurement data set. For respective corresponding measurement points of the measurement data sets, a phase difference is initially determined from the first measurement data set and at least one additional measurement data set acquired with the additional gradient, with a spatial shift of the measurement points of the first measurement data set being determined from the spatial shift. The magnitude values of the initially measured measurement points are distributed to their correct spatial position corresponding to the determined spatial shifts, so a corrected image data set is created.03-28-2013
20130076357METHOD AND MAGNETIC RESONANCE APPARATUS TO GENERATE A SERIES OF MR IMAGES TO MONITOR A POSITION OF AN INTERVENTIONAL DEVICE - In a magnetic resonance (MR) method and system to generate a series of MR images to monitor the position of an interventional device located in an examination region, radial scanning of k-space is combined with other scans, in particular for the k-space center. The measurement time until the entirety of k-space corresponding to the imaging region is scanned is thereby markedly shortened in total. The short echo times that are possible with this reduce susceptibility artifacts in the reconstructed image data and enable a depiction of tissue or substances with very short T2 values, for example plastics. Due to the rapidly repeated excitation and acquisition of measurement data and the reconstruction of image data, it is possible to monitor a position of the intervention device in the examination region.03-28-2013
20130076355Fast, Low Energy Deposition and Homogeneous T2 Weighted Variable Amplitude PSIF (T2 VAPSIF) Imaging in the Presence of B0inhomogeneities - A method for acquiring medical images, including: applying, during a first period, a plurality of radio frequency (RF) pulses to an area of interest, wherein the RF pulses applied during the first period are Kaiser-Bessel pulses; applying, during a second period, a plurality of 180 degree RF preparation pulses to the area; applying, during a third period, a plurality of 180 degree RF pulses to the area to acquire a center of a k-space; applying, during a fourth period, a plurality of RF pulses to the area, wherein the RF pulses applied during the fourth period have an angle smaller than the 180 degree RF pulses applied during the third period; applying, during a fifth period, a plurality of constant RF pulses to the area to acquire outer lines of the k-space; and generating an image of the area by using a steady-state free precession echo readout.03-28-2013
20130076354MAGNETIC RESONANCE SYSTEM AND METHOD FOR CARRYING OUT MAGNETIC RESONANCE MEASUREMENTS IN AN INTRAORAL REGION - The present embodiments relate to a magnetic resonance system for carrying out magnetic resonance measurements in an intraoral region. The magnetic resonance system includes a magnetic resonance coil element and an intraoral measuring device that measures the position of a number of measuring points situated in the intraoral region.03-28-2013
20130082704METHOD AND MAGNETIC RESONANCE APPARATUS FOR NON-SELECTIVE EXCITATION OF NUCLEAR SPIN SIGNALS IN AN EXAMINATION SUBJECT - In a method for non-selective excitation of nuclear spin signals in an examination subject with a magnetic resonance system, RF excitation pulses are radiated to excite nuclear spin signals in the examination subject with simultaneous switching of gradients for spatial coding of the excited nuclear spin signals, wherein the RF excitation pulses are designed such that the base frequency of a radiated RF excitation pulse is adapted to the simultaneously switched gradient. By the dynamic adaptation of the radiated RF excitation pulses to the respective simultaneously switched gradients, artifacts due to insufficiently excited nuclear spins in an examination region to be examined (in particular even in examination regions that are arranged off-center) are avoided.04-04-2013
20130082707Method for the Control of a Magnetic Resonance System - A method for the control of a magnetic resonance system is provided. In a test phase before a magnetic resonance measurement, a test high-frequency pulse with several parallel individual high-frequency pulses is transmitted with a transmitter antenna arrangement over various different high-frequency transmitter channels. At lower transmitter power, the test high-frequency pulse generates essentially the same field distribution as an excitation high-frequency pulse to be transmitted during a subsequent magnetic resonance measurement. A high-frequency field generated by this test high-frequency pulse is measured in at least one area of a local pulse arrangement, and on the basis of the high-frequency field measured, a high-frequency field value that is to be anticipated at the local coil arrangement during the subsequent magnetic resonance measurement is determined. The control of the magnetic resonance system during a later magnetic resonance measurement includes taking the high-frequency field value into account.04-04-2013
20130082705MAGNETIC RESONANCE SYSTEM AND METHOD FOR TIME SYNCHRONIZATION OF DIFFERENT COMPONENTS OF A MAGNETIC RESONANCE SYSTEM - A method for time synchronization of various components of a magnetic resonance system includes generating a series of amplitude-modulated radio-frequency pulses and associated gradient fields to deflect the magnetization of a slice detecting at least two spin signals, determining a phase difference between two of the spin signals, processing the phase difference in order to determine at least one time shift between two of the following variables that are generated by different components of the magnetic resonance system, an envelope of the amplitude-modulated radio-frequency pulses, a radio-frequency portion of the amplitude-modulated radio-frequency pulses, and one or more gradient fields, and synchronizing the associated components of the magnetic resonance system depending on the at least one time shift.04-04-2013
20130082703METHOD TO GENERATE MAGNETIC RESONANCE MEASUREMENT DATA WITH IMAGE CONTRAST SELECTED AND PRODUCED BY PREPARATION PULSES - In a method and magnetic resonance apparatus to generate magnetic resonance measurement data, k-space corresponding to the examination region is subdivided into a first region and a second region. The first region includes the k-space center, and a ratio of preparation pulses radiated by the radio-frequency antenna of the magnetic resonance apparatus to RF excitation pulses radiated by the radio-frequency antenna is greater in the first region than in a second region of k-space corresponding to the examination region that is not covered by the first region of k-space. Preparation pulses in the entirety of k-space corresponding to the examination region are therefore not radiated uniformly often, but instead a reduced number of preparation pulses is applied in the second region in comparison to the first region. The total measurement time to generate magnetic resonance data, as well as a SAR exposure, are reduced.04-04-2013
20130082706LOCAL ANTENNA DEVICE FOR TRANSMITTING MAGNETIC RESONANCE SIGNALS - A local antenna device for transmitting magnetic resonance (MR) signals of a plurality of MR receiving antenna elements to an MR signal processing device is provided. The local antenna device includes a plurality of analog-to-digital converters for scanning the MR signals and converting the MR signals to digital MR data, and a plurality of transmitting antenna elements for wirelessly transmitting the digital MR data to the MR signal processing device by the emission of an electromagnetic field. The local antenna device includes a plurality of transmitting devices for triggering the transmitting antenna elements and a plurality of spacer elements that is arranged and embodied on the local antenna device such that at least a defined minimum emission spacing is produced between the plurality of transmitting antenna elements and articles adjoining the local antenna device in at least one direction of a principal axis of emission of the electromagnetic field.04-04-2013
20130082702METHOD FOR DETERMINING MAGNETIC RESONANCE DATA AND A MAGNETIC RESONANCE SYSTEM - A method is disclosed for acquiring magnetic resonance (MR) data for a plurality of layers of an object to be examined in a section of a magnetic resonance system having a basic magnetic field, wherein the section is located at the edge of a Field of View of the magnetic resonance system in the first direction. The method includes producing a first gradient field having a non-linearity of its location dependence in such a way that in the section the non-linearity compensates a local inhomogeneity of the basic magnetic field, and then multiple positioning of the object to be examined in a first direction, so the plurality of layers of the object to be examined perpendicular to the first direction successively includes the section. Finally, it includes the acquisition of magnetic resonance data for each of the layers with recording sequences.04-04-2013
20130082708MAGNETIC RESONANCE IMAGING DEVICE AND TRANSMITTING SENSITIVITY DISTRIBUTION CALCULATION METHOD - B1 distribution is calculated in a short time with a high degree of precision, and a high quality image is obtained. In the RF shimming for irradiating electromagnetic waves using an RF coil having multiple channels, the absolute values of subtraction images between multiple reconstructed images are used to calculate a transmitting sensitivity distribution which is necessary for calculating inter-channel phase difference and amplitude ratio of RF pulses provided to the respective channels. Those multiple reconstructed images are obtained by executing the imaging sequence after applying a prepulse at different flip angles respectively. Assuming an image obtained with a minimum flip angle as a reference image, for instance, the subtraction images are created between the reference image and the other respective images. It is also possible that multiple subtraction images being obtained are divided by one another, and the transmitting sensitivity distribution is created on the basis of the division result.04-04-2013
20130033263METHOD AND MAGNETIC RESONANCE SYSTEM FOR ACQUIRING MAGNETIC RESONANCE DATA IN A PREDETERMINED REGION OF AN EXAMINATION SUBJECT - In a method and a magnetic resonance system to acquire MR data in a predetermined region within an examination subject, a first three-dimensional volume segment is selectively excited with an RF excitation pulse, this first volume segment including the predetermined region and having a first thickness along a first thickness direction. A selective refocusing pulse is activated in order to selectively refocus a second volume segment. The second volume segment likewise includes the predetermined region and has a second thickness along a second thickness direction orthogonal to the first thickness direction.02-07-2013
20130033262METHOD TO GENERATE MAGNETIC RESONANCE EXPOSURES - In a method described for generating magnetic resonance exposures in which diffusion-coded raw data are acquired with of a diffusion gradient measurement sequence having a number of partial diffusion gradient sequences, at least one diffusion coding gradient pulse is emitted in each partial data set, and raw data of a k-space region are acquired during a first echo after a defined first echo time the k-space regions in total covering a complete k-space. Raw data of an established navigator k-space region are acquired during a second echo after a second echo time the navigator k-space region being identical for different partial diffusion gradient sequences. Reference raw data are acquired by a reference measurement sequence with multiple partial reference sequences.02-07-2013
20130043869DECONVOLUTION OF CHEMICAL MIXTURES WITH HIGH COMPLEXITY BY NMR CONSENSUS TRACE CLUSTERING - This disclosure provides new multidimensional-NMR approaches that are useful in the analysis of mixtures with high complexity at natural 02-21-2013
20130043868METHOD AND APPARATUS FOR SIMULTANEOUSLY GENERATING MULTI-TYPE MAGNETIC RESONANCE IMAGES - An electromagnetic wave signal, having a pulse train in which pulses having a plurality of frequencies corresponding to multi-type atomic nuclei are arranged in a line, is applied to a target object located in a magnetic field by using a radio frequency (RF) coil in the magnetic field. Data of magnetic resonance signals corresponding to the multi-type atomic nuclei is collected from the RF coil, and multi-type magnetic resonance images corresponding to the multi-type atomic nuclei are generated by using the data of the magnetic resonance signals.02-21-2013
20130043867SIDEBAND PROCESSING FOR MAGNETIC RESONANCE - A method includes applying a pulse train to a spin system in a scanner. The pulse train has a plurality of discontinuities in a time domain. The method includes receiving a response from the spin system. The response corresponds to a gated signal. The method includes accessing a correction factor corresponding to the scanner. The method includes calculating a correction to the response based on the correction factor. The method includes generating an output based on the correction.02-21-2013
20100045292MAGNETIC RESONANCE ANGIOGRAPHY METHOD AND APPARATUS - In a magnetic resonance apparatus and method for generation of a magnetic resonance angiogram of a subphrenic vessel structure, a subject containing the subphrenic vessel structure is positioned in an imaging volume of a magnetic resonance apparatus, and MR measurement data are acquired using a radial k-space scanning scheme. An image of the vessel structure is reconstructed from the measurement data. Information about movement of the vessel structure to be examined is determined from the acquired measurement data and a movement correction is implemented in the reconstruction of the image using the extracted information.02-25-2010
20100045291MAGNETIC RESONANCE APPARATUS AND METHOD TO ACQUIRE AND DISPLAY CALIBRATION IMAGES - In a method and magnetic resonance apparatus to acquire and present calibration images of a periodically moving organ with the use of magnetic resonance technology, calibration images are acquired by acquiring measurement data for multiple calibration images during one continuous period of the organ movement, the multiple calibration images differing in their offset frequency and/or in their spatial position in the organ to be examined, and the calibration images in a presentation manner that, from the visual quality of the respective images, allows the user to select (identify) the image acquired with the offset frequency that should then be used to acquire the diagnostic image are displayed to a user.02-25-2010
20100045290MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR CONTROLLING THE SAME - A magnetic resonance imaging apparatus includes a coil control device that controls a transmission coil and a gradient coil such that (A) a longitudinal magnetization adjustment pulse sequence for setting a longitudinal magnetization component positive in value of a first body fluid smaller than a longitudinal magnetization component positive in value of a second body fluid is executed on the first and second body fluids, (B) a longitudinal magnetization reverse pulse for reversing the longitudinal magnetization components of the first and second body fluids is transmitted, and (C) a data acquisition pulse sequence for acquiring data of the first body fluid when an absolute value of the longitudinal magnetization component of the first body fluid flowing through an imaging area is larger than an absolute value of the longitudinal magnetization component of the second body fluid, is executed.02-25-2010
20120206141METHOD AND APPARATUS FOR SENSING THE PRESENCE OF EXPLOSIVES, CONTRABAND AND OTHER MOLECULES USING NUCLEAR QUADRUPOLE RESONANCE AND A SWEPT FREQUENCY CONTINUOUS WAVE SOURCE - Stimulated emissions due to nuclear quadropole resonance are detected utilizing a terminated balanced transmission line and a directional coupler for the detection of explosives, contraband, narcotics and the like that exist between the transmission lines, in which a swept frequency continuous wave generator is utilized to scan between 100 KHz and 10 MHz.08-16-2012
20100102812OPTIMIZED SPECTRAL-SPATIAL PULSE - A computer implemented method for designing a spectral-spatial pulse for exciting at least one passband and minimally exciting at least one stopband is provided. A uniform shaped spectral envelope is generated. For a plurality of k04-29-2010
20130038326Method and Apparatus for Compensating for B1 Inhomogeneity in Magnetic Resonance Imaging by Nonselective Tailored RF Pulses - A method of exciting nuclear spins in a body, the method comprising the steps of: (a) immerging said body (PB) in a static magnetic field (B02-14-2013
20130038327METHOD TO ACQUIRE A MAGNETIC RESONANCE IMAGE DATA SET OF A TARGET VOLUME - In a method to acquire a magnetic resonance image data set of a target volume with a magnetic resonance device, wherein the target volume is composed of a number of sub-volumes defined in a two-dimensional plane orthogonal to the readout direction, for each sub-volume, in order to acquire a partial data set of a sub-volume, a targeted excitation of the sub-volume and a data acquisition from that sub-volume to measure the partial data set take place by radiation of a first radio-frequency pulse acting in a first direction of the plane and radiation of a second radio-frequency pulse acting in a second direction that is orthogonal to the first direction. The partial data sets are combined into the magnetic resonance data set.02-14-2013
20130038328MAGNETIC RESONANCE IMAGING APPARATUS AND GRADIENT COIL COOLING CONTROL METHOD - A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.02-14-2013
20100127703TAILORED RADIOFREQUENCY PULSES FOR UNIFORM SATURATION IN MAGNETIC RESONANCE IMAGING - Embodiments of the present disclosure are directed to systems and methods for providing tailored RF pulse trains, based on estimated B0 and B1 profiles, for uniform saturation for MRI techniques. The tailored pulse trains are optimized to minimize residual longitudinal magnetization in target tissue. The B0 and B1 profiles can be measured a priori over a desired region of a patient, e.g., the heart, and can overcome or mitigate SAR and B1 inhomogeneity constraints. In exemplary embodiments, the tailored pulse trains can include hard pulses with unequal weighting. In other embodiments, the tailored pulse trains can include BIR-4 pulse trains that are optimized to minimize residual longitudinal magnetization in target tissue. The tailored pulse train designs can improve the immunity to B1 variation while maintaining low RF power. MRI systems, methods, and controllers for providing tailored pulse trains are described.05-27-2010
20100109665FAST VELOCITY MEASUREMENTS USING BALANCED SSFP MAGNETIC RESONANCE IMAGING - Referenceless techniques for flow imaging are described that exploit a refocusing property of balanced steady state free precession (“SSFP”) magnetic resonance imaging (“MRI”), and achieve up to approximately a 50% reduction in total scan time. With the echo time set to one half of the sequence repetition time (TE=TR/2), non-flow-related image phase tends to vary smoothly across the field-of-view, and can be estimated from static tissue regions to produce a phase reference for nearby voxels containing flowing blood. These approaches produce accurate in vivo one-dimensional velocity estimates in half the scan time compared with conventional balanced SSFP phase-contrast methods. The feasibility of referenceless time-resolved 3D flow imaging (called “7D” flow) is demonstrated for a carotid bifurcation application from just three acquisitions. Related systems are also described. Other attributes such as blood acceleration can also be imaged with such techniques.05-06-2010
20090212774ANTENNA ARRANGEMENT FOR A MAGNETIC RESONANCE APPARATUS - In an antenna arrangement for a magnetic resonance apparatus and a method for acquiring magnetic resonance signals, which has at least four individually operable antenna conductor loops arranged like a matrix in rows and columns, wherein two antenna conductor loops adjacent in a row or in a column are inductively decoupled from one another; and wherein two antenna conductor loops diagonally adjacent to one another in adjacent rows and columns are capacitively decoupled from one another.08-27-2009
20090021254Methods for Arbitrary Shape Selective Excitation Summed Spectroscopy and Applications of Same - In another aspect, the present invention relates to a method for NMR measurements of an arbitrarily shaped region of interest of a living subject. In one embodiment, the method comprises the steps of applying a broad bandwidth of RF pulses to the arbitrarily shaped region of interest to obtain a corresponding spectrum, wherein substantially entire range of chemical shifts in the spectrum is excited from the arbitrarily shaped region of interest, interleaving a plurality of radial k-lines in radial k-space per excitation with non-selective refocusing pulses and obtaining spatial localization for the spectrum of the arbitrarily shaped region of interest.01-22-2009
20100066365METHODS FOR FAT SIGNAL SUPPRESSION IN MAGNETIC RESONANCE IMAGING - The present invention is directed to methods for chemical species signal suppression in magnetic resonance imaging procedures, wherein Dixon techniques are enhanced by continuously sampling techniques. In the invention, k-space data is acquired during the entire period of read gradient associated with a gradient echo pulse acquisition scheme. The invention utilizes a total sampling time (TST) acquisition during the entire read gradient, using three echoes of a TST data set to achieve chemical species separation in both homogenous fields as well as areas of field inhomogeneity. As an example, a continuously sampled rectilinearly FLASH pulse sequence is modified such that the time between echoes was configured to be 2.2 milliseconds, with TE selected to allow 180° phase variation in the fat magnetization between each of the three TE's (TE03-18-2010
20130049753MAGNETIC RESONANCE IMAGING APPARATUS - The present invention provides an image processing technique which enables various contrast control, by quantitatively handling a degree of phase enhancement in a contrast control as a post-processing of the image reconstruction. A complex operation is performed on each pixel value of a complex image obtained by an MRI, thereby generating an image with desired contrast. Intensity is controlled by increasing or decreasing the argument of the pixel value of each pixel by a constant amount, and the degree of phase enhancement is controlled by multiplying the phase (argument) of each pixel by a constant.02-28-2013
20130049752SAMPLING PATTERN FOR ITERATIVE MAGNETIC RESONANCE IMAGE RECONSTRUCTION - In a method to generate magnetic resonance (MR) images of an examination subject, MR signals are detected simultaneously with multiple coils, each coil having its own coil characteristic. In the detection of the MR signals, raw data space is incompletely filled with MR signals; with raw data space being undersampled in a central raw data region with a coherent acquisition pattern that is composed of a spatially repeating set of raw data points; and raw data space outside of the central raw data region is sampled with an incoherent acquisition pattern. The MR image is reconstructed from the detected MR signals, step-by-step in an iterative reconstruction procedure using a reconstruction matrix A, starting from an initial estimate; wherein the reconstruction matrix has continuing information about the coil characteristics with which the MR signals were detected.02-28-2013
20130088229Magnetic Resonance Examination with Instrument Detection - An magnetic resonance examination system for examination of an object comprises an RF system to generate an RF transmission field and gradient system to generate temporary magnet gradient fields. A control module includes a sequence controller to control the RF system and the gradient system to produce acquisition sequences including RF pulses and magnetic gradient pulses to generate magnetic resonance signals. The sequence controller is configured to produce an detection scan including a steady state gradient echo acquisition sequence to generate steady state gradient echo signals and an RF spoiled echo acquisition sequence to produce RF spoiled echo signals. The control module further including an analysis unit to compare the gradient echo signals to the RF spoiled echo signals and for detection of an instrument in the object from the comparison of the gradient echoes and the RF spoiled echoes.04-11-2013
20130088230METHOD OF RECONSTRUCTING A MAGNETIC RESONANCE IMAGE OF AN OBJECT CONSIDERING HIGHER-ORDER DYNAMIC FIELDS - The invention relates to a method of acquiring a magnetic resonance image of an object employing spatial encoding by a gradient field, said gradient field comprising non-linear gradient field components, the method comprising: selecting (04-11-2013
20130088226MRI WITH FAT SUPPRESSION USING FAT DECOUPLING RF DURING PRE-SEQUENCE SHIMMING - A magnetic resonance imaging (MRI) system and method uses an MRI gantry having a static magnet structure, controllable gradient magnet structures and at least one radio frequency (RF) coil for transmitting and receiving RF signals to and from an imaging volume. Control circuits are configured to control gradient magnetic fields generated by the gradient magnet structures, to transmit/receive RF signals to and from the at least one RF coil and to process RF signals received during a diagnostic MRI scan to produce displayable images of structures located within the imaging volume. The control circuits are configured to include a preparatory fat decoupling RF pulse as part of a patient ROI (region of interest) shimming sequence effected prior to a fat suppression type of diagnostic MRI data acquisition scan sequence.04-11-2013
20130088227MAGNETIC RESONANCE-BASED METHOD AND SYSTEM FOR DETERMINATION OF OXYGEN SATURATION IN FLOWING BLOOD - A method and system for determination of oxygen saturation in blood flowing in a vessel using magnetic resonance (MR). An MR image sequence is acquired with different echo time (TE) encoding, and different Fourier velocity encoding (FVE). A Fourier transformation is applied along the velocity dimension to determine a velocity distribution of tissue signals in each voxel of the image sequence. Tissue signals indicative of moving tissues are separated from tissue signals indicative of static tissue, based on the velocity distribution. Oxygen saturation in blood may then be determined using only the tissue signals indicative of flowing blood.04-11-2013
20130069650MAGNETIC RESONANCE IMAGING APPARATUS AND HIGH-FREQUENCY MAGNETIC FIELD PULSE MODULATION METHOD - Degradation of the slice excitation characteristics is prevented by making it possible to modulate a high frequency magnetic field pulse on the basis of a gradient magnetic field response that is actually used. In order to do so, an imaging pulse sequence including first and second measurement sequences is executed. In the first measurement sequence, the same slice selection gradient magnetic field pulse as a slice selection gradient magnetic field pulse used in the second measurement sequence is used. The phase of a magnetic resonance signal measured by the first measurement sequence is differentiated, and the waveform of the high frequency magnetic field pulse is calculated using the result. In the second measurement sequence, a high frequency magnetic field pulse with the calculated waveform is applied together with the slice selection gradient magnetic field pulse, and a magnetic resonance signal for an image is measured.03-21-2013
20130069645CHARACTERIZATION OF N-GLYCAN MIXTURES BY NUCLEAR MAGNETIC RESONANCE - The present disclosure provides nuclear magnetic resonance (NMR) methods for characterizing mixtures of N-linked glycans. Without limitation, methods of the present disclosure may be useful in characterizing monosaccharide composition, branching, fucosylation, sulfation, phosphorylation, sialylation linkages, presence of impurities and/or efficiency of a labeling procedure (e.g., labeling with a fluorophore such as 2-AB). In certain embodiments, the methods can be used quantitatively. In certain embodiments, the methods can be combined with enzymatic digestion to further characterize glycan mixtures.03-21-2013
20130069646METHOD FOR THE COMPARATIVE ANALYSIS OF PROTEIN PREPARATIONS BY MEANS OF NUCLEAR MAGNETIC RESONANCE - The invention relates to a method for the comparative analysis and control of the quality of a protein preparation by means of nuclear magnetic resonance (NMR) spectrometry. This method can be used to compare three-dimensional protein conformations in different protein preparations without requiring the samples to undergo any particular preparation. In particular, the method can be used to determine if a selected protein is in the same three-dimensional conformation in different protein preparations, if it is degraded in the formulation or if it is interacting with some of the excipients present. Specifically, the method can be used for the analysis and control of the quality of therapeutic compounds, particularly biodrugs or biosimilars, in different samples, without altering said samples.03-21-2013
20130069649MAGNETIZATION TRANSFER AND OFF-RESONANCE PROTOCOLS IN NMR - A method includes acquiring a signal intensity from a spin system after applying the radio frequency preparation pulses prior to the imaging readout or spectroscopic localization, and acquiring signal intensity starting with magnetization initially rotated to a certain angle by applying an initial pulse before the preparation scheme, and processing the data to generate an image or spectra corresponding to the spin system. The imaging or spectroscopy sequence is configured to provide data based on magnetization transfer or an off-resonance effect.03-21-2013
20130069648METHOD AND MAGNETIC RESONANCE SCANNER FOR HYPERINTENSE DISPLAY OF AREAS IN THE VICINITY OF DIPOLE FIELDS - In a method and magnetic resonance apparatus for the hyperintense display of areas containing particles of magnetically active substances, in an examination region in a measurement volume of a magnetic resonance scanner, measurement data from the examination area are generated by a pulse sequence and recorded, the pulse sequence causing an echo time of less than one millisecond, so that a suppression of undesired signals is also caused.03-21-2013
20130069647TARGETED TRAVELLING WAVE MRI - A travelling wave MRI apparatus is provided that includes a coaxial waveguide arrangement, a cavity for placing therein a subject or object to be imaged, a device for applying a static magnetic field, a device for applying gradient magnetic fields, a device for coupling in electromagnetic excitation pulses having a predetermined operating frequency to induce nuclear magnetic resonance within the subject or object, and a device for detecting an electromagnetic signal resulting from the magnetic resonance. The coaxial waveguide arrangement placed in the cavity of the apparatus comprises a first and a second conductive member arranged in a coaxial arrangement with respect to one another, wherein the first conductive member is formed by a continuous tubular outer member and the second conductive member is formed by a tubular shaped inner member, which is divided in axial direction defining an investigation area.03-21-2013
20100134106Method for acquiring and displaying medical image data - A method is disclosed for acquiring and displaying image data, in particular MR image data. In at least one embodiment, the method includes scanning an examination object by way of a magnetic resonance imaging scanner and generating first (MR) image data of the examination object, wherein scanning parameters during the scan are selected such that the regions of interest in the scanned examination object have high image data values, and the regions which are not of interest in the examination object have, relative thereto, low image data values in the first MR image data; generating a mask on the basis of the first image data by means of which mask regions in the first MR image data which have the low image data values can be hidden; scanning the examination object by way of a medical imaging system and generating second image data of the examination object; applying the mask to the first and/or second image data; and displaying the first and/or second image data processed by the mask.06-03-2010
20100134104NUCLEAR MAGNETIC RESONANCE MEASUREMENT TECHNIQUES IN NON-UNIFORM FIELDS - Methods and pulse sequences for facilitating nuclear magnetic resonance (NMR) measurements in grossly inhomogeneous fields. Methods and pulse sequences according to the invention may be used to accurately measure variables such as transverse relaxation time, longitudinal relaxation time, and diffusion, without the need for data at long recovery time, thereby allowing for faster measurements. In addition, methods and pulse sequences according to embodiment of the invention may allow simultaneous encoding of information in both the amplitude and the shape of echoes, so as to allow a single-shot measurement of multiple variables, e.g., both transverse relaxation time (from the decay of echo amplitudes) and longitudinal relaxation time (from the echo shape). CPMG detection may be used to overcome the often limited signal-to-noise ratio in grossly inhomogeneous fields.06-03-2010
20130088228METHOD AND APPARATUS FOR MAGNETIC RESONANCE IMAGING - In a method and apparatus for magnetic resonance (MR) imaging, a magnetization of nuclear spins in a subject is prepared in multiple preparation modules of an acquisition sequence. MR signals are acquired with at least one imaging module of the sequence. Spoiler gradient fields are generated in the multiple preparation modules in order to affect a transverse magnetization of the spins. The spoiler gradient fields that are applied in at least two different preparation modules are spatially varied along different directions. Spoiler gradient moments of the spoiler gradient fields are selected so that, for at least one of three orthogonal spatial directions, a weighted sum of the spoiler gradient moments that are applied along this spatial direction satisfies a threshold condition.04-11-2013
20090302844Regenerative expansion apparatus, pulse tube cryogenic cooler, magnetic resonance imaging apparatus, nuclear magnetic resonance apparatus, superconducting quantum interference device flux meter, and magnetic shielding method of the regenerative expansion apparatus - A regenerative expansion apparatus includes a regenerative tube configured to regenerate cryogenic cooling at the time of expansion of a coolant gas; a cylinder in communication with a low temperature end of the regenerative tube, the cylinder being configured to generate the cryogenic cooling by repeating compression and expansion of the coolant gas via the regenerative tube; a magnetic cold storage material filling inside the regenerative tube, the magnetic cold storage material being made of a magnetic material, the magnetic cold storage material being configured to come in contact with the coolant gas so that the cryogenic cooling is regenerated; and a magnetic shield member surrounding the magnetic cold storage material; wherein the magnetic shield member has an electric resistivity equal to or less than 50 μΩcm at a normal temperature.12-10-2009
20090302843SYSTEM FOR MEASURING A MAGNETIC RESONANCE SIGNAL BASED ON A HYBRID SUPERCONDUCTIVE-MAGNETORESISTIVE SENSOR - The system for measuring a magnetic resonance signal within a sample (12-10-2009
20090302840METHOD AND APPARATUS FOR CONTRAST INFLOW DYNAMIC MR ANGIOGRAPHY - A system and method for MR imaging includes a computer programmed to determine first and second view-ordering sequences. The first and second view-ordering sequences comprise values corresponding to respective views of first and second k-space data sets, respectively, wherein the values corresponding to a central view of each the first and second k-space data sets are positioned such that acquisition of k-space data in each central view is acquired from a first and second anatomical region, respectively, as a contrast agent passes therethrough. The positions of the values corresponding to the central views of the first and second k-space data sets within the respective sequences are different. The computer is further programmed to acquire MR data according to the first and second view-ordering sequences over a series of cardiac cycles to fill data in the first and second k-space data sets, respectively.12-10-2009
20090302842BIRADICAL POLARIZING AGENTS FOR DYNAMIC NUCLEAR POLARIZATION - The present invention provides methods for performing dynamic nuclear polarization using biradicals with a structure of formula (I) as described herein. In general, the methods involve (a) providing a frozen sample in a magnetic field, wherein the frozen sample includes a biradical of formula (I) and an analyte with at least one spin half nucleus; (b) polarizing the at least one spin half nucleus of the analyte by irradiating the frozen sample with radiation having a frequency that excites electron spin transitions in the biradical; (c) optionally melting the sample to produce a molten sample; and (d) detecting nuclear spin transitions in the at least one spin half nucleus of the analyte in the frozen or molten sample. The present invention also provides biradicals with a structure of formula (I) with the proviso that Q12-10-2009
20130057282METHOD AND MAGNETIC RESONANCE SYSTEM FOR IMAGING A PARTIAL REGION OF AN EXAMINATION SUBJECT - In a method and magnetic resonance (MR) apparatus to image a partial region of an examination subject by means of a multislice measurement, which partial region includes at least two measurement slices, and is located at least in part at the edge of a field of view of the magnetic resonance apparatus, for each voxel to be optimized that is located at the edge of the field of view, a gradient field is configured for each measurement slice of the partial region that is to be measured and is used to acquire magnetic resonance data in the multislice measurement. The gradient field is configured so as to cause a nonlinearity of the gradient field and a B03-07-2013
20130057281Magnetic Resonance System and Method for Slice-Selective Detection and Correction of Incorrect Magnetic Resonance Image Data in Slice Multiplexing Measurement Sequences - In a magnetic resonance (MR) method system for slice-selective detection and correction of incorrect magnetic resonance data, a first acquisition sequence is implemented to acquire MR data from a first slice of the examination subject that is associated with a chronologically first coherence curve of the magnetization; a second acquisition sequence is implemented to acquire MR data from a second slice of the examination subject that is associated with a chronologically second coherence curve of the magnetization. In slice multiplexing measurement sequences that are characterized by the simultaneous use of the transverse magnetization of the first and second slice within the first and second acquisition sequences slice-selective errors can be detected and corrections made.03-07-2013
20130057279Noninvasive Characterization of Mechanical Properties of Materials and Tissues Using Magnetic Resonance Techniques - Techniques include determining, non-invasively and without applying deformational stress, a nuclear magnetic resonance relaxation rate at a volume inside a subject. The method also includes determining a mechanical property of material at the volume inside the subject based on the nuclear magnetic resonance relaxation rate.03-07-2013
20130057280Magnetic Resonance System and Method for Rephasing Spin Systems in Slices in Slice Multiplexing Measurement Sequences for Magnetic Resonance Imaging - In a method for rephasing a first spin system in a first slice with a first coherence curve and a second spin system of a second slice with a second coherence curve, in the generation of MR images with slice multiplexing, a first RF pulse deflects the spin system of the first slice and a second RF pulse deflects the spin system of the second slice. The beginning of the second RF pulse is time-shifted with respect to the beginning of the first RF pulse by a time period that is shorter than the duration of the first RF pulse. A rephasing correction impresses a correction phase on at least one of the spin systems, and signals of the spin systems are respectively detected. The coherence curves are rephased so detection of the signals occurs simultaneously.03-07-2013
20130057278LOCAL COIL WITH OPTIMIZED DATA TRANSMISSION - A local coil for magnetic resonance applications receives analog magnetic resonance signals excited by an excitation signal in an examination object using a plurality of receive antennas. The local coil digitizes the received analog magnetic resonance signals and stores the digitized magnetic resonance signals in digital form in a write-in sequence in an internal local coil memory. The local coil reads the digitized magnetic resonance signals stored in the internal local coil memory out of the internal local coil memory in a read-out sequence that is different from the write-in sequence and transfers the digitized magnetic resonance signals to a control and evaluation device of a magnetic resonance unit.03-07-2013
20130069644METHOD OF CONTROLLING AN MRI SYSTEM AND AN APPARATUS THEREFOR - A magnetic resonance imaging (MRI) system includes a radio frequency (RF) coil which receives timing information about a pulse sequence and stores the timing information in a memory of the RF coil. Then, when an RF excitation signal is transmitted, the RF coil performs decoupling. When a magnetic resonance (MR) echo signal is generated, the RF coil receives the MR echo signal and transmits the MR echo signal to a central controlling apparatus through a wireless channel. When a transmission error arises, the RF coil retransmits corresponding data in an idle time when the RF excitation signal is not transmitted or the MR echo signal is not generated. Thus, the RF coil is prevented from being damaged by the RF excitation signal and prevents the quality of an MR image from deteriorating compared to a synchronization-type communication method.03-21-2013
20100127702SYSTEM FOR ADJUSTING A MAGNETIC FIELD FOR MR AND OTHER USE - An MR magnetic field inhomogeneity compensation system acquires multiple MR data sets representing luminance intensity values of individual image elements comprising corresponding multiple different image versions of at least a portion of a first imaging slice of patient anatomy including fat and water components. The compensation system employs the multiple MR data sets in solving corresponding multiple simultaneous nonlinear equations to calculate local frequency offset associated with magnetic field inhomogeneity at the individual image element location, for an individual image element of the image elements. The local frequency offset comprises a difference between proton spin frequency at the location and a nominal proton spin frequency. The compensation system derives data representing an electrical signal to be applied to magnetic field generation coils to substantially compensate for determined offset frequencies at the plurality of individual locations. A magnetic field generation coil generates a magnetic field in response to applying the electrical signal to substantially compensate for the magnetic field inhomogeneity at the individual image element location.05-27-2010
20090267602SYSTEM AND METHOD FOR ACCELERATED MR IMAGING - A system and method for accelerated MR imaging includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly comprising at least one RF transmit coil and comprising multiple coils to acquire MR images. The MRI apparatus also has a computer programmed to excite multiple pencil regions by use of an under-sampled echo-planar excitation trajectory and acquire MR signals simultaneously on multiple channels of the RF coil assembly. The computer is also programmed to separate contributions from the various multiple pencil regions by use of parallel imaging reconstruction.10-29-2009
20090267604MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a data acquisition unit and an image data generating unit. The data acquisition unit acquires MR signals for imaging by an imaging scan with applying a frequency-selective or slice-selective radio frequency intermediate pulse for controlling a contrast and a spoiler gradient magnetic field for suppressing unnecessary signal component after applying al least one of radio frequency excitation pulses. The image data generating unit generates image data based on the magnetic resonance signals.10-29-2009
20090267603System and method for synthesizing crossing ADC distributions via reassembly of multiple k-spaces - A method for synthesizing crossing ADC distributions via reassembly of multiple k-spaces is disclosed. The method includes the steps of scanning a test object having a plurality of anisotropic structures to acquire a first set of DTI data using gradient directions; rotating the gradient directions by an angle α; repeating the step of scanning the test object to acquire a second set of DTI data; creating a composite data set from the first and second sets of data; and applying an inverse Fourier transform to the composite data set.10-29-2009
20090267601RF RECEIVE COIL ASSEMBLY WITH INDIVIDUAL DIGITIZERS AND MEANS FOR SYNCHRONIZATION THEREOF - The invention relates to a device (10-29-2009
20120223712APPARATUS AND METHOD FOR MAGNETIC RESONANCE MEASUREMENT AND MAPPING OF ELECTRICAL IMPEDANCE, COMPLEX PERMITTIVITY AND COMPLEX CONDUCTIVITY AS APPLIED TO DETECTION AND EVALUATION OF SAMPLE PATHOLOGY - A method of measurement of or mapping the distribution of complex permittivity, complex conductivity, complex impedance, or electric loss angle during magnetic resonance imaging or analysis. The method includes applying a time-varying electric field of a Faraday shield to a sample and cross-correlating the line spectrum signal so produced with the voltage applied to the Faraday shield in a detection circuit. The method permits non-contrast magnetic resonance screening for breast cancer in vivo and/or continuous measurement of electrical characteristics of materials at variable frequencies in vitro. A system of detecting and evaluating sample pathology includes a Faraday shield device that includes parallel electrodes oriented orthogonal to the static magnetic field of a MRI device to produce a time varying electric field. A detector is coupled to the MRI device to detect at least one of a complex permittivity, a complex conductivity, and an electrical impedance of the sample.09-06-2012
20120223711APPARATUS AND METHOD FOR DECREASING BIO-EFFECTS OF MAGNETIC GRADIENT FIELD GRADIENTS - An apparatus and a method for increasing the magnitude of the magnetic gradient for MRI without causing nerve stimulation. As an example, the short ramp time of magnetic gradients, for example less than 150 microseconds is contemplated. These short ramp-time magnetic gradients are used for the imaging of structures with short relaxations times, such as teeth, without causing nerve stimulation. The apparatus comprises a generator of magnetic gradients of at least 1 milliTeslas in magnitude with at least one gradient ramp time shorter than 150 microseconds and which induces no peripheral nerve stimulation.09-06-2012
20120223710Method of generating 2D or 3D maps of MRI T1 and T2 relaxation times - A method of generating 2D or 3D maps of MRI T09-06-2012
20120223709SIMULTANEOUS TX-RX FOR MRI SYSTEMS AND OTHER ANTENNA DEVICES - Apparatus and method that are more efficient and flexible, and obtain and connect high-power RF transmit signals (TX) to RF-coil devices in an MR machine or other devices and simultaneously receive signals (RX) and separate net receive signals NRX) of interest by subtracting or filtering to remove the subtractable portion of the transmit signal (STX) from the RX and preamplifying the NRX and signal processing the preamplified NRX. In some embodiments, signal processing further removes artifacts of the transmitted signal, e.g., by digitizing the NRX signal, storing the digitized NRX signal in a memory, and performing digital signal processing. In some embodiments, the present invention also includes pre-distorting the TX signals in order to be better able to identify and/or remove the remaining artifacts of the transmitted signal from the NRX signal. This solution also applies to other high-power RF-transmit-antennae signals.09-06-2012
20110012597FASTENER-LESS EDGE LAUNCH CONNECTOR FOR MR-COMPATIBLE MEDICAL MONITORING - A robust MR compatible ECG monitor (01-20-2011
20110012596Magnetic Resonance System and Method To Detect and Confirm Analytes - A system and method are provided to detect target analytes based on magnetic resonance measurements. Magnetic structures produce distinct magnetic field regions having a size comparable to the analyte. When the analyte is bound in those regions, magnetic resonance signals from the sample are changed, leading to detection of the analyte.01-20-2011
20110012595METHOD AND MAGNETIC RESONANCE SYSTEM TO DETERMINE THE STRENGTH OF A MAGNETIC INTERFERENCE FIELD - In a method and magnetic resonance system to determine the strength of a magnetic interference field that is caused by an interference object in a magnetic resonance image data acquisition, the interference object having a magnetic susceptibility that differs from the magnetic susceptibility of the material that surrounds the interference object image data acquired with the imaging magnetic resonance measurement that depict an examination subject that contains the interference object are made available in a form that allows the determination of at least one geometric variable of an image artifact in the image data that was caused by the magnetic interference field. The strength of the magnetic interference field that is caused by the interference object is then determined on the basis of the determined geometric variable of the image artifact.01-20-2011
20110012594POSITION DETECTING SYSTEM AND POSITION DETECTING METHOD - A system includes a body-insertable apparatus disposed while introduced in a subject in a detection space, and an external apparatus disposed on the outside of the subject. The body-insertable apparatus includes a first switch for connecting/interrupting a resonance circuit and an oscillation circuit or a ground line. The external apparatus includes a drive coil driving unit for outputting a drive signal having the resonance frequency; a drive coil for generating the drive magnetic field in the detection space in accordance with the drive signal; and a second switch for connecting/interrupting the drive coil driving unit and the drive coil. The second switch connects the drive coil driving unit and the drive coil when the first switch is off, and disconnects them when the first switch is on. The resonance circuit generates the resonance magnetic field in accordance with the induction signal or the drive magnetic field.01-20-2011
20130063144MAGNETIC RESONANCE METHOD AND APPARATUS TO REDUCE ARTIFACTS IN DIFFUSION-WEIGHTED IMAGING - In a method and system for diffusion-weighted acquisition of MR signals with an image acquisition sequence that has multiple diffusion coding gradients and readout gradients to read out the MR signals, MR signal portions are generated with a desired signal coherence path and MR signal portions are generated with unwanted signal coherence paths, with predominantly the MR signal portions with the desired signal coherence path being acquired by the readout gradients by activating dephasing gradients that reduce the acquisition of MR signal portions with unwanted coherence paths. The dephasing gradients are determined under consideration of the diffusion gradients that are used and under consideration of the unwanted signal coherence paths, so that each has a dephasing gradient moment for each unwanted signal coherence path that is greater than a threshold.03-14-2013
20130063147DECOUPLING OF MULTIPLE CHANNELS OF AN MRI RF COIL ARRAY - A radio-frequency coil assembly (03-14-2013
20130063146SYSTEM AND METHOD FOR CONTROLLING CALIBRATION AND DELAY PHASES OF PARALLEL, CONTRAST-ENHANCED MAGNETIC RESONANCE IMAGING - A system and method for performing parallel magnetic resonance angiography includes controlling operation of a magnetic gradient system and an RF system to perform a calibration data pulse sequence to begin acquiring calibration data for use in a parallel imaging reconstruction process after receiving an indication that the subject has received a dose of a contrast agent. The acquisition of the calibration data is discontinued before the contrast agent reaches a peak concentration within a region of interest (ROI) of the subject and operation of the magnetic gradient system and RF system is controlled to perform an imaging pulse sequence in accordance with a parallel imaging acquisition to begin acquiring image data from the ROI. The image data is reconstructed into an image of the ROI using the calibration data.03-14-2013
20130063145APPARATUS, SYSTEMS AND METHODS FOR FACILITATING SIGNAL EXCITATION AND/OR RECEPTION IN A MAGNETIC RESONANCE SYSTEM - In accordance with certain exemplary embodiments of the present disclosure, provided herein are apparatus, systems and methods for, e.g., faciliatating signal excitation and/or reception in a magnetic resonance system, such as, e.g., a system configured for magnetic resonance imaging (MRI) and/or spectroscopy. For example, exemplary embodiments of a method for traveling wave imaging in an MRI system can include, e.g., a circular conductive structure lying in a transverse plane within the scanner bore. The exemplary structure can be concentric with the center of the scanner RF shield. The structure can be arranged to have a resonant mode at the MR frequency characterized by a current pattern which can be configured to excite and receive an exemplary waveguide mode. The exemplary current pattern can be further configured to facilitate traveling wave imaging, for example.03-14-2013
20090256563PREPARING THE MAGNETIZATION STATE OF A SAMPLE FOR ALTERNATING REPETITION TIME STEADY STATE FREE PRECESSION MAGNETIC RESONANCE IMAGING - Techniques and systems for magnetic resonance imaging. In one aspect, preparatory pulse sequences precede alternating repetition time steady state free precession (ATR SSFP) pulse sequences to enable image acquisition before reaching a steady-state equilibrium. The design of the preparatory sequences is based on a two step process: First an oscillatory residue is expressed in terms of a window (e.g., a Kaiser-Bessel window) and scale parameters. Second the oscillatory residue is minimized to determine the scale parameters according to a desired application (e.g. ATR SSFP, optimized for fat, water, etc.) The preparation scheme described in this specification can be applied to arbitrary repetition times and RF phase cycling combinations.10-15-2009
20090237078METHODS OF EVALUATING PEPTIDE MIXTURES - The presently disclosed subject matter provides methods for evaluating and characterizing peptides, peptide mixtures, and polypeptide mixtures. More particularly, the presently disclosed subject matter provides methods for evaluating or characterizing complex peptide or polypeptide mixtures comprising glutamic acid, alanine, tyrosine, and lysine, e.g., Copolymer-1 or glatiramer acetate, including, but not limited to, methods of identifying, isolating, quantifying, and purifying amino acids, peptides, polypeptides, and combinations thereof having a diethylamide group instead of a carboxyl group present on the C-terminus. The presently disclosed methods can be used to determine the mole percent of polypeptides having a diethylamide group at a C-terminus thereof and can be used to evaluate one or more properties of a sample of one polypeptide mixture as compared to one or more properties of a different sample of a polypeptide mixture.09-24-2009
20090302841Surface Coil Arrays for Simultaneous Reception and Transmission with a Volume Coil and Uses Thereof - This invention provides arrays of counter rotating current surface coils for simultaneous reception and transmission with a volume coil for improved signal-to-noise ratio and radio frequency field homogeneity for in particular high-field (4-8 T) imaging of deep body regions, such as central brain structures.12-10-2009
20100085049METHOD OF OBTAINING A MAGNETIC RESONANCE IMAGE IN WHICH THE STREAK ARTIFACTS ARE CORRECTED USING NON-LINEAR PHASE CORRECTION - A non-linear phase correction method is provided. For the non-linear phase correction method, image information is acquired by gradient echo echo planar imaging (EPI). Reference information is acquired by spin echo EPI. The image information is corrected based on the reference information.04-08-2010
20120235684METHOD TO DETERMINE THE ACTUAL FLIP ANGLE AND METHOD TO ADJUST THE TRANSMITTER VOLTAGE IN A MAGNETIC RESONANCE APPARATUS - In a method to determine the actual flip angle in magnetic resonance tomography with continuous table feed, at least one echo signal is generated by a pulse sequence from which an actual flip angle is produced with at least one RF pulse of the sequence, and a gradient scheme is used in the direction of the continuous travel of the examination subject, the gradient scheme being designed such that its first moment disappears at the points in time of each echo signals used for the determination of the flip angle. Such a pulse sequence is also used in a method for adjustment of the transmitter voltage for RF pulses given continuous travel of the examination subject in a magnetic resonance apparatus.09-20-2012
20120235683MAGNETIC RESONANCE METHOD AND SYSTEM TO DETECT INTERFERENCE SIGNALS IN MAGNETIC RESONANCE SPECTROSCOPY SIGNALS - In a method and device to detect interference signals in magnetic resonance spectroscopy signals a comparison signal is computationally reconstructed that optimally approximates a measured, detected magnetic resonance spectroscopy signal. The comparison signal forms spectral components of resonance lines of the measured magnetic resonance spectroscopy signal. A residual is calculated from the difference of the two signals (comparison signal and magnetic resonance spectroscopy signal) in the frequency representation. The interference signals are determined from the residual.09-20-2012
20120235682METHOD AND APPARATUS FOR ACQUIRING MAGNETIC RESONANCE IMAGING SIGNALS - A method for acquiring MRI signals includes: applying one or more than one RF pulse, which carries at least two frequency components, and a slice/slab selection gradient to a subject, so that at least two slices/slabs of the subject respectively corresponding to the at least two frequency components are excited simultaneously; applying a plurality of spatial encoding gradients; applying a plurality of separation gradients for separating the at least two slices/slabs; and applying at least one coherent refocusing gradient between the plurality of separation gradients.09-20-2012
20130162250SYSTEM AND METHOD TO REDUCE POWER LOSS IN A GRADIENT AMPLIFIER - A gradient amplifier system, includes: a power stage comprising a plurality of bridge amplifiers, each operates at a first switching frequency; a gradient coil coupled to the power stage and configured to produce a magnetic field proportional to a coil current signal supplied by the power stage; a controller stage coupled to an input terminal of the power stage and configured to: generate a pulse width modulated gate signal based on the coil current signal and a reference current signal, wherein the pulse width modulated gate signal is generated at a second switching frequency when a slew rate associated with the reference current signal is below a threshold rate for at least a first time period; and apply the pulse width modulated gate signal to the power stage for changing an operating frequency of each of the plurality of bridge amplifiers from the first to the second switching frequency.06-27-2013
20130162251PARALLEL MAGNETIC RESONANCE IMAGING METHOD FOR RADIAL TRAJECTORY - A parallel imaging (PI) method has been frequently used as a method for shortening an image acquisition time in the MRI field. The PI technique is a method for acquiring data using multi-channel coils, that is, several coils, when acquiring the data in MRI. According to this technique, data, the amount of which is smaller than that when the data is obtained using only one coil, is acquired, and then an image is obtained using coil information. According to an embodiment, a new image reconstruction method is proposed which adopts an expectation maximization (EM) technique that is different from the existing GRAPPA or SENSE technique when an image is obtained using PI data acquired through the radial trajectory.06-27-2013
20120112745MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - In a non-Cartesian sampling method, a trajectory along which a measurement space is sampled is optimized. That is, data placed on one spiral trajectory heading outward from the center of the measurement space is sampled from a plurality of echo signals. The sampling is performed such that the data is placed continuously, without overlapping, in order from the center to the outside. Alternatively, the data may be overlapped and a mismatch between echo signals may be corrected using the data of the overlapped portion.05-10-2012
20120112744MICROCOIL MAGNETIC RESONANCE DETECTORS - The present invention provides microcoil magnetic resonance based modules, detection devices, and methods for their use.05-10-2012
20120112743T2-weighted and diffusion-weighted imaging using fast acquisition with double echo (FADE) - A method of acquiring T2-weighted and diffusion-weighted images is provided. The method includes acquiring a first image and a second image in a single magnetic resonance imaging (MRI) scan, where the first image and the second image have different echo times (TE). The single MRI scan includes a series of repeated RF excitation pulses, where the echo signal for the first image and the echo signal for the second image are acquired between a pair of RF excitation pulses. A spoiler gradient is disposed to provide a first diffusion weighting to the first image and a second diffusion weighting to the second image, where the first image and the second image have different T2 weightings and different diffusion weightings.05-10-2012
20100271024NMR IMAGING SYSTEM WITH REDUCED CRYOGENIC LOSSES AND REDUCED ACOUSTIC NOISE - The magnetic resonance imaging system includes an exterior cryogenic enclosure containing a device for creating an intense main magnetic field in a usable interior space in the form of a tunnel, a radio-frequency excitation device, a set of solenoid gradient windings placed in a cylindrical annular space around the interior space and electronic control circuits. The toroidal cryogenic enclosure includes concentrically a vacuum enclosure defining an interior cylindrical space at room temperature in which the set of solenoid gradient windings is placed, at least one thermal screen maintained at a temperature in the range 20 K to 80 K, a cold box at a temperature less than 5 K, and a former for supporting the device for creating an intense main magnetic field. Furthermore, to reduce acoustic noise and cryogenic losses, at least one additional envelope is placed between the set of solenoid gradient windings and the vacuum enclosure, the additional envelope being made of a conductive material having electrical resistivity greater than or equal to 7×1010-28-2010
20100231216Segmenting infarct in diffusion-weighted imaging volume09-16-2010
20120293171PULSED ASL USING TAGGING PULSE PATTERN ENCODING/DECODING OF FLOWING NUCLEI COHORTS - Magnetic resonance imaging (MRI) produces an image representative of flowing nuclei within a subject. For each of plural MRI data acquisition sequences, a non-contrast pulsed ASL (arterial spin labeling) pre-sequence is applied to flowing nuclei in a tagging region during a tagging period (that occurs prior to MRI data acquisition from a selected downstream image region). The ASL pre-sequence includes plural different elapsed tagging times at which a radio frequency (RF) nuclear magnetic resonant (NMR) nutation tagging pulse occurs or does not occur in accordance with different predetermined patterns for corresponding different data acquisition sequences. Acquired MRI data is decoded in accordance with such predetermined patterns to detect MRI signals emanating from different cohorts of flowing nuclei that have been subjected to different combinations of nutation pulses. Acquired MRI data is used to reconstruct at least one image representing flowing nuclei within the selected image region.11-22-2012
20110068790Method for Magnetic Resonance Imaging - A method of magnetic resonance imaging based on rapid acquisition by sequential excitation and refocusing is provided. The method comprises turning on a first time-encoding gradient and applying an excitation pulse in the presence of the first time-encoding gradient. The excitation pulse excites magnetization sequentially along one spatial axis. Thereafter, a first refocusing pulse is applied. A second time-encoding gradient is turned on followed by a second refocusing pulse. A third time-encoding gradient is turned on and a signal is acquired in the presence of the third time-encoding gradient. The third time-encoding gradient sums to zero with the first time-encoding gradient and the second time-encoding gradient for sequential points in space.03-24-2011
20100259259Systems and methods for tuning properties of nanoparticles - Systems and methods for imaging include preparing a ferrofluid including magnetic nanoparticles (MNPs) in a liquid carrier, positioning the ferrofluid in a field region of a magnetic resonance imaging (MRI) system, and actuating a spin velocity or linear velocity of the magnetic nanoparticles to alter the scalar or tensor complex magnetic susceptibility (CMS) of the ferrofluid. Additional activation magnetic field generating apparatus can tune the magnetic field to change particle spin velocity or linear velocity. The method provides, inter alia, for using the spinning MNPs to: heat or cool a region of interest; acquire an improved image of the nanoparticles within a region of interest; alter local effective viscosity, diffusion coefficient, magnetic field, and/or other electromagnetic and/or physicochemical properties; cause local mixing; and enhance diffusion in drug delivery. Parallel methods with dielectric nanoparticles and electric fields are also disclosed.10-14-2010
20090189606MAGNETIC RESONANCE DIAGNOSIS APPARATUS, NOISE SPATIAL DISTRIBUTION GENERATING METHOD, AND SIGNAL ACQUISITION METHOD - A magnetic resonance diagnosis apparatus includes a coil assembly including a high-frequency coil, a transmission unit which excites magnetization of a specific atomic nucleus of an object via the high-frequency coil, a reception unit including a detection unit for receiving a magnetic resonance signal via the high-frequency coil, a low-pass filter, and an analog/digital converter, a control unit which sets a passband of the low-pass filter to not less than three odd multiple of a frequency band determined from an imaging field of view, and sets a sampling frequency of the analog/digital converter to an oversampling frequency exceeding a signal band of the magnetic resonance signal, a noise spatial distribution generating unit which generates a noise spatial distribution on the basis of an output from the reception unit.07-30-2009
20110279118CONTROLLING MULTI-CHANNEL TRANSMITTER EFFECTS ON SPECIFIC ABSORPTION RATE - Systems, methods, and other embodiments associated with controlling the specific absorption rate (SAR) in a patient associated with a conductor are described. The conductor may be, for example, a wire associated with a pacemaker, a wire associated with a neurostimulator, an orthopaedic device, and so on. One example method includes calibrating a multi-channel transmitter associated with a magnetic resonance imaging (MRI) apparatus imaging the patient. The example method also includes controlling the MRI apparatus to transmit radio frequency (RF) energy to image the patient in a manner where the RF energy will only influence the SAR near the conductor in the patient less than a desired threshold amount.11-17-2011
20120169339MAGNETIC RESONANCE IMAGING APPARATUS AND GRADIENT MAGNETIC FIELD APPLICATION METHOD - In order to obtain the rephasing effect based on a GMN method while reducing the load on the hardware of an MRI apparatus and an object according to the imaging parameter setting value that an operator wants, when it is difficult to apply a rephasing gradient magnetic field of a predetermined order according to the imaging parameter value set as input, a rephasing gradient magnetic field of a smaller amount of application is calculated, and at least some echo signals are measured using the calculated rephasing gradient magnetic field of the smaller amount of application. As the rephasing gradient magnetic field of the smaller amount of application, a rephasing gradient magnetic field with a lower order than the predetermined order is used or a rephasing gradient magnetic field for asymmetric measurement is used. Alternatively, a rephasing gradient magnetic field is applied only in a desired phase encoding range.07-05-2012
20100277171NOVEL METHOD AND APPARATUS FOR MRI SIGNAL EXCITATION AND RECEPTION USING NON-RESONANCE RF METHOD (NORM) - A system for MR signal excitation and reception and method which uses a non-resonant device or transmission line to perform MR imaging and spectroscopy. The system with non-resonant device is advantageous to parallel imaging due to the improved decoupling performance. Because the non-resonant RF coil is not generally sensitive to frequency, a MR system with the non-resonant RF coil is capable of multinuclear MR operation at varied magnetic field strength. The system comprises a non-resonant RF coil for connecting to an MR system, the conductor being configured to have a characteristic impedance matched to the MR system. The RF coil is configured to produce electromagnetic fields of differing strengths based on the constant characteristic impedance maintained in the system for exciting and receiving MR signals.11-04-2010
20120187946METHOD AND MRI DEVICE TO DETECT A DIRECTION OF AT LEAST ONE FIBER IN A BODY - The invention concerns a method to extract a diffusion direction from DW-MR signals, in which a magnetic held gradient q07-26-2012
20090309595MAGNETIC RESONANCE IMAGING METHOD AND APPARATUS - In an imaging according to the step moving method, a slice imaging condition with respect to each station is optimized, thereby enabling an efficient imaging. A controller of an MRI apparatus displays positioning frames 12-17-2009
20090295387Shear Wave Generation System For Medical Imaging - A system is configured to produce a stress on a subject while performing a magnetic resonance elastography scan in a magnetic resonance imaging (MRI) system. The system includes an active driver operable to produce an energy configured for a magnetic resonance elastography (MRE) process. A passive actuator is configured to be positioned in the MRI system and to be coupled to the subject. The system includes a tube coupling the active driver to the passive actuator to deliver the energy produced by the active driver to the passive actuator, and a strap coupled to the passive actuator. The strap is configured to be disposed around the subject. The strap includes a substantially inelastic material configured to convert the energy delivered to the passive actuator from the tube into shear waves with the subject for use in the MRE process.12-03-2009
20120286781Magnetic Resonance Methodology for Imaging of Exchange-Relayed Intramolecular Nuclear Overhauser Enhancement Effects in Mobile Solutes - An embodiment in accordance with the present invention provides a method for imaging exchange-relayed intramolecular Nuclear Overhauser Enhancement (NOE) effects with Magnetic Resonance (MR) in mobile solutes. In the method, non-exchangeable protons or other magnetic nuclei with resonances of a finite linewidth in the NMR proton spectrum within a species or subject can be labeled magnetically using radiofrequency. Intramolecular NOE effects can then transfer the label between the non-exchangeable nuclei and non-exchangeable and exchangeable protons in the same molecule during a magnetic steady state. The water signal is monitored to observe a reduction in the water signal due to the transfer of NOE labels to the water signal in a manner relayed through the exchangeable protons. Analysis can also be performed to produce an image or spectrum of the subject.11-15-2012
20120286780MAGNETIC RESONANCE RELAXATION ALONG A FICTITIOUS FIELD - A system includes a driving module, a processor, and a readout module. The driving module is configured to apply a perturbation to a sample. The processor is configured to define a plurality of different rotating frames relative to the perturbation, wherein each frame has a corresponding fictitious field. The readout module is coupled to the processor and is configured to generate an output based on relaxation of the sample as a function of the perturbation.11-15-2012
20090206837INTERVENTIONAL MRI MAGNETIC FIELD GENERATOR BASED ON PERMANENT MAGNETS - A magnet assembly primarily for use in MRI Interventional applications having an array of four mam permanent magnets that are spaced-apart and arranged into a ring-like geometry with six easy-access openings The magnetization direction in each permanent magnet is anti-parallel to any other adjacent permanent magnet in the πng assembly while it is parallel to any other permanent magnet in the array that is oppositely located just as in a quadrupolar system Such an arrangement has the advantage of concentrating the magnetic field inside the nng enclosure while minimizing magnetic field generated outside Together, these four spatially spaced-apart permanent magnets create a very homogeneous and strong magnetic field in the central enclosure with two orthogonal access paths and one parallel access path to the enclosure Through one access pathway a patient can be inserted while through the other pathways a doctor can fully access the patient.08-20-2009
20100171498MAGNETIC RESONANCE METHOD AND APPARATUS TO REDUCE DISTORTIONS IN DIFFUSION IMAGING - In a method and magnetic resonance (MR) system for correction of image distortions that occur in acquisitions of diffusion-weighted MR images of an examination subject a first adjustment measurement with a first diffusion weighting is implemented, a second adjustment measurement with a second diffusion weighting is implemented and correction parameters to de-skew diffusion-weighted MR images are automatically calculated in a computer on the basis of the two adjustment measurements. One of the two adjustment measurements is implemented with a predetermined diffusion weighting in three orthogonal diffusion directions, and correction parameters are determined for the three orthogonal diffusion directions.07-08-2010
20110291653MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus according to an embodiment includes an executing unit, a calculating unit, and a correcting unit. The executing unit executes a first pre-scan in which a readout gradient magnetic field and a phase encoding gradient magnetic field are not applied and sampling gradient magnetic fields is applied in a phase encoding direction and a second pre-scan in which the readout gradient magnetic field is not applied, the sampling gradient magnetic field is applied at the same echo signal as that in the first pre-scan, and a representative phase encoding gradient magnetic field in a main scan. The calculating unit calculates the amount of correction from phase differences between the echo signals collected by the first pre-scan and between the echo signals collected by the second pre-scan. The correcting unit corrects the pulse sequence for the main scan on the basis of the calculated amount of correction.12-01-2011
20120098537High Resolution Nuclear Magnet Resonance with Unknown Spatiotemporal Variations of the Static Magnetic Field - The invention relates to nuclear magnetic resonance spectroscopy (NMR). NMR experiments are usually carried out in homogeneous magnetic fields. In many cases however, the inherent heterogeneity of the samples or living organisms under investigation, and the poor homogeneity of the magnets (particularly when bulky samples must be placed outside their bores), make it virtually impossible to obtain high-resolution spectra. Unstable power supplies and vibrations arising from cooling can lead to field fluctuations in time as well as space. Here it is shown how high-resolution NMR spectra can be obtained in inhomogeneous fields with unknown spatiotemporal variations. The method of the invention, based on coherence transfer between spins, can accommodate spatial inhomogeneities of at least 11 G/cm and temporal fluctuations slower than 2 Hz.04-26-2012
20120098536RADIO FREQUENCY MAGNETIC RESONANCE IMAGING COIL FOR INCREASED QUANTA GATHERING - A radio frequency (RF) magnetic resonance imaging (MRI) coil for increased quanta gathering is described. An apparatus may comprise an RF receiver coil comprising multiple coil windings. Each coil winding may comprise a compressed cylindrical tube having a defined thickness to form a surface to collect a first quanta of emitted energy. Adjacent coil windings may be spaced apart a defined distance to form coil gaps to allow a second quanta of emitted energy to pass through the coil gaps. Other embodiments are described and claimed.04-26-2012
20110298458MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus according to an embodiment includes a sequence control unit that controls a gradient magnetic field power supply, thereby performing a pulse sequence including the application of a continuous readout gradient magnetic field pulse. The sequence control unit controls the gradient magnetic field power supply such that the slew rate of the gradient magnetic field pulse is reduced in stages as the output voltage of a gradient magnetic field amplifier is reduced in stages.12-08-2011
20100090698NUCLEAR MAGNETIC RESONANCE METHOD FOR DETECTING HYDROGEN PEROXIDE AND APPARATUS FOR PERFORMING SAID METHOD - A nuclear magnetic resonance (NMR) method for detecting hydrogen peroxide includes providing a liquid sample in a static magnetic field; stimulating a spin signal in the sample by exciting the sample with a first electromagnetic pulse having a frequency corresponding to the hydrogen NMR frequency in the static magnetic field; waiting for a first time period; refocusing the spin signal in the sample for a first number of times by a series of second electromagnetic pulses having a frequency corresponding to the hydrogen NMR frequency in the static magnetic field, said second electromagnetic pulses being separated by a first echo time, while sampling a first train of spin signals in between the second electromagnetic pulses; and refocusing the spin signal in the sample for a second number of times by a series of third electromagnetic pulses having a frequency corresponding to the hydrogen frequency in the static magnetic field, said third electromagnetic pulses being separated by a second echo time while sampling a second train of spin signals in between the third electromagnetic pulses, wherein the second echo time is different from the first echo time. A first spin-spin relaxation time is derived from the first train of spin signals and a second spin-spin relaxation time is derived from the second train of spin signals, and the presence of hydrogen peroxide is signaled if the quotient of the first spin-spin relaxation time to the second spin-spin relaxation time is different from one.04-15-2010
20100264923System for Improved MR Image Reconstruction - A system for parallel image processing in MR imaging uses multiple MR imaging RF coils to individually receive MR imaging data representing a slice of patient anatomy. An MR imaging system uses the multiple RF coils to acquire corresponding multiple image data sets of the slice. A coil selection processor determines a prioritized ranking of the multiple RF coils by ranking individual coils of the multiple RF coils based on correlation with remaining coils of the multiple RF coils. The correlation being determined by determining degree of correlation of image data sets acquired by respective coils of the multiple RF coils. The coil selection processor selects a subset of the multiple RF coils using the ranking. An image generator generates a composite MR image using image data sets provided by the selected subset of the multiple RF coils excluding image data sets provide by remaining coils of the multiple RF coils.10-21-2010
20110006769MAGNETIC RESONANCE IMAGING APPARATUS AND SHIMMING APPARATUS - According to one embodiment, a magnetic resonance imaging apparatus includes a static magnetic-field generating unit, a gradient magnetic-field generating unit, a plurality of metal shim plates in a plate shape, and a shim holding unit. The metal shim plates adjust uniformity of the static magnetic field. The shim holding unit holds the metal shim plates in a layered state. Each of the metal shim plates includes a convex having a certain angle at a certain position, and the metal shim plates are layered such that the convex of each one metal shim plate comes into contact with a back of the bent convex of another metal shim plate.01-13-2011
20100141254Perfusion Adaptive MR Image Data Processing System - A system adaptively processes MR image data to accommodate variation in perfusion time of a vessel fluid. An MR image data acquisition device initiates acquisition of a first image set comprising multiple different individual images having a set of corresponding different physical slice locations through a patient anatomical volume and being acquired at a corresponding first set of times and in a first order relative to a time of blood tagging of a patient. The MR image data acquisition device initiates acquisition of a second image set comprising multiple different individual images having the set of corresponding different physical slice locations through the patient anatomical volume and being acquired at substantially the corresponding first set of times and in a second order, different to the first order, relative to the time of blood tagging of the patient. At least one computer combines and averages image data representing the same corresponding image slice in both the first and second image sets and acquired at different times relative to the time of blood tagging of the patient and sends the combined and averaged image data representing the same corresponding image slice to a destination.06-10-2010
20080309336CALIBRATING pMRI WITH CARTESIAN CONTINUOUS SAMPLING - Example systems, methods, and apparatus control a pMRI apparatus to produce a pulse sequence having an extended acquisition window, and overlapping phase-encoding gradients and read gradients. One example method controls a pMRI apparatus to produce a trajectory having Cartesian and radial segments that sample in a manner that satisfies the Nyquist criterion in at least one region of a volume to be imaged. The pMRI apparatus is controlled to apply radio frequency energy to the volume according to the pulse sequence and following the trajectory and to acquire MR signal from the volume in response to the application of the RF energy. The MR signal includes a first component associated with the Cartesian segment of the trajectory and a second component associated with the radial segment of the trajectory. The example method includes calibrating a reconstruction process using Nyquist-satisfying data from the second component.12-18-2008
20100033179DISTORTION-FREE MAGNETIC RESONANCE IMAGING NEAR METALLIC IMPLANTS - A method for 3D magnetic resonance imaging (MRI) with slice-direction distortion correction is provided. One or more selective cross-sections with a thickness along a first axis is excited using a RF pulse with a bandwidth, wherein a selective cross-section is either a selective slice or selective slab. A refocusing pulse is applied to form a spin echo. One or more 2D encoded image signals are acquired with readout along a second axis and phase encoding along a third axis. Slice-direction distortion is corrected by resolving the position by resolving the frequency offset.02-11-2010
20100033181Levitating MEMS Resonator for Magnetic Resonance Force Microscopy - A self-stabilized, levitating MEMS (Micro Electro-Mechanical Systems) resonator is provided for detection of magnetic resonance spectra of electrons and nuclei in magnetic resonance force microscopy (MRFM) measurements. The present MRFM system includes a levitating micro-disk having electrically-controlled force sensitivity. To achieve imaging on the scale of a single nuclear spin, the force sensitivity of the measurement must be on the order of 1 aN (atto-Newton) or less. For about a 1 aN force to produce deflections comparable to an angstrom for interferometer detection, the stiffness or spring constant (k) of the resonator will typically be less than 1 μN/m (micro-Newtons per meter). Since the resonator is to be driven with an oscillating force at its resonance, there is a quality-factor (Q) enhancement of the amplitude of the motion. As a result, the k/Q ratio is preferably less than 1×1002-11-2010
20090273345Method for determining the spatial distribution of magnetic resonance signals with use of local spatially encoding magnetic fields - A method for determining the spatial distribution of magnetic resonance (MR) signals from an imaging region within MSEM regions of a local gradient system, wherein, in a preparatory step, a spatial encoding scheme is defined; in an execution step, nuclear spins are repeatedly excited with RF pulses, and thereafter spatially encoded according to the spatial encoding scheme, in at least one dimension by means of the local gradient system, and MR signals are acquired, from which the spatial distribution is calculated, visualized and/or stored,11-05-2009
20090289632APPARATUS FOR APPLICATION OF A MAGNETIC FIELD TO A SAMPLE - Disclosed is an apparatus for application of a magnetic field to a sample, in particular an elongated sample. At least in places, the apparatus has magnetic bodies which are arranged such that they can rotate with respect to one another and have, and leave open, a common access opening for the sample. In particular, this allows the apparatus to be applied to an elongated sample whose ends are not accessible. As a result of the bodies being arranged such that they can rotate with respect to one another, the magnetic fields of the bodies can be adjusted with respect to one another before the apparatus is opened and closed, so as to minimize the magnetic field in the common access opening. In consequence, only small magnetic interaction forces need be overcome during opening and closing.11-26-2009
20110215805MRI and method using multi-slice imaging - An MRI for a patient includes an imaging coil for sparsely sampling multiple slices of k-space data across a spatial dimension and a temporal dimension to produce associated signals. The MRI includes a receiving coil which receives the associated signals of the multiple slices. The MRI includes a memory in which the associated signals of the multiple slices are stored. The MRI includes a processing unit which processes the associated signals of the multiple slices altogether at essentially a same time to produce an image of the patient. A method of using an MRI for a patient. A method of using an MRI for a patient's heart.09-08-2011
20100026296MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus enabling highly precise spectrum measurement even when resonance frequency changes during MRS or MRSI measurement is provided.02-04-2010
20120187947SLICE SELECTIVE MRI EXCITATION WITH REDUCED POWER DEPOSITION USING MULTIPLE TRANSMIT CHANNELS - Described are embodiments for slice-selective excitation for MRI that utilize multiple RF transmit coils, each of which are driven with a separate independent current waveform. These embodiments allow slice-selective excitation with slice profile and excitation time similar to other single-channel excitation, but with reduction in SAR caused by the transverse component of the RF field by a factor up to the number of excitation coils.07-26-2012
20120268123RELAXOMETRY QUANTIFICATION SELF-JUSTIFICATION FITTING - Apparatus, methods, and other embodiments associated with self-justification fitting for magnetic resonance imaging (MRI) relaxation parameter quantification are described. One example nuclear magnetic resonance (NMR) apparatus includes a self-justification fitting logic configured to selectively include and exclude data points from a set of data points associated with NMR signals based, at least in part, on their impact on a fit attribute (e.g., standard deviation). In one embodiment, the self-justification is configured to select a subset of data points from the set of data points as a function of values for a fit attribute computed from fitting at least two different subsets of data points from the set of data points to a known NMR signal evolution.10-25-2012
20100283464MAGNETIC RESONANCE IMAGING USING NAVIGATOR ECHO METHOD WITH NAVIGATOR REGION IN OVERLAP WITH IMAGED REGION - An object of this invention is to provide a Navigator Echo method applicable even when an elongated navigator region and a region of interest to be imaged have a mutually overlapping part. A control section of an MRI apparatus decides, based on a measured signal obtained from a first reception pulse emanated in response to a first transmission pulse which excites a first region to monitor the breathing movement of a subject, whether or not a second region of the subject to be imaged and the first region have a mutually overlapping part, corrects, when the decision result shows that there is an overlapping part, the measured signal obtained from the first reception pulse, and controls a reconstruction unit so as to reconstruct the image of the second region based on the measured signal obtained from a second reception pulse emanated in response to a second transmission pulse which excites the second region and the corrected measured signal.11-11-2010
20090153139Methods and Apparatus for Compensating Field Inhomogeneities in Magnetic Resonance Studies - One aspect of the present disclosure relates to a method or determining location(s) at which at least one magnetic article is to be positioned during a magnetic resonance imaging procedure of at least one subject. A magnetic field Bo is applied to a region that includes the at least one subject and does not include the at least one magnetic article. First magnetic resonance information about the region in response to the applied magnetic field BO is received. The first magnetic resonance information relates at least in part to one or more magnetic field inhomogeneities in the region. Based at least in part on the first magnetic resonance information, at least one first location proximate the at least one subject at which at least one paramagnetic article and/or diamagnetic article is to be positioned is determined, so as to at least partially compensate for the one or more magnetic field inhomogeneities.06-18-2009
20090146659METHOD AND DEVICE FOR AUTOMATIC DETERMINATION OF SLICE POSITIONS IN AN MR EXAMINATION - Two method and device embodiments allow automatic determination of slice positions in an MR examination in an MR system. In the first embodiment, a volume to be measured by the MR examination is predetermined. The MR examination is subsequently planned in that at least one of the parameters slice direction, slice interval, slice thickness, number of slices for the MR examination is adapted such that an extent in the slice direction of the MR examination essentially corresponds to the predetermined volume. In the second embodiment, at least one volume segment is predetermined. Multiple slices for the MR examination are subsequently determined such that each volume segment is contained in at least one of the slices.06-11-2009
20110080170MRI NON-CONTRAST TIME-SLIP ANGIOGRAPHY USING VARIABLY POSITIONED CINE SUB-SEQUENCE - A magnetic resonance imaging (MRI) system using an MRI gantry and controlling computer system includes at least one programmed computer configured to effect a cardiac-triggered time-SLIP (spatial labeling inversion pulse) MRI data acquisition sequence for imaging blood perfusion in imaged patient tissue and employing therewithin an MRI cine sub-sequence. The sub-sequence is positioned in the time domain to encompass at least part of a predetermined (e.g., diastolic) cardiac time interval of the patient. Processing acquired data from the time-SLIP data acquisition sequence generates a sequence of MRI cine frame images having respectively associated different effective BBTI (black blood time to inversion) time intervals. Identifying one of the MRI cine frame images as acceptable, thereby effectively also determines an appropriate BBTI time interval for the patient. The system then outputs a time-SLIP image based on the determined appropriate BBTI time interval to at least one of (a) a display, (b) a remote system or (c) a non-transitory storage medium.04-07-2011
20110080166Parallel-Accelerated Complex Subtraction MRI - A method for producing background-suppressed MR images with improved resistance to subject motion and noise, particularly that associated with parallel imaging techniques. An MRI system is employed to acquire two sets of undersampled k-space data under different scan conditions. A differential k-space data set is then formed by complex, pairwise subtraction of the two undersampled k-space data sets and a background-suppressed MR is reconstructed from the differential k-space data set using an accelerated reconstruction technique, such as GRAPPA.04-07-2011
20090146658Microcoil Magnetic Resonance Detectors - The present invention provides microcoil magnetic resonance based modules, detection devices, and methods for their use.06-11-2009
20090085566MAGNETIC RESONANCE IMAGING APPARATUS AND ANALYSIS METHOD FOR FAT SUPPRESSION EFFECT IN MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus includes an imaging unit which performs imaging more than once with respect to an imaging target while changing a central frequency of a fat suppression pulse, a generation unit which generates a plurality of images based on magnetic resonance signals obtained by imaging performed more than once, and a calculation unit which calculates factor information of spatial inhomogeneity of a fat suppression effect based on the plurality of images.04-02-2009
20080265883MRI Method for Reducing Artifacts Using RF Pulse at Offset Frequency - A method for magnetic resonance imaging includes performing a preparatory stage of a MR pulse sequence with an MRI system in which a non-selective RF preparatory pulse is used having a bandwidth such that any spin species having corresponding Larmor frequencies within that bandwidth are affected and the bandwidth is centered at a selected frequency which is offset from a nominal Larmor frequency of the desired spin species being imaged. A time period (TI) elapses during which longitudinal spin magnetization recovers; and then an imaging stage is performed in which an RF excitation pulse is generated to produce transverse spin magnetization of the desired spin species, and in which a set of NMR signals are acquired. An image is reconstructed using the acquired set of NMR signals, and the reconstructed image has reduced artifacts due to B10-30-2008
20090309594MAGNETIC RESONANCE IMAGING METHOD AND APPARATUS USING A CIRCULARLY POLARIZED RF RESONATOR DETECTING RIGHT AND LEFT CIRCULARLY POLARIZED COMPONENTS OF MR SIGNALS - In an MR imaging method and apparatus which MR images with improved signal intensity, improved signal-noise ratio, improved contrast and improved image homogeneity can be acquired, the polarization state of the magnetic field of the RF pulses radiated into the measurement subject and of the resonance signals emitted by the measurement subject are distorted by the interaction with electrically-active materials of the measurement subject. In the transmission branch of the RF system the RF pulses emitted by a transmission coil are pre-distorted with regard to their polarization state. The sensitivity of the reception branch is optimized such that it is capable of detecting resonance signals independent of their polarization state.12-17-2009
20100085051METHOD AND DEVICE TO DETERMINE AN INVERSION TIME VALUE OF TISSUE BY MEANS OF MAGNETIC RESONANCE TECHNOLOGY - In a method to determine an inversion time value for contrast improvement between different tissue in a contrast agent-supported magnetic resonance imaging, a series of magnetic resonance images of an imaging area is acquired using an inversion recovery sequence with different inversion times. A structure in the magnetic resonance images is segmented and a time response of the signal intensity of image elements corresponding to one another in the magnetic resonance images of the segmented structure is automatically determined. Minima of the signal intensity in the segmented structure are determined automatically and associated with the associated inversion time values. The optimal inversion time value for contrast improvement is automatically determined from the inversion time values that have been associated with the minima of the signal intensity in the segmented structure.04-08-2010
20080204017MRI APPARATUS - An MRI apparatus has a gantry, a bed and a lighting unit collective including a plurality of lighting units. The gantry accommodates a static field magnet configured to generate a static field, a gradient coil configured to generate a gradient magnetic field, and an RF coil configured to transmit or receive an RF pulse as well as having an opening into which a person is inserted. The bed has a removable table-top for an inside and an outside of the opening. The lighting unit group is disposed at at least one of an inside position of the opening and an outside position from which an inside of the opening can be lighted so that the lighting units can carry out lighting such that an amount of emitting light increases bit by bit from a bedside to a counter bedside opposite to the bedside across the opening.08-28-2008
20100090696METHOD, PROCESSOR, AND MAGNETIC RESONANCE APPARATUS FOR SELECTIVE PRESENTATION OF LUNG MOVEMENT - In a method for selective presentation of a movement of the lung, magnetic resonance images (MR images) of the lung are acquired in a temporal progression, i.e. MR images of the lung are acquired over multiple breathing cycles. The acquired MR images are registered with regard to a reference position and the signal curve over time is determined in the acquired MR images. The frequency spectrum of the determined signal curves is then determined, such as by a Fourier transformation. A specific frequency spectrum is filtered with a frequency band filter, wherein the frequency range of the frequency band filter is adapted to the movement to be shown. The filtered frequency spectrum is transformed back into a filtered signal curve of the MR images, and the magnetic resonance images obtained via this back-transformation are displayed in the temporal progression with the filtered signal curve. A computer readable medium, an image processing unit and a magnetic resonance apparatus implement such a method.04-15-2010
20110148410Method for data acquisition acceleration in magnetic resonance imaging (MRI) using receiver coil arrays and non-linear phase distributions - A method for accelerating data acquisition in MRI with N-dimensional spatial encoding has a first method step in which a transverse magnetization within an imaged object volume is prepared having a non-linear phase distribution. Primary spatial encoding is thereby effected through application of switched magnetic fields. Two or more RF receivers are used to simultaneously record MR signals originating from the imaged object volume, wherein, for each RF receiver, an N-dimensional data matrix is recorded which is undersampled by a factor R06-23-2011
20090206838Systems and Methods for Correction of Inhomogeneities in Magnetic Resonance Images - Intensity inhomogeneities can obscure areas of interest and are problematic for MR image segmentation algorithms. An efficient approach to estimating these inhomogeneities by computing a calibration factor that is a function of an estimated bias field from a series of calibration scans is disclosed. This enables correction of T08-20-2009
20100090697METHOD OF PERFORMING MRI WITH AN ATOMIC MAGNETOMETER - A method and apparatus are provided for performing an in-situ magnetic resonance imaging of an object. The method includes the steps of providing an atomic magnetometer, coupling a magnetic field generated by magnetically resonating samples of the object through a flux transformer to the atomic magnetometer and measuring a magnetic resonance of the atomic magnetometer.04-15-2010
20100085052METHOD FOR MAGNITUDE CONSTRAINED PHASE CONTRAST MAGNETIC RESONANCE IMAGING - A method for magnitude constrained phase contrast magnetic resonance imaging (MRI) is provided. The method utilizes an assumption that the image magnitude is shared across a series of images reconstructed from a set of phase contrast enhanced k-space data. In this manner, one common magnitude image and a plurality of phase images are reconstructed substantially contemporaneously from the acquired image data. The method is further applicable to other phase contrast MRI methods, such as phase contract velocimetry. Moreover, simultaneous phase contrast velocimetry and chemical shift imaging, in which water and fat signal separation is achieved, is provided.04-08-2010
20090140736METHOD AND INSTRUMENT OF LOCALLY MEASURING PROTIC SOLVENT CONTENT IN SAMPLES - Excitation-use high frequency RF generated by an RF oscillator 06-04-2009
20110169490MAGNETIC RESONANCE IMAGING APPARATUS - A Magnetic Resonance Imaging (MRI) apparatus according to an embodiment can execute a plurality of kinds of protocols varying in image contrast, and includes a storage unit and an output unit. The storage unit stores imaging conditions about the plurality of kinds of protocols. The output unit outputs onto a display unit an edit screen for receiving edit of a parameter that is an element of the imaging conditions. The edit screen is output by being separated into a common part that receives edit of parameter common to a plurality of kinds of protocols varying in image contrast, and an individual part that individually receives edit of parameter with respect to each protocol.07-14-2011
20090140737Nmr Machine Comprising Solenoid Gradient Coils - The nuclear magnetic resonance machine comprises a device (06-04-2009
20090128146DIRECTED-ENERGY IMAGING SYSTEM - An imaging system that uses a directed-energy device can include a directed-energy device configured to generate an excitation signal to impinge a region of interest of a target and excite elements therein and receive resonance signals emitted from the region of interest of the target after the excitation signal is terminated. The directed-energy device can include a charged particle generator configured to generate plural energized particles and a charge transformer configured to receive the plural energized particles that include charged particles from the charged particle generator and to output a wavefront including energized particles that include particles having substantially zero charge. The imaging system can also include plural gradient coils positioned about a bore of a magnet and configured to impress a polarizing magnetic field on a target and a communications interface.05-21-2009
20090278538METHOD AND APPARATUS FOR SIMULTANEOUSLY ACQUIRING MULTIPLE SLICES/SLABS IN MAGNETIC RESONANCE SYSTEM - Provided is a method for simultaneously acquiring magnetic resonance slices/slabs of a subject. The method comprises steps as follows. First, apply one or more than one RF pulse, which carries at least two frequency components, and a slice/slab selection magnetic field gradient so that at least two slices/slabs of the subject respectively corresponding to the at least two frequency components are excited simultaneously. Second, apply a spatial encoding magnetic field gradient. Third, apply a slice/slab separation magnetic field gradient so as to separate the at least two slices/slabs. The method according to the present invention can be used to acquire data for simultaneously reconstructing multiple slices/slabs. The method is compatible with existing MRI systems.11-12-2009
20090189605SYSTEM AND METHOD FOR TISSUE SPECIFIC MR IMAGING OF METABOLITES USING SPECTRAL-SPATIALLY FORMED STIMULATED ECHO - A system for magnetic resonance (MR) spectroscopy includes a plurality of gradient coils positioned about a bore of a magnet and an RF coil assembly coupled to a pulse generator to emit RF pulse sequences and arranged to receive resulting MR signals from a subject of interest. A system control is also included in the MR spectroscopy system and is coupled to the plurality of gradient coils and the RF coil assembly. The system control is programmed to cause the RF coil assembly to emit a first RF pulse and a second RF pulse, wherein at least one of the first and second RF pulses is spectrally selective and at least one of the first and second RF pulses is spatially selective. The system control is also programmed to cause the RF coil assembly to emit a third RF pulse after a pre-defined time delay to generate a stimulated echo and detect MR signals resulting from the stimulated echo.07-30-2009
20110199084METHOD AND SYSTEM FOR DIFFUSION TENSOR IMAGING - Methods and systems for displaying microstructural integrity and/or connectivity of a region of interest (ROI) in a patient are disclosed. Methods and systems for tissue segmentation and atlas-based tissue segmentation in ROI of a patient using diffusion MRI data are also described. A method for studying microstructural integrity and/or connectivity of a region of interest (ROI) in a patient includes acquiring, via an imaging system, diffusion magnetic resonance (MRI) data in the ROI by using an Icosahedral Diffusion Tensor Encoding Scheme (IDTES); computing, via the imaging system, mean diffusivity (MD) and fractional anisotropy (FA) by using logarithm-moment algorithm (LMA); and displaying, on a display, the microstructural integrity and/or connectivity of ROI based on the computed MD and FA. The diffusion MRI data includes diffusion-weighted imaging (DWI) data or diffusion tensor imaging (DTI) data. In some cases, displaying the microstructural integrity and/or connectivity of ROI takes place in real time.08-18-2011
20090278535Magnetic resonance imaging apparatus and method - In performing the moving table imaging, an MRI apparatus and a method thereof are provided, which minimizes image degradation and reduces imaging time. When an image of a wide range of a test object is taken, the imaging is repeated while changing the gradient magnetic field intensity in a phase-encode direction, as well as changing the size of field of view FOV in the readout direction by changing the readout gradient magnetic field intensity in reading out the data, according to the phase-encode amount. In a part where the FOV is expanded, data acquisition frequency is lowered, and consequently, the total imaging time is reduced. The data sampling time may be changed along with the change of the FOV, and therefore, a process for achieving a unique matrix size in the readout direction is rendered unnecessary, and a spatial resolution can be maintained.11-12-2009
20120194184METHOD AND SYSTEM FOR DESIGNING EXCITATION PULSES FOR MAGNETIC RESONANCE IMAGING - Methods and systems for designing excitation pulses for magnetic resonance imaging are provided. One method includes parameterizing spin-domain rotation parameters to define parameterized variables and defining a constrained optimization problem based on the parameterized variables. The method also includes solving the constrained optimization problem and generating parameters for the RF pulses based on the solved problem, wherein the RF pulses are one of multidimensional RF pulses on non-constant gradient trajectories or one dimensional RF pulses on non-constant gradient trajectories.08-02-2012
20120194187System for Suppression of Artifacts in MR Imaging - An MR system acquires, over multiple heart cycles, image datasets representing multiple image slices of an anatomical region of interest of a patient. In the device, an RF signal generator and a magnetic field gradient generator provides an RF pulse and magnetic field gradient sequence for RF signal excitation of the region of interest and for acquiring RF data following the signal excitation. The sequence comprises, a first sequence occurring substantially immediately after the acquisition of image data using a readout magnetic field gradient. The first sequence includes an RF pulse with a predetermined flip angle followed by a magnetic field gradient pulse for reducing field magnetization to substantially zero. The first sequence is preceded by a dummy acquisition sequence comprising the elements of the first sequence except substantially without acquisition of data.08-02-2012
20090289631MAGNETIC RESONANCE IMAGING WITH MULTIPLE CONTRAST - A magnetic resonance imaging system comprises an RF-excitation module to generate one of several RF-excitations and a gradient module to generate one of several magnetic gradient pulses, a control unit controls the RF-excitation module and the gradient module and performs an acquisition sequence containing a succession of RF-excitations and gradient pulses. The acquisition sequence comprising several acquisition segments in which magnetic resonance signals are generated, in respective segments different contrast types occur. Individual acquisition segments have one or several repetitive acquisition units, magnetic resonance signals in an individual acquisition unit pertaining to the same contrast type. This approach of acquisition of different contrast type per group of acquisition segments allows optimisation of the acquisition of each of the contrast type independently of the contrast type of other groups of acquisition segments.11-26-2009
20090295386POSITION DETECTION SYSTEM - A position detection system that does not require calibration measurement to be performed in advance and reduces the work required for detecting a position and so on is provided. The provided position detection system includes a device having a magnetic inductance coil; a drive coil that has a position-calculating frequency near a resonant frequency of the magnetic inductance coil and generates an alternating magnetic field which acts on the magnetic inductance coil; a plurality of magnetic-field sensors that is disposed outside the operating range of the device and detects an induced magnetic field generated by the magnetic inductance coil; amplitude-component detection section for detecting amplitude components whose phase is substantially orthogonal to the alternating magnetic field from the outputs of the magnetic sensors acquired by the plurality of magnetic sensors; and position analyzing section for calculating at least one of a position and an orientation of the device on the basis of the amplitude components.12-03-2009
20090102479MRI Phase Visualization of Interventional Devices - Imaging a device in a magnetic resonance imaging system includes inserting a device having a conductive coil assembly thereon into a subject, obtaining a magnetic resonance image of the subject that includes signal phase variations, determining a position of the device based on discontinuities in the signal phase variations, and displaying an image representation of the device superimposed on a reference image based upon the determined position.04-23-2009
20090102480SHIMMING OF ELECTRIC FIELD FOR ELECTRIC PROPERTIES TOMOGRAPHY - A radio frequency coil system (04-23-2009
20090261827MITIGATING SATURATION ARTIFACTS ASSOCIATED WITH INTERSECTING PLANE TRUEFISP ACQUISITIONS THROUGH GROUPED REVERSE CENTRIC PHASE ENCODING - Systems methods, and other embodiments associated with acquiring intersecting TrueFISP images using grouped reverse centric phase encoding are described. One example method includes controlling an MRI apparatus to produce a TrueFISP sequence that delays acquisition of the center of k-space to reduce saturation banding artifacts. The example method also includes controlling the MRI apparatus to produce a TrueFISP sequence that reduces eddy current artifacts by grouping (e.g., pairing) lines in k-space. The method concludes by acquiring NMR signal in response to the TrueFISP sequence.10-22-2009
20090261826Low Field Magnetic Resonance Imaging - A method and system of magnetic resonance imaging does not need a large homogenous field to truncate a gradient field. Spatial information is encoded into the spin magnetization by allowing the magnetization to evolve in a non-truncated gradient field and inducing a set of 180 degree rotations prior to signal acquisition.10-22-2009
20130099784Method for Magnetic Resonance Imaging with Controlled Aliasing - A method for imaging a subject with a magnetic resonance imaging (MRI) system using controlled aliasing is provided. A radio frequency (RF) excitation field is applied to excite the spins in a volume-of-interest that may include multiple slice locations. Using the MRI system, a readout magnetic field gradient is established following the application of the RF excitation field to form echo signals. These echo signal receive a differential encoding by way of establishing, while the readout gradient is established, alternating magnetic field gradients along two directions, such as the partition-encoding and phase-encoding directions. Image data is acquired from the formed echo signals and images of the subject are reconstructed from the acquired image data.04-25-2013
20130099786PARALLEL MAGNETIC RESONANCE IMAGING USING UNDERSAMPLED COIL DATA FOR COIL SENSITIVITY ESTIMATION - A computer program product (04-25-2013
20120293172SPATIALLY SHAPED PRE-SATURATION PROFILE FOR ENHANCED NON-CONTRAST MRA - A magnetic resonance imaging (MRI) system is used to produce an image representative of the vasculature of a subject by applying a non-contrast MRI pulse sequence to acquire MRI k-space data from non-stationary nuclei flowing in a selected spatial region of a subject after nuclei within the region have been subjected to spatially non-uniform pre-saturation of nuclear magnetic resonance (NMR) magnetization. Such pre-saturation suppresses subsequent MRI signals emanating from background nuclei located within said region during said pre-saturation, while enhancing MRI signal from flowing nuclei therewithin as a function of speed, slice thickness and elapsed time until image capture as a function of the spatially shaped profile of non-uniform pre-saturation across the imaged volume. Thus, acquired MRI k-space data can then be used to reconstruct an image representing vasculature of the subject.11-22-2012
20100102815DYNAMIC COMPOSITE GRADIENT SYSTEMS FOR MRI - A composite gradient system is described, including a body gradient system and an insert gradient system, in which the body gradient system and the insert gradient system can be driven independently and simultaneously. The composite gradient system can provide an operator with the flexibility of imaging a subject using the body gradient system alone, the insert gradient system alone, or both gradient systems simultaneously, and therefore enjoy the advantages of each gradient system. In some embodiments, the body gradient system and the insert gradient system may be driven concurrently during an imaging sequence to produce composite magnetic field gradients having high amplitude and/or fast slew rate, resulting in high image resolution and/or fast image acquisition. In some embodiments, a subject may be imaged using the body gradient system alone while leaving the insert gradient system in place.04-29-2010
20110199083Interference compensation in MR measurements on moving objects through adjustment of the measurement conditions - A method for generating magnetic resonance (MR) images or MR spectra of at least one partial area (08-18-2011
20110204892SPIN ECHO SPI METHODS FOR QUANTITATIVE ANALYSIS OF FLUIDS IN POROUS MEDIA - A method of measuring a parameter in a sample by imaging at least a portion of the sample using a spin-echo single-point imaging (SE-SPI) pulse sequence. This method involves applying a pure phase encoding to the SE-SPI pulse sequence, acquiring a multiplicity of echoes, and determining the spatially resolved T2 distribution. In another embodiment, individual echoes are separately phase encoded in a multi-echo acquisition and the SE-SPI pulse sequence is a hybrid SE-SPI sequence. In another embodiment, an external force can be used to build up a distribution of saturations in the sample, and a T2 distribution can be measured for the sample, which is then used to determine a parameter of the sample. A spatially resolved T2 distribution can also be measured and a resulting spatially resolved T2 distribution used to determine the T2 distribution as a function of capillary pressure.08-25-2011
20100102816EDDY-CURRENT ARTIFACT REDUCTION IN BALANCED STEADY-STATE FREE PRECESSION MAGNETIC RESONANCE IMAGING - Magnetic resonance imaging techniques are described that utilize bSSFP sequences in which two or more gradient waveforms are interleaved in a “groupwise” fashion, i.e., each waveform is executed consecutively two or more times before switching to the other waveform, where “N” counts the number of times each waveform is executed consecutively. As a result, embodiments of the present disclosure can mitigate steady-state signal distortions or artifacts in interleaved balanced steady-state free precession (bSSFP) caused by slightly unbalanced eddy-current fields. Related MRI systems are also described.04-29-2010
20100102814MAGNETIC RESONANCE IMAGING APPARATUS - A Magnetic Resonance Imaging apparatus having an open U- or C-shaped magnet structure, wherein the magnet structure has at least one vertical connection member for joining two horizontal wall members which lie one above the other and are supported in a cantilever fashion and in a predetermined spaced relationship by the vertical member, the vertical member being eccentrically connected to the two wall members at a side edge thereof. The horizontal wall members and the vertical member delimit the upper and lower sides and at least a vertical lateral band of a space for receiving at least one part of a patient body. The horizontal wall members also support means for generating a static magnetic field that permeates the patient receiving space. The apparatus further includes a patient table, supported in an intermediate position between the two horizontal wall members, and lies slightly above the lower horizontal wall part, the table being displaceable in at least one displacement direction, having at least one component of motion towards and/or away from the vertical connection member, and the table being rotatable about a vertical axis outside the magnet structure, i.e. outside the horizontal wall members.04-29-2010
20100102811NMR, MRI, and Spectroscopic MRI in Inhomogeneous Fields - A method for locally creating effectively homogeneous or “clean” magnetic field gradients (of high uniformity) for imaging (with NMR, MRI, or spectroscopic MRI) both in in-situ and ex-situ systems with high degrees of inhomogeneous field strength. The method of imaging comprises: a) providing a functional approximation of an inhomogeneous static magnetic field strength B04-29-2010
20110267054MAGNETIC RESONANCE IMAGING WATER-FAT SEPARATION METHOD - A magnetic resonance imaging (MRI) water-fat separation method includes acquiring in-phase image raw measurement data and out-of-phase image raw measurement data with an MRI device, reconstructing an in-phase image and an out-of-phase image according to a system matrix and the raw measurement data using the penalty function regularized iterative reconstruction method, and calculating water and fat images according to the in-phase image and the out-of-phase image. The use of the penalty function regularized iterative method eliminates the need for k-space raw measurement data with a 100% sampling rate, thereby reducing the MRI scan time, shortening the entire imaging time, and improving the efficiency of the MRI device.11-03-2011
20110267053METHOD FOR THREE-DIMENSIONAL TURBO SPIN ECHO IMAGING - A three-dimensional turbo spin echo imaging method of applying, within a repetition time TR, N groups of pulses to respectively scan N slabs in succession, with each group including one excitation pulse and more than one refocusing pulse, wherein N is a positive integer greater than 1, is improved by applying a first slice selection gradient at the same time as applying each said excitation pulse, and applying a second slice selection gradient at the same time as applying each said refocusing pulse, and applying a phase encoding gradient after having applied each refocusing pulse, then applying a frequency encoding gradient and acquiring scan signals during the duration of the frequency encoding gradient. An image according to the scan signals is reconstructed.11-03-2011
20110199085Radiotherapy and imaging apparatus - A radiotherapy system comprises a patient support, moveable along a translation axis, an imaging apparatus, comprising a first magnetic coil and a second magnetic coil, the first and second magnetic coils having a common central axis parallel to the translation axis, and being displaced from one another along the central axis to form a gap therebetween, the imaging apparatus being configured to obtain an image of a patient on the patient support, a source of radiation mounted on a chassis, the chassis being rotatable about the central axis and the source being adapted to emit a beam of radiation through the gap along a beam axis that intersects with the central axis, a multi-leaf collimator comprising a plurality of elongate leaves movable between at least a withdrawn position in which the leaf lies outside the beam, and an extended position in which the leaf projects across the beam, and a radiation detector mounted to the chassis opposite the source, the radiation detector having a plurality of detector elements aligned with the elongate leaves when projected onto an isocentric plane.08-18-2011
20090167303Method and Apparatus for Magnetic Resonance Analysis - A method of magnetic resonance analysis of a body having therein at least one molecular species and water is disclosed. The method comprises, subtracting magnetic resonance signals induced by a second radiofrequency pulse sequence from magnetic resonance signals induced by a first radiofrequency pulse sequence followed by a evolution period. The first radiofrequency pulse sequence is selected so as to suppress magnetization for the water while preserving a generally longitudinal magnetization to the at least one molecular species. The second radiofrequency pulse sequence being selected so as to suppress transverse and longitudinal magnetization for both the water and the at least one molecular species.07-02-2009
20080278163METHOD AND SYSTEM FOR MAGNETIC RESONANCE IMAGING USING LABELED CONTRAST AGENTS - A method and system for imaging using labeled contrast agents and a magnetic resonance imaging (MRI) scanner are provided. The method comprises performing a prescan at a frequency selected to be substantially similar to a frequency of the labeled contrast agent and performing an examination scan at the frequency of the labeled contrast agent substantially immediately after administering the labeled contrast agent to a subject.11-13-2008
20080284434Visualizing High-Resolution Diffusion Data By Maximum Coherence Projection - A method for displaying diffusion data includes defining intra-voxel coherence and inter-voxel coherence of the diffusion data. On the basis of the inter-voxel coherence and the intra-voxel coherence, a multiplicity of tracks can be defined. Only those tracks having a selected characteristic are displayed.11-20-2008
20080290868Determining phase-encoding direction for parallel MRI - Example systems, methods, and apparatus associated with determining a phase-encoding direction for parallel MRI are described. One example, method includes selecting a set of projection directions along which an MRI apparatus is to apply RF energy to an object to be imaged. The method includes controlling the MRI apparatus to selecting a set of projection directions and to acquire MR signal from the object through a set of detectors. The method includes analyzing the MR signal to identify individual sensitivities for members of the set of detectors and selecting a phase-encoding direction for a pMRI session based on the individual sensitivities for the members. The method produces a concrete, tangible, and useful result by controlling the MRI apparatus to perform the pMRI session based on the selected phase-encoding direction.11-27-2008
20120032677SPATIAL INTENSITY CORRECTION FOR RF SHADING NON-UNIFORMITIES IN MRI - An MRI MAP prescan data from a predetermined imaged patient volume is decomposed to produce a transmit RF field inhomogeneity map and a receive RF field inhomogeneity map for the imaged patient volume based on a three-dimensional geometrical model of the inhomogeneity maps. At least one of the transmit RF field inhomogeneity map and the receive RF field inhomogeneity map is used to generate intensity-corrected target MRI diagnostic scan image data representing the imaged patient volume.02-09-2012
20100127704Method of Visualizing Segmented MR Images - A segmented MR image is provided by measuring a number of Magnetic Resonance Imaging parameters on an absolute scale. For example T1 relaxation, T2 relaxation and Proton Density PD can be measured on an absolute scale. The absolute values are then compared with known values for at least one type of tissue. For human tissue these parameters typically are in the order 300-4500 ms for T1, 50-1000 ms for T2 and 0-100% water for PD. Both T1 and T2 depend on the field strength. Based on a comparison between normal values for a particular type of tissue the values obtained for the image each pixel/voxel can be labeled with a certain probability that the voxel contains this type of tissue and segmented accordingly.05-27-2010
20110204891Direct magnetic imaging apparatus and method - Methods and apparatuses of the present invention perform imaging using a metamaterial lens structure. The apparatus according to one embodiment comprises: a field source capable of generating an electromagnetic field directed to an area in an object or target; a field detector arranged downstream from the field source, the field detector being capable of detecting a field signature associated with the area in the object or target; and a metamaterial lens structure arranged downstream from the field source, the metamaterial lens structure concentrating the electromagnetic field produced by the field source to the area in the object or target, or concentrating the field signature from the area in the object or target to the field detector.08-25-2011
20100201361SYSTEM AND METHOD FOR PASSIVE CATHETER TRACKING WITH MAGNETIC RESONANCE IMAGING - Background tissue signals such as water and/or fat are suppressed in an MR image by using an imaging agent that chemically shifts the tissue spins of interest. An imaging pulse sequence is used to acquire the image data using an RF excitation pulse that is tuned to the off-resonance tissue spins of interest with the saturation pulse sequences being interleaved with the imaging pulse sequences to selectively suppress signals from on-resonance background tissues such as water and/or fat.08-12-2010
20100201360MAGNETIC RESONANCE IMAGING APPARATUS - When the settings of the region of interest are received from the operator, the measurement data acquisition control unit performs control so that an image for generating profile data is taken, and the data processing unit generates profile data in the encoding directions of the set region of interest. Then, the field-of-view setting unit sets the field of view in each of the encoding directions, based on the relationship between the dimensions of the subject P in the encoding directions that are calculated from the profile data of the encoding directions and the dimensions of the region of interest in the corresponding encoding directions, by use of coefficients stored in the coefficient storage unit.08-12-2010
20100264922System for Multi Nucleus Cardiac MR Imaging and Spectroscopy - A system for respiratory motion compensated MR imaging or spectroscopy, comprises an MR imaging system. The MR imaging system performs a single imaging scan including, acquiring a first imaging data set representing a spatially localized first imaging region located on a patient diaphragm, using a first RF excitation pulse sequence and by transmitting a nuclei excitation first resonant frequency and receiving data substantially at the first resonant frequency. The MR imaging system derives data representing diaphragm position over a respiratory cycle using the first imaging data set, in the single imaging scan. The MR imaging system in response to determining the diaphragm position is within a predetermined window, acquires a second anatomical imaging data set representing a spatially localized second imaging region using a second RF excitation pulse sequence and by transmitting a nuclei excitation second resonant frequency different to the first resonant frequency and receiving data substantially at the second resonant frequency in the single imaging scan.10-21-2010
20100264921SQUID DETECTED NUCLEAR MAGNETIC RESONANCE AND IMAGING AT ULTRA-WEAK FIELDS - The invention provides a high resolution proton nuclear magnetic reonance and imaging (NMR/MRI) in microtesla magnetic fields by using high critical temperature (high-T10-21-2010
20100264920SPIN LOCKED BALANCED STEADY-STATE FREE PRECESSION (SLSSFP) - A spin locked balanced steady-state free precession (slSSFP) pulse sequence combines a balanced gradient echo acquisition with an off-resonance spin lock pulse for fast MRI. The transient and steady-state magnetization trajectory is solved numerically using the Bloch equations and is shown to be similar to balanced steady-state free precession (bSSFP) for a range of T2/T1 and flip angles, although the slSSFP steady-state could be maintained with considerably lower RF power. In both simulations and brain scans performed at 7 T, slSSFP is shown to exhibit similar contrast and SNR efficiency to bSSFP, but with significantly lower power.10-21-2010
20100264919NMR-Detecting Cell, NMR-Measuring Method, and NMR-Measuring Apparatus - An object of the present invention is to provide an effective method for measuring by NMR in real time, an NMR-detecting cell for measurement of NMR, and an NMR-measuring apparatus.10-21-2010
20080272778ENHANCED SPECTRAL SELECTIVITY FOR STEADY-STATE FREE PRECESSION IMAGING - A method of collecting image data with selective spectral suppression for at least two species is provided. A sequence of RF excitation pulses is repeatedly applied, whereby a repeated sequence of at least two substantially different spectrally selective steady-state magnetizations is established. Magnetic gradients are applied between said RF pulses. A plurality of magnetic resonance image (MRI) signals is acquired. The plurality of MRI signals is combined using a weighted combination where the weights depend on a control parameter that adjusts a trade-off between selective spectral suppression and signal-to-noise ratio (SNR).11-06-2008
20080272779Determination of Distribution Information of a Contrast Agent by Mr Molecular Imaging - MR based molecular imaging is used for the quantification of contrast agent concentrations. According to an exemplary embodiment of the present invention, a difference between R2 and R2* relaxation rates of a contrast agent is determined on the basis of data measured after contrast agent application. This may provide for an in vivo information relating to a compartmentalization or binding status of the contrast agent, and thus may improve the significance of the examination result.11-06-2008
20080272780Method for Accounting for Shifted Metabolic Volumes in Spectroscopic Imaging - In a magnetic resonance method, a localizing magnetic field gradient (G11-06-2008
20080272777ARTIFACT REDUCTION IN STEADY-STATE FREE PRECESSION IMAGING - A method of reducing artifacts in steady-state free precession (SSFP) signals for use in magnetic resonance imaging is provided. A plurality of SSFP imaging sequences is applied to an object. An imaging data for each of the SSFP imaging sequences is acquired. The imaging data is combined using a weighted combination where weights depend on a control parameter that adjusts a trade-off between banding artifact reduction and signal to noise ratio (SNR).11-06-2008
20110006770Method and device for measuring a sample in an NMR spectrometer using a coupling configuration with a press fit cell having a capillary envelope fastener - A method for measuring an sample in an NMR spectrometer uses a coupling configuration (01-13-2011
20110006768SYSTEMS AND METHODS FOR ACCELERATING THE ACQUISITION AND RECONSTRUCTION OF MAGNETIC RESONANCE IMAGES - A method and system of accelerating the acquisition and reconstruction of magnetic resonance images. Magnetic resonance imaging (“MRI”) data is acquired from a plurality of coils using parallel MRI (“pMRI”). The MRI data represents a reduced field-of-view (“FOV”) image for each of a plurality of coils. The MRI data is further undersampled by sequentially applying a compressed sensing (“CS”) technique, such as SparseMRI. The undersampled, reduced FOV images are then reconstructed into a final magnetic resonance image using a pMRI reconstruction technique, such as SENSitivity encoding (“SENSE”). This combination of MR image acquisition, sampling, and reconstruction is referred to as CS-SENSE.01-13-2011
20110006767DEVICE AND PROCESS FOR MAGNETIC RESONANCE ELASTOGRAPHY (MRE) - The invention relates to a device to produce mechanical oscillations in a research object using magnetic resonance elastography (MRE) with a membrane that can be set into periodic motion (01-13-2011
20100134107MAGNETIC RESONANCE IMAGING SYSTEM AND METHOD - A magnetic resonance imaging system is characterized in that a control unit executes, as pulse sequences, a first sequence for obtaining data of a predetermined 2-dimensional region in a k-space and a second sequence for obtaining data required for reconstruction of an image by irradiating an object to be examined with an inversion recovery pulse and corrects the phase of the data obtained by the second sequence with the data of the 2-dimensional region obtained by the first sequence, and in that a signal processing unit reconstructs a real component image with corrected data.06-03-2010
20130119982Magnetic Resonance Tomography System, Receive Apparatus and Method - A magnetic resonance tomography (MRT) system has a receive apparatus disposed in a magnetic field, in which a receive coil is coupled to an input of an analog/digital converter. The analog/digital converter is configured for this purpose. A digital output of the analog/digital converter is coupled via a digital mixer device and a clock-rate-reduction device to a data output of the receive apparatus. The mixer device is configured to mix a predetermined frequency band of the MR signal downwards into an intermediate frequency range and create a digital IF signal.05-16-2013
20130119983METHOD AND MAGNETIC RESONANCE SYSTEM TO GENERATE ANGIOGRAPHY IMAGES - In the generation of MR angiography images of a predetermined three-dimensional volume segment of a living examination subject using means a magnetic resonance system, MR data in the volume segment are acquired by radial acquisition of k-space. The MR data are analyzed in order to subdivide the MR data into groups, with each group including only the MR data that correspond to a specific heart beat phase of the heat of the examination subject. MR angiography images are generated based only on the MR data of one of these groups.05-16-2013
20130119985MRI METHOD FOR RETROSPECTIVE MOTION CORRECTION WITH INTERLEAVED RADIAL ACQUISITION - A motion-corrected magnetic resonance imaging method comprises: sequentially acquiring a plurality of interleaved magnetic resonance radial acquisition datasets using a magnetic resonance scanner; reconstructing each magnetic resonance radial acquisition dataset into a corresponding image to generate a set of images, the reconstructing including expanding radial k-space lines of the magnetic resonance radial acquisition dataset into corresponding radial bands in k-space using a generalized auto-calibrating partially parallel acquisition (GRAPPA) operator; selecting a reference image from the set of images; performing three-dimensional spatial registration of each image of the set of images except the reference image with respect to the reference image to generate a spatially registered set of images; and combining the spatially registered set of images to generate a motion corrected image.05-16-2013
20130214783IMAGING METHOD AND DEVICE FOR WATER/FAT SEPARATION IN MAGNETIC RESONANCE IMAGING - In an imaging method and device for water/fat separation in MRI using a two-point Dixon FSE sequence, each refocusing RF pulse corresponds to two readout gradients of the same polarity, each being center-divided into a smaller rear part and a larger front part, and one rephasing gradient of opposite polarity. In running the FSE sequence, each echo signal acquired is subjected to an FFT, to reconstruct an image with water and fat in phase and an image with water and fat in opposed phases. Data of each echo signal are subjected to a partial Fourier transform; and the in-phase water/fat image and the opposite-phase water/fat image are subjected to a water/fat separation algorithm, to obtain a pure water image and a pure fat image.08-22-2013
20100271022MAGNETIC RESONANCE IMAGING APPARATUS AND RF COIL - A receiving RF coil includes a coil element group having a figure-eight coil, a first loop coil arranged at the center of the figure-eight coil, and a second loop coil partially overlaid on the first loop coil. Furthermore, a path switching control unit switches the transmitting paths of a signal so that the signal can be received and/or transmitted with a combination of the first loop coil and the second loop coil or a combination of the figure-eight coil and the first loop coil.10-28-2010
20100141255Nuclear Magnetic Resonance Apparatus, Methods and Associated Technology - NMR technology disclosed herein, such as an NMR apparatus or an NMR method, for example, may be useful for purposes described herein, such as determining presence or absence of magnetic resonance from a sample, for example. Methods pertaining to such NMR technology include methods of designing or constructing NMR apparatus, methods of using NMR apparatus, methods of employing data obtained from NMR apparatus, and/or the like. Various apparatus and methods for detection of magnetic resonance in sample material are disclosed herein. Additionally, various apparatus and methods for usefully employing magnetic resonance data are disclosed herein.06-10-2010
20100141256QUANTUM THEORY-BASED CONTINUOUS PRECISION NMR/MRI: METHOD AND APPARATUS - A method for spin magnetic resonance applications in general, and for performing NMR (nuclear magnetic resonance spectroscopy) and MRI (nuclear magnetic resonance imaging) in particular is disclosed. It is a quantum theory-based continuous precision method. This method directly makes use of spin magnetic resonance random emissions to generate its auto-correlation function and power spectrum, from which are derived spin relaxation times and spin number density using strict mathematical and physical equations. This method substantially reduces the NMR/MRI equipment and data processing complexity, thereby making NMR/MRI machines less costly, less bulky, more accurate, and easier to operate than the pulsed NMR/MRI. By employing extremely low transverse RF magnetic B06-10-2010
20110215806LIQUID COMPOSITIONS AND USES THEREOF FOR GENERATING DIFFUSION ORDERED NMR SPECTRA OF MIXTURES - Provided are homogeneous liquid systems substantially 09-08-2011
20090160441Magnetic Resonance Imaging Apparatus - A vertical magnetic field type MRI apparatus is capable of high-speed-imaging a large cross section such as a whole human body while suppressing an increase in the number of channels and maintaining sensitivity to a deep portion of a subject to be high. A receiving coil is composed of a plurality of sub coils. A first sub coil (06-25-2009
20090128147NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY WITH MULTIPLE-COIL PROBES - An NMR inspection apparatus comprises a system for providing a dissolved, hyperpolarized sample and an NMR analysis system connected to the hyperpolarizing system are disclosed. The NMR analysis system includes a magnet for generating a substantially homogeneous magnetic field in a working volume suitable for carrying out NMR and a number of RF magnetic field generators located in the working volume. A non-electrically conducting conduit passes adjacent the RF magnetic field generators and is coupled to the hyperpolarizing system so as to convey a hyperpolarized sample past each RF magnetic field generator in sequence. A sample control system controls movement of a sample through the conduit. An NMR signal acquisition system controls the RF magnetic field generators to generate RF magnetic fields in accordance with a predetermined pulse sequence and detects the resulting NMR signals from the portions of the sample exposed to the RF magnetic fields.05-21-2009
20090278536WAVE-PROPAGATION BASED ESTIMATION OF COIL SENSITIVITIES - Low resolution image data from a whole-body coil (11-12-2009
20090184712SYSTEM AND METHOD FOR ACTIVE MR TRACKING - A system and method for active MR tracking includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, an RF coil assembly positioned in the bore, and a pulse module. The MRI system also includes a polarization reversal switch controlled by the pulse module to transmit RF signals to the RF coil assembly coupled to the polarization reversal switch and an RF switch controlled by the pulse module to transmit the RF signals to the polarization reversal switch.07-23-2009
20120139540METHOD OF EVALUATING PERFORMANCE CHARACTERISTICS - A non-destructive method of visualizing penetration of a soil and/or fabric conditioning component in a fabric using imaging techniques. The method may be used to determine qualitatively and/or quantitatively the penetration of soil and/or fabric conditioning component into the fabric. By comparing images before and after fabric treatment processes, the efficacy of a fabric treatment processes can be assessed.06-07-2012
20120068706Dual-Resonance Structure and Method for Examining Samples Using A Plurality of Conductive Strips - A double-resonance structure 03-22-2012
20120068704MAGNETIC RESONANCE METHOD AND SYSTEM TO GENERATE MR IMAGE DATA WITH PARALLEL SLICE EXCITATION - In a method and a magnetic resonance (MR) system and method to generate MR image data of a predetermined volume segment within an examination subject, multiple slices of the volume segment are simultaneously excited by at least one RF excitation pulse, and during the excitation a slice selection gradient is switched. The measurement signals from the multiple slices are acquired with multiple RF reception antennas, at least some of which are spaced along the propagation direction of the slice selection gradient. During the acquisition of the measurement signals the slice selection gradient is switched in order to achieve a spectral separation of the measurement signals of different slices. The MR image data are generated from the measurement signals.03-22-2012
20120068703METHOD FOR SPATIALLY RESOLVED DETERMINATION OF AN MR PARAMETER - In a magnetic resonance (MR) method and apparatus for spatially resolved determination of at least one MR parameter that influences an MR signal detected in an MR measurement of a region of an examination subject, first complex image data and second complex image data, respectively acquired with different acquisition coils and at different echo times in an echo imaging sequence, are provided to a processor. The different image data sets have complex image points that correspond with each other with regard to the imaged volume element of the examination subject. The MR parameter is determined in the processor for at least a portion of these image points by determination of an image point vector respectively for the first and second echo times and by combining the image point vectors to at least partially compensate echo time-independent phase or magnitude portions in the acquired image data.03-22-2012
20120068702METHOD AND MAGNETIC RESONANCE SYSTEM TO GENERATE A SERIES OF MAGNETIC RESONANCE EXPOSURES - In a magnetic resonance method and apparatus, a series of magnetic resonance exposures of an examination subject is generated by implementing multiple first measurements (data acquisitions) with variation of a measurement parameter from acquisition-to-acquisition, which strongly influences a contrast of the first material type excited in the first measurements, implementing multiple second measurements in which a second material type is essentially selectively imaged that is less contrast-dependent with regard to this measurement parameter in a processor calculating spatial correction values for image data of the first measurements based on spatial differences between image data of different second measurements, and, also in the processor, spatially correcting image data of the first measurements (Di) and/or registration of image data of different first measurements to one another on the basis of the correction values.03-22-2012
20120068701System and Method for Improving the Analysis of Chemical Substances Using NQR - The present application discloses systems and methods for analyzing a chemical substance containing quadrupolar nuclei to determine a measurable characteristic of the substance. The systems and methods include irradiating the substance with RF energy to stimulate NQR of certain quadrupolar nuclei within the substance, receiving and processing a signal emitted from the substance to isolate an NQR signal therefrom, analyzing the NQR signal to obtain a measure of the characteristic of the substance, and providing an output indicative of the measure for analytical purposes.03-22-2012
20120286783Accelerated MRI with Nonlinear Spatial Encoding Gradients - In a method of magnetic resonance imaging, a set of nonlinear, mutually orthogonal magnetic gradient encoding fields are sequentially and separately generated in an imaging region [11-15-2012
20080315877Imaging Tissue Deformation Using Strain Encoded Mri - Disclosed is a system and method for imaging strain of tissue, such as the heart, in a quantitative manner. The present invention provides images of strain, which corresponds to heart function, by tagging a tissue region of interest, and acquiring multiple images by tuning an MRI RF receiver to frequencies above and below the tagging frequency. Depending on the tagging spatial frequency, and the spread between the high- and low-tuning frequencies, linear measurements of strain may be made on a pixel by pixel basis. By selectively tagging the tissue of interest by use of selective excitation, images may be acquired sufficiently fast to provide anatomical and functional imagery within a single heartbeat. By acquiring additional images, dead tissue may be differentiated from contracting tissue as well as blood.12-25-2008
20100259262MAGNETIC RESONANCE IMAGING APPARATUS - A storage unit stores coil positional information that indicates a physical position of an element coil relative to a representative position set on a receiving coil. A creating unit creates profile data that indicates a distribution of Nuclear Magnetic Resonance (NMR) signals in a coil-arrangement direction. A calculating unit calculates the position of a representative position set on the receiving coil by performing a regression analysis by using the coil positional information and the profile data. A control unit causes a display unit to display the position of each element coil based on the calculated position of the representative position.10-14-2010
20080238423METHOD AND APPARATUS FOR ACCELERATING MAGNETIC RESONANCE TEMPERATURE IMAGING - In a method and apparatus for accelerating MR temperature imaging used in MR-monitored high intensity focused ultrasound (HIFU) therapy, temperature changes are determined at the focus of the ultrasound during MR temperature imaging; determining the ideal acceleration rate needed for data sampling according to the temperature changes at said focus is determined, the variable-density (VD) data sampling in k-space is adjusted according to the determined ideal acceleration rate, and the data obtained from sampling are reconstructed to form an image. The capability of accelerating MR temperature imaging with both good temporal resolution and good spatial resolution is improved by determining the acceleration rate according to temperature changes at the ultrasound focus and by adjusting the VD data sampling of k-space and thereby the benefits of good flexibility, feasibility and stability are achieved.10-02-2008
20100259261MRI RADIO FREQUENCY RECEIVER COMPRISING DIGITAL DOWN CONVERTER - The invention relates to a nuclear magnetic resonance imaging radio frequency—receiver (10-14-2010
20100259260Simultaneous excitation and acquisition of signal from multiple slices in the RARE sequence (multiplex RARE) - A method for RARE magnetic resonance imaging comprising slice selective excitation of two or more slices and of one or more nuclei, followed by refocusing of these slices and application of gradient pulses which cause a diversion of the signal into spin echoes and stimulated echoes, is characterized by application of refocusing slice selective RF pulses, which are placed to fulfill the echo-spacing CPMG condition for each slice and by arrangement of gradient pulses which cause the phase accumulated by spins in each slice between two consecutive refocusing RF pulses corresponding to that slice to be equal, thus fulfilling the CPMG phase accumulation condition. Thereby, the obtainable signal can be increased and stabilized.10-14-2010
20110140698METHOD AND DEVICE FOR PHASE-SENSITIVE FLOW MEASUREMENT BY MAGNETIC RESONANCE - In a method and a device for phase-sensitive flow measurement of a volume segment of an examination subject using a magnetic resonance (MR) system, the volume segment is coded for imaging of this volume segment and a phase coding of the volume segment to code flow information of the volume segment is implemented. MR data are read out from the volume segment and the MR data are evaluated in order to generate an image of the volume segment with flow information. The phase coding to code the flow information is thereby independent of gradients which are used for spatial coding of the volume segment.06-16-2011
20110227572System for Fat Suppression in MR Image Acquisition - A system for fat signal suppression in MR imaging comprises an RF signal generator for generating RF pulses in an MR pulse sequence using one or more RF pulses for echo signal formation including, an RF excitation pulse and an RF refocusing pulse subsequent to said RF excitation pulse. A magnetic field slice select gradient generator generates first and second different slice select magnetic field gradients for corresponding use with the RF excitation pulse and the RF refocusing pulse, respectively, the first and second different slice select magnetic field gradients having substantially different amplitudes. An MR imaging control unit directs acquisition of MR imaging data having fat signal substantially suppressed using the generated RF pulses and different slice select magnetic field gradients.09-22-2011
20130214782FLOW-SENSITIVE, FREQUENCY-INDEPENDENT EXCITATION OF MAGNETIC RESONANCE SIGNALS - A transmit coil system of a magnetic resonance system is exposed to high-frequency transmit pulses so that atomic nuclei of a predetermined type of atomic nucleus of an examination object introduced into an examination volume are excited by the high-frequency transmit pulses to emit magnetic resonance signals. A gradient magnetic system is exposed to gradient currents during the exposure of the examination volume to the high-frequency transmit pulses so that gradient magnetic fields are superimposed on a basic magnetic field generated by a basic magnet in the examination volume. The gradient currents and the high-frequency transmit pulses are matched to each other such that the atomic nuclei are exclusively those with a velocity lying within or outside a predetermined velocity range. The excitation is independent of variations in the Larmor frequency of the relevant type of atomic nucleus caused by inhomogeneities of the basic magnetic field and/or by chemical displacement.08-22-2013
20090015256Optimized MRI strip array detectors and apparatus, systems and methods related thereto - Featured is a device for NMR or MRI signals from excited nuclei as well as related apparatus, systems and methods. The device includes a strip array antenna including one or more conductor and N reactive tuning components, where N is an integer ≧1 at least one of the N reactive components is electrically coupled to each of the one or more conductors as well as to ground/virtual ground. The apparent electrical length of the conductors is tuned with the reactive tuning components so it is equal to be about nλ/4, where n is an integer ≧1 and λ is the wavelength of the signal to be detected. The length of the strip also is such as to be substantially in the approximate range of 1.3 times the depth of interest. The strip conductors are also combined with loop coils to form quadrature detectors.01-15-2009
20090015257MAGNETIC RESONANCE ANATOMICAL IMAGE GENERATING METHOD AND SYSTEM - In a method to generate an anatomical image of an examination area with a magnetic resonance apparatus as well as computer program and magnetic resonance apparatus for implementation of the method, at least one image data set of the examination area and a parameter value map are loaded. The at least one loaded image data set and the loaded parameter value map are processed into an anatomical image. The processing includes a weighting of elements of the at least one image data set with a weighting factor. The weighting factor depends on a parameter value of the parameter value map corresponding to the respective element of the image data set. The generated weighted anatomical image is displayed and/or stored.01-15-2009
20090230958SLICE-SELECTIVE TUNABLE-FLIP ADIABATIC LOW PEAK POWER EXCITATION - A manifestation of the invention provides a method for slice selective excitation for magnetic resonance imaging (MRI). A B09-17-2009
20090201021PHASE CORRECTION METHOD - A method corrects for a phase error in an MR image, in which MR signals of an examination subject are acquired, complex images of the examination subject are generated, phase differences of the phase values for various image points of the complex images are established with an averaged phase value of image points from a first surrounding region of a respective image point, and a phase correction is executed dependent on how well the phase differences correspond to a predetermined phase value, where the order of the image points in which the phase correction is implemented is dependent on how well the phase values in the image points correspond to the predetermined phase value.08-13-2009
20110221440POSITIVE MAGNETIC RESONANCE IMAGING CONTRAST METHODS AND APPARATUS USING CHEMICAL EXCHANGE SATURATION TRANSFER - In one aspect, an apparatus for performing chemical exchange saturation transfer (CEST) magnetic resonance imaging on a region of an object being imaged is provided. The method comprises at least one coil capable of being operated to emit radio frequency (RF) signals, at least one detector capable of detecting nuclear magnetic resonance signals, and at least one controller to operate the at least one coil to provide at least one inversion sequence to the region to flip at least some spins in the region by a desired flip-angle, operate the at least one coil to provide at least one first pulse sequence at a first frequency offset from a peak resonant frequency of water by a first amount in a first direction to magnetize at least one exchange group in the region, operate the at least one coil to provide at least one second pulse sequence at a second frequency offset from the peak resonant frequency of water by the first amount in a second direction opposite the first direction, operate the at least one detector to measure a first signal emitted from the region as a result of providing the at least one first pulse sequence after a predetermined time interval after applying the first inversion sequence, and operate the at least one detector to measure a second signal emitted from the region as a result of providing the at least one second sequence at the predetermined time interval after applying the at least one inversion sequence, wherein the predetermined time interval is selected such that positive contrast is achieved with respect to the first signal relative to the second signal.09-15-2011
20090108844MAGNETIC RESONANCE IMAGING AND RADIO FREQUENCY IMPEDANCE MAPPING METHODS AND APPARATUS - In one aspect, a method of obtaining magnetic resonance (MR) and radio-frequency impedance mapping (RFIM) data from a region of an object arranged proximate a plurality of radio-frequency (RF) coils is provided. The method comprises detecting nuclear magnetic resonance (NMR) signals emitted from the region to form, at least in part, first MR data, obtaining at least one impedance measurement from the plurality of RF coils to form, at least in part, first RFIM data, and computing a first RFIM map indicating a spatial distribution in the region of at least one dielectric property, the first RFIM map computed based, at least in part, on the first RFIM data and the first MR data.04-30-2009
20090108843METHOD AND APPARATUS FOR CORRECTING DISTORTION IN MR IMAGES CAUSED BY METALLIC IMPLANTS - A technique for reconstructing a corrected MR image from MR images distorted by foreign object induced magnetic fields includes locating a foreign object in a subject and defining a localized area of a field of view about the foreign object where a magnetic field distortion adversely affects a first magnetic distortion correction technique. The first magnetic distortion correction technique is applied to the field of view other than in the localized area. A second magnetic distortion correction technique is applied to the localized area and the results of the application of the first and second magnetic distortion correction techniques are combined. An image is reconstructed based on the results of the application of the first and second magnetic distortion correction techniques.04-30-2009
20090212773ARTERIAL SPIN LABELED, SEGMENTED, INTERLEAVED 3D GRASE MRI - A magnetic resonance imaging (MRI) method of obtaining MRI images of a patient and storing the images in physical storage media.08-27-2009
20090212772MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a data acquisition unit and an image generating unit. The data acquisition unit acquires echo signals by echo planar imaging which generates the echo signals with correcting and applying plural gradient magnetic fields for phase encode and with continuously inverting a gradient magnetic field for readout after one nuclear magnetic excitation. Each of the plural gradient magnetic fields for phase encode has an intensity set so as to compensate an influence of an eddy current distributing spatially adaptively to each of imaging positions. The image generating unit generates image data based on the echo signals.08-27-2009
20120268121METHOD FOR R*2 QUANTIFICATION WITH MAGNETIC RESONANCE IMAGING - A method for measuring transverse relaxation rate, R10-25-2012
20110140697MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, an MRI apparatus includes an imaging unit and an application region calculating unit. The application region calculating unit automatically calculates an application region of a prepulse according to a region of interest of magnetic resonance imaging based on image data including the region of interest that are acquired before the application of the prepulse. The imaging unit performs magnetic resonance imaging of an object involving the application of the prepulse.06-16-2011
20110140696SYSTEM AND METHOD FOR QUANTITATIVE SPECIES SIGNAL SEPARATION USING MR IMAGING - A system and method for quantitative species signal separation in MR imaging is disclosed. An MR imaging apparatus includes an MRI system and a computer programmed to cause the MRI system to apply a pulse sequence and acquire multi-echo source data for the pulse sequence that includes a phase component and a magnitude component. The computer is further programmed to determine a first estimate of a first species content and a first estimate of a second species content based on the multi-echo source data, and determine a second estimate of the first species content and a second estimate of the second species content based on the multi-echo source data.06-16-2011
20090256566MEDICAL IMAGING METHOD AND SYSTEM WITH AUTOMATED ASSOCIATION OF IMAGES WITH MEASUREMENT SEQUENCES - A medical imaging system is operated corresponding to a measurement sequence to acquire data of an examination subject. A control device associates a reference to the measurement sequence with the acquired data and stores the acquired data including the associated reference. The control device determines an image of the examination subject using the acquired data and outputs the determined image to an operator of the medical imaging system via a viewing device. When a corresponding activation command is provided to it by the operator, the control device automatically determines the corresponding measurement sequence using the reference associated with the displayed image, and automatically associates a reference to at least one image corresponding with the displayed image with the measurement sequence. The control device provides the measurement sequence (S) for search purposes upon retrieval of the measurement sequence, the control device also automatically retrieves the images associated with the retrieved measurement sequence as well.10-15-2009
20100264925MAGNETIC RESONANCE METHOD AND APPARATUS FOR ACQUIRING MEASUREMENT DATA FROM A SUBJECT CONTINUOUSLY MOVING THROUGH THE APPARATUS - In a method and apparatus for the acquisition of measurement data of an examination region of an examination subject (in particular a patient) during continuous travel of the examination region through a magnetic resonance apparatus for the generation of an image data set, the continuous travel is interrupted and resumed at least once. The examination region is moved back by a predeterminable distance counter to the travel direction of the continuous travel before interrupting the continuous travel. Moving the examination region back makes it possible to interrupt and resume an acquisition of measurement data given (otherwise) continuous travel of the examination region, without loss of measurement data. The time during the interruption can be used advantageously for preparation of an acquisition of measurement data in the portion of the examination region of the patient that is to be examined after the interruption of the continuous travel. In particular, during the interruption a patient can be prepared to hold his or her breath for an acquisition of additional measurement data that follows the interruption. The continuous travel can be interrupted arbitrarily often.10-21-2010
20100013481MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE SPECTROSCOPIC IMAGE COMPUTING METHOD - An object of the invention is to obtain a magnetic resonance spectroscopic image to which the MAC summation is applied with high accuracy and in short time, even though a phase characteristic distribution of the MAC has a spatial non-uniformity, in the MRSI measurement using a magnetic resonance imaging apparatus provided with a MAC.01-21-2010
20090315561MAGNETIC RESONANCE DATA ACQUISITION SYSTEM AND METHOD WITH PARAMETER ADJUSTMENT DURING PATIENT MOVEMENT - In a method and a magnetic resonance (MR) system for acquisition of MR data of a measurement subject in an MR examination in the magnetic resonance system, MR data of the measurement subject (are acquired according to measurement parameters while the measurement subject is moved relative to the magnetic resonance system, the acquired MR data are analyzed, and the measurement parameters are automatically adapted.12-24-2009
20090315560APPARATUS AND METHOD FOR DECREASING BIO-EFFECTS OF MAGNETIC GRADIENT FIELD GRADIENTS - A magnetic field generator includes a power source and a coil connected to the power source to generate a time-varying magnetic field. Energy is applied to the coil so that the coil generates a time-varying magnetic field gradient with a magnitude of at least 1 milliTesla per meter and a rise-time of less than 10 microseconds. One or more of a capacitor, a multi-stage high-voltage switch, and/or a pulse-forming network may assist with the generation of the magnetic field gradient.12-24-2009
20090251142Magnetic Resonance Imaging Apparatus - The MRI apparatus of the present invention executes a non-imaging mode 10-08-2009
20120194190MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR ADJUSTING EXCITATION REGION - In imaging using 2-dimensional selective excitation pulses, regardless of applications thereof, a technique for obtaining a high quality image is provided.08-02-2012
20120194189System and Method for Diffusion-modulated Relaxation Magnetic Resonance Imaging - A system and method for applying an RF excitation pulse to the region of interest (ROI) and a plurality of selective gradients to the ROI to elicit MR data pertaining to at least a first MR parameter from the ROI. The system and method also apply at least one diffusion gradient to the ROI to modulate the first MR parameter with a second MR parameter, acquire MR data from the ROI, and reconstruct a parametric map of the ROI using the MR data, wherein the parametric map is weighted based on the first MR parameter and modulated by the second MR parameter.08-02-2012
20120194188System and Method for Controlling Apparent Timing Dependencies for T2-Weighted MRI Imaging - A system and method for imaging includes applying an RF excitation pulse to a region-of-interest (ROI) in the presence of a first slice selective gradient and applying a readout gradient to acquire a echo signal from the ROI, wherein a time between the RF excitation pulse and the echo signal define an echo time (TE). A saturation module is applied to the ROI including an RF pulse configured to provide a TE-independent steady state and enforcing a predetermined time period (TR08-02-2012
20120194186MR Imaging System for Discriminating Between Imaged Tissue Types - A system provides B1- and B0-insensitive, blood flow and motion-robust T2-preparation and T2-preparation combined with inversion recovery. An MR imaging system discriminates between imaged tissue types based on transverse relaxation time (T2) or transverse relaxation time combined with longitudinal recovery time (T1). A signal generator generates a pulse sequence for T2 preparation or combined T2-preparation with inversion recovery comprising one or more B1 independent refocusing (BIREF-1) pulses for refocusing of magnetization of an anatomical region of interest being imaged, and different combinations of adiabatic or non-adiabatic tip-down and flip-back pulses. Multiple RF coils transmit RF pulses in response to the pulse sequence and acquire RF data in response to transmission of the RF pulses. A processing system processes the RF data to provide a display image indicating different tissue types with enhanced discrimination based on T2 relaxation time difference or combined T2 and T1 time difference.08-02-2012
20090256565METHOD AND SYSTEM FOR RECONSTRUCTING IMAGES - A method for reconstructing an image in a magnetic resonance imaging system is provided. The method includes steps of acquiring magnetic resonance signals from a plurality of receiver coils placed about a subject, each receiver coil having a coil sensitivity, iteratively polling each acquired magnetic resonance signal for determining one or more significant wavelet components of each acquired magnetic resonance signal by utilizing a coil sensitivity function of each receiver coil for each acquired magnetic resonance signal, iteratively determining one or more coefficients based on the one or more significant wavelet components to generate a plurality of coefficients for each acquired magnetic resonance signal, reconstructing an image utilizing a corresponding plurality of coefficients corresponding to each acquired magnetic resonance signal, and generating a composite image by combining the reconstructed images.10-15-2009
20090256564MAGNETIC RESONANCE RADIO FREQUENCY SYSTEM AND OPERATING METHOD THEREFOR - In a method for processing radio frequency signals of a magnetic resonance imaging system in which the coil portion of the magnetic resonance imaging system includes a body coil and a local coil, radio frequency signals are supplied to the body coil, and these radio frequency signals are coupled to said local coil, and transmitted by said local coil into a region to be examined. A corresponding radio frequency system has a local coil and a body coil, with power coupling between the local coil and the body coil; during the phase for transmitting the radio frequency signals. The body coil serves to couple the radio frequency signals to be transmitted to the local coil, and the local coil serves to transmit the coupled radio frequency signals to a region to be examined. This method and system allow the transmitting function of the local coil to be achieved without having a coil plug on a patient bed to provide a radio frequency signal transmitting channel.10-15-2009
20100176809MAGNETIC RESONANCE TOMOGRAPHY DEVICE WITH LOCALIZATION SYSTEM AND METHOD TO LOCALIZE A LOCAL COIL - A magnetic resonance tomography device has a magnet system that generates a gradient field; with a local coil that receives a magnetic resonance signal; and with a localization system that is fashioned to locate the local coil. The localization system has a number of magnetic field sensors that are integrated with the local coil and fashioned to detect the gradient field. Such a device is used in a corresponding method for localization of a local coil in a magnetic resonance tomography device, and a local coil is fashioned so as to be suitable for this purpose.07-15-2010
20100156417SYSTEM AND METHOD FOR FAST MR IMAGING OF METABOLITES AT SELECTIVE EXCITATION FREQUENCIES - A system and method are provided for imaging multiple substances, such as contrast agents and metabolites in vivo, with selective excitation frequencies. A first substance is excited with a frequency selective pulse, then a second substance is excited with another frequency selective pulse. The signals resulting from these pulses are acquired in an order reversed from the order in which the pulses were applied. In some embodiments, more than two substances may be imaged. The system and method thus provide for quick and efficient utilization of the magnetization of multiple substances for spectral-spatial imaging.06-24-2010
20100156416Method and apparatus for processing combined MR/emission tomography recordings - A method and an apparatus are disclosed for determining the effective count rate of photons in a combined MR/emission tomography recording. In at least one embodiment, the method includes capturing MR signals with an MR apparatus in an MR/emission tomography device for producing an MR recording of an examination object with a number of tissue types, each having a specific MR parameter; associating a number of emission tomography attenuation coefficients with the number of tissue types as a function of the MR parameter by way of an association unit, so that one emission tomography attenuation coefficient corresponds in each instance to at least one of the tissue types in the examination object; capturing photons in the examination object with an emission tomography apparatus in the MR/emission tomography device for producing an emission tomography recording; and weighting the emission tomography recording with the emission tomography attenuation coefficients by way of a correction apparatus for determining the effective count rate in the number of tissue types and for producing a corrected emission tomography recording.06-24-2010
20100156414APPARATUS FOR HIGH-RESOLUTION NMR SPECTROSCOPY AND/OR IMAGING WITH AN IMPROVED FILLING FACTOR AND RF FIELD AMPLITUDE - The present invention concerns an apparatus (06-24-2010
20120194183Image Acquisition Optimization - A system and a method for acquiring image data of a subject with an imaging system is provided. The system can include a gantry that completely annularly encompasses at least a portion of the subject, with a source positioned within and movable relative to the gantry. The source can be responsive to a signal to output at least one pulse. The system can include a detector positioned within and movable relative to the gantry to detect the pulse emitted by the source. The system can also include a detector control module that sets detector data based on the detected pulse, and an image acquisition control module that sets the signal for the source and receives the detector data. The image acquisition control module can reconstruct image data based on the detector data. The signal can include a signal for the source to output a single pulse or two pulses.08-02-2012
20090315559BLACK-BLOOD STEADY-STATE FREE PRECESSION MAGNETIC RESONANCE IMAGING - In an imaging method, periodic maintenance radio frequency pulses (α, −α) are applied to maintain a steady state magnetic resonance excitation in an imaging region. Readout (12-24-2009
20100148775STANDING WAVE BARRIER FOR A MAGNETIC RESONANCE TOMOGRAPHY DEVICE - A standing wave barrier, particularly for use in a magnetic resonance tomography device, has a body and an opening in the body that is fashioned to accommodate a cable, the opening being formed as an externally open groove along a longitudinal direction of the standing wave barrier, and is shaped so that the cable can glide in and out along the standing wave barrier through the groove.06-17-2010
20100148773WIDEBAND MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging (MRI) method is provided, including the steps of generating a wideband RF signal that has a plurality of frequency bands respectively corresponding to a plurality of different kinds of nuclei, to simultaneously excite the different kinds of nuclei, detecting a wideband responsive RF signal that has a plurality of frequency bands respectively emitted by the different kinds of nuclei, and reconstructing magnetic resonance images for the different kinds of nuclei based on the wideband responsive RF signal. An MRI apparatus employing the MRI method is also provided.06-17-2010
20100171496HIGHER-ORDER GENERALIZED SERIES PARALLEL IMAGING METHOD FOR ACQUIRING HIGH SPATIO-TEMPORAL RESOLUTION FUNCTIONAL MAGNETIC RESONANCE IMAGES - Disclosed area high-order generalized series parallel imaging method for acquiring high spatio-temporal resolution functional magnetic resonance images and a sampling method. The higher-order generalized series parallel imaging method for acquiring high spatio-temporal resolution functional magnetic resonance images includes: performing sampling of an input image in k-space; applying a high-order generalized series (HGS) reconstruction procedure to data acquired as the sampling result to acquire a first reconstructed image; and applying a parallel magnetic resonance reconstruction procedure to the first reconstructed image to acquire a second reconstructed image.07-08-2010
20100171495Apparatus for carrying out DNP-NMR measurements with a compensation configuration and method for designing the compensation configuration - An apparatus for DNP-NMR measurement on a sample (P), with a magnet configuration (M) for producing a magnetic field in a first working volume (V07-08-2010
20100156415MAGNETIC RESONANCE DEVICE AND METHOD - MRI device arranged to a) generate a series of MR echo signals from a nuclear spin series having two or more spectral lines by subjecting at least part of a body (06-24-2010
20100194388Magnetic resonance imaging (MRI) using spir and/or chess suppression pulses - A magnetic resonance imaging apparatus includes an imaging condition setting unit and an image data acquisition unit. The imaging condition setting unit sets an imaging condition applying first and second suppression pulses of which at least ones of types, center frequencies and frequency bands are different from each other. The first and the second suppression pulses frequency-selectively suppress at least one of fat and silicone. The image data acquisition unit acquires image data according to the imaging condition.08-05-2010
20100188084COMPARATIVE ANALYSIS OF PROTEIN CONFORMATIONS BY USING 2D NOESY NMR SPECTRA - The present disclosure provides a method for determining the relative conformations of a protein provided in different protein preparations, comprising steps of: (i) obtaining a first 2D NOESY NMR spectrum of a first protein preparation; (ii) obtaining a second 2D NOESY NMR spectrum of a second protein preparation; and (iii); determining whether a protein has a different conformation in the first and second protein preparations by comparing one or more cross-peaks in the first 2D NOESY NMR spectrum with one or more corresponding cross-peaks in the second 2D NOESY NMR spectrum.07-29-2010
20090115414PHASE-SENSITIVELY DETECTED REDUCED DIMENSIONALITY NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY FOR RAPID CHEMICAL SHIFT ASSIGNMENT AND SECONDARY STRUCTURE DETERMINATION OF PROTEINS - The present invention discloses eleven reduced dimensionality (RD) triple resonance nuclear magnetic resonance (NMR) experiments for measuring chemical shift values of certain nuclei in a protein molecule, where the chemical shift values encoded in a peak pair of an NMR spectrum are detected in a phase sensitive manner. The RD 3D 05-07-2009
20100182007ESTABLISHMENT OF PARAMETERS TO ADJUST A MAGNETIC FIELD SHIM FOR A MAGNETIC RESONANCE EXAMINATION OF A PATIENT - A fast, efficient, qualitatively high-grade shim is enabled in a magnetic resonance apparatus and a method to set shim parameters of a magnetic resonance apparatus, to prepare the implementation of a magnetic resonance examination of a patient with an imaging medical magnetic resonance apparatus having a displaceable patient bed, wherein an examination region of the patient that is to be examined is larger than an imaging region of the magnetic resonance apparatus.07-22-2010
20100182008System and Method for Embedded Self-Calibration within an Inversion Recovery Pulse Sequence - An improved self-calibration method for accelerated magnetic resonance imaging (MRI) using inversion recovery pulse sequences allows calibration data for determining coil sensitivity profiles to be acquired by employing a calibration pulse sequence within the delay time of an inversion recovery pulse sequence. The calibration pulse sequence includes a constrained number of calibration pulses having small flip angles so that acceptable longitudinal magnetization recovery is provided.07-22-2010
20100013477SLICE SELECTIVE MRI EXCITATION WITH REDUCED POWER DEPOSITION USING MULTIPLE TRANSMIT CHANNELS - Described are embodiments for slice-selective excitation for MRI that utilize multiple RF transmit coils, each of which are driven with a separate independent current waveform. These embodiments allow slice-selective excitation with slice profile and excitation time similar to other single-channel excitation, but with reduction in SAR caused by the transverse component of the RF field by a factor up to the number of excitation coils.01-21-2010
20100013480NUCLEAR MAGNETIC RESONANCE IMAGING DEVICE, AND IMAGING SYSTEM AND IMAGING METHOD USING THE SAME - A nuclear magnetic resonance imaging device 01-21-2010
20100188085SYSTEM AND METHOD FOR PROPELLER MAGNETIC RESONANCE IMAGING - A system and method include a computer readable storage medium having stored thereon a computer program comprising instructions which when executed by a computer cause the computer to apply a first plurality of radio frequency (RF) pulses during a first repetition time (TR) interval of a magnetic resonance (MR) pulse sequence. The instructions also cause the computer to apply a first plurality of gradient pulses and acquire the MR data during application of each gradient pulse of the first plurality of gradient pulses between an adjacent pair of RF pulses of the first plurality of RF pulses. Each gradient pulse of the first plurality of gradient pulses is configured to allow acquisition of MR data for a respective first bladelet passing through a center of k-space, wherein the first bladelets are non-parallel with each other. The instructions also cause the computer to reconstruct the acquired MR data into an image.07-29-2010
20100182006METHOD OF TIME-DOMAIN MAGNETIC RESONANCE IMAGING AND DEVICE THEREOF - The present invention relates to a method of time-domain magnetic resonance imaging and device thereof. The method includes transiently exciting a sample; receiving a signal emitted form the sample; and processing the received signal without Fourier transformation to acquire an image. The device includes an excitation device, a detecting coil and an operating circuit to process a received emitting signal and generating an image, wherein the received emitting signal is a time-domain signal free from Fourier transformation. The time of generating an image can be reduced dramatically by the present invention.07-22-2010
20100225317MULTI-CHANNEL METHOD AND DEVICE TO EVALUATE MAGNETIC RESONANCE SIGNALS, WITH REDUCED NUMBER OF CHANNELS - An optimized processing of data of multiple local coils is enabled by a device and a method to evaluate signals received with coils of a magnetic resonance tomography apparatus, wherein first signals are generated by means of coils via magnetic fields coming from a body, wherein a region in the body is defined, wherein weighting factors are calculated with the use of the first signals, wherein second signals are generated with the coils from magnetic fields coming from a body, wherein signals weighted with the use of the weighting factors are calculated from the second signals, wherein the weighted signals are processed further.09-09-2010
20130214781System and Method for Magnetic Resonance Imaging Water-Fat Separation with Full Dynamic Range Using In-Phase Images - A magnetic resonance imaging (“MRI”) system and method for producing an image of a subject with the MRI system in which signal contributions of water and fat are separated are provided. A plurality of in-phase echoes formed at a plurality of different echo times are sampled to acquire k-space data. The in-phase echoes include signal contributions from water and fat that are in-phase with each other. The signal contributions from water and fat are then separated by fitting only those echo signals that are in-phase echo signals to a signal model that models a fat spectrum as including multiple resonance peaks. From these signal contributions, an image of the subject depicting a desired amount of signal contribution from water and a desired amount of signal contribution is produced.08-22-2013
20100013479METHOD AND MAGNETIC RESONANCE SYSTEM TO EXCITE NUCLEAR SPINS IN A SUBJECT - In a method and system to generate an excitation in an examination subject to acquire magnetic resonance signals from a region of the examination subject, basic magnetic field is generated, an adiabatic half-passage (AHP) pulse is radiated to generate a transverse magnetization in the subject, and at least one first and one second adiabatic full-passage (AFP) pulse is radiated to generate a slice-selective rephasing of the transverse magnetization. The time interval between the first adiabatic half-passage pulse and the first adiabatic full-passage pulse is at least 37 ms, and the time interval between the first adiabatic full-passage pulse and the second adiabatic full-passage pulse is at least 75 ms.01-21-2010
20100013478MAGNETIC RESONANCE IMAGING DEVICE - A magnetic resonance imaging device includes magnetic field generating means and control means for controlling receiving means according to a predetermined pulse sequence, the predetermined pulse sequence including an unnecessary material suppressing sequence unit for canceling a signal from an unnecessary material which is not a measurement target and a main imaging sequence unit for measuring a nuclear magnetic resonance signal used to create an image of an examinee. The unnecessary material suppressing sequence unit generates at least two or more high frequency magnetic field pulses so that the longitudinal magnetization of the unnecessary material is made spatially uniform in the imaging space under application of a first high frequency magnetic field pulse in the main imaging sequence unit. The magnetic resonance imaging device further includes adjusting means for adjusting the flip angles of the two or more high frequency magnetic field pulses, and the control means applies the two or more high frequency magnetic field pulses at the flip angles adjusted by the adjusting means.01-21-2010
20100253336Method for obtaining amplitude and phase dependencies of RF pulses for spatially selective excitation - A method for obtaining amplitude and phase dependencies of radio frequency pulses, which are irradiated within the scope of a main magnetic resonance experiment for generating a predetermined n-dimensional spatial distribution (n>=1) of transverse magnetization in an object by means of at least one radio frequency transmitting antenna of a magnetic resonance measuring system in combination with spatially and temporally varying additional magnetic fields which are superimposed on the static and homogeneous base field of the magnetic resonance measuring system and change the transverse magnetization phase in the object in dependence on location and time is characterized in that, prior to performance of the main experiment, a preparational measurement is performed in which the change with time of the transverse magnetization phase in the object under the action of the additional magnetic fields is measured in a position-resolved fashion and the amplitude and phase dependencies of the radio frequency pulses for the main experiment are calculated on the basis of this change with time of the transverse magnetization phase, which is measured in a position-resolved fashion. In this fashion, experimental imperfections in the form of unintentional additional magnetic fields can be measured, taken into consideration and compensated for.10-07-2010
20100001726MAGNETIC RESONANCE IMAGING APPARATUS AND RECEIVING-PATH SWITCHING METHOD - In a magnetic resonance imaging apparatus, an event generating substrate included in a sequence control unit generates an event code to make an instruction for switching a receiving path during a scan based on scanning conditions that are set in advance of the scan. When the event code is generated, a radio-frequency switch-matrix substrate of a gantry unit switches the receiving path that connects a receiving coil and a receiving circuit.01-07-2010
20100237863METHOD AND DEVICE FOR CONTROLLING ACQUISITION OF MAGNETIC RESONANCE DATA IN A MAGNETIC RESONANCE APPARATUS - In a method and a device to control the workflow of an MR measurement in a magnetic resonance system, a predetermined volume segment is subdivided into parallel slices with a predetermined slice interval and measured with a continuous table feed. Apart from a start phase and an end phase of the MR measurement, multiple slices of the examination subject are excited and read out in every repetition of the underlying basic sequence, and these multiple slices are located in an active volume inside the magnetic resonance system. The number of slices excited and read out per repetition of the underlying basic sequence is selected automatically depending in particular on the parameters determining an image contrast and an image resolution, and thus cannot be freely set by a user of the magnetic resonance system.09-23-2010
20100237865MAGNETIC RESONANCE METHOD AND APPARATUS TO GENERATE AN IMAGE USING A PARALLEL ACQUISITION TECHNIQUE - In a magnetic resonance a method and apparatus to generate images by a parallel acquisition technique, a first echo train is generated after a first excitation pulse, wherein the first echo train sufficiently densely scans a segment of k-space to be scanned for an acquisition of coil calibration data. Coil calibration data are acquired by means of the first echo train after the first excitation pulse. The acquired coil calibration data are stored in a coil calibration data set. A second echo train is generated after a second excitation pulse, wherein the second echo train undersamples a segment of k-space to be scanned for an acquisition of image data. Image data are acquired by means of the second echo train after the second excitation pulse. The acquired image data are stored in an incomplete image data set. An image data set is generated by substituting data missing in the incomplete image data set due to the undersampling by means of a selected PAT reconstruction technique using the coil calibration data. The first echo train and the second echo train are generated by an identical sequence technique such that each echo train has a series of echoes, with a time interval of the echoes of a series of the first echo train being shorter than a time interval of the echoes of a series of the second echo train.09-23-2010
20100237864MAGNETIC RESONANCE METHOD AND APPARATUS TO GENERATE AN IMAGE USING A PARALLEL ACQUISITION TECHNIQUE - In a magnetic resonance method and apparatus to generate images by a parallel acquisition technique an excitation pulse is radiated into an examination subject, and a first echo train is generated after the excitation pulse, wherein the first echo train densely scans a segment of k-space to be scanned for an acquisition of coil calibration data. Coil calibration data are acquired by means of the first echo train. The acquired coil calibration data are stored in a coil calibration data set. A second echo train is generated after the same excitation pulse, wherein the second echo train undersamples a segment of k-space to be scanned for an acquisition of image data. Image data are acquired by means of the second echo train. The acquired image data are stored in an incomplete image data set. An image data set is generated by substituting data missing in the incomplete image data set due to the undersampling by means of a selected PAT reconstruction technique using the coil calibration data.09-23-2010
20100253342MAGNETIC RESONANCE IMAGING APPARATUS - An apparatus includes a unit which acquires, by a first sequence, an MR signal before administration of a contrast agent and which also acquires, by a second sequence, an MR signal after the administration, the first sequence dephasing a magnetization after RE excitation to make a greater signal reduction in a first signal component regarding a fluid flowing within a first range than in a second signal component regarding the fluid flowing within a second less than the first range, the second sequence bringing the MR signal after the administration to a level corresponding to the concentration of the agent, a unit which reconstructs first and second images, and a unit which generates a third image on the basis of the first and second images, the third image showing the degree of a change of the fluid after the administration from a state before the administration.10-07-2010
20100253341PULSE GAP CYCLING FOR IMPROVED SWIFT - A magnetic resonance image is produced by shifting a gap during acquisition of spin data for a specimen. The spin data is generated by a gapped excitation sequence.10-07-2010
20100225316METHOD AND APPARATUS FOR ENHANCED IN VIVO MRI IMAGING - A method and apparatus for detecting the presence of abnormal tissues of the present invention utilizing a magnetic resonance imaging system in communication with a computer. The apparatus is configured to define a confidence region using a probability based confidence interval calculation such as multivariate or bivariate analysis for at least two parameters in a normal tissue sample by making a magnetic resonance image, and then to evaluate a second sample by making a magnetic resonance image. Parameters detectable by magnetic resonance imaging 09-09-2010
20100225319DETERMINING PHASE-ENCODING DIRECTION FOR PARALLEL MRI - Example systems, methods, and apparatus associated with determining a phase-encoding direction for parallel MRI are described. One example, method includes selecting a set of projection directions along which an MRI apparatus is to apply RF energy to an object to be imaged. The method includes controlling the MRI apparatus to selecting a set of projection directions and to acquire MR signal from the object through a set of detectors. The method includes analyzing the MR signal to identify individual sensitivities for members of the set of detectors and selecting a phase-encoding direction for a pMRI session based on the individual sensitivities for the members. The method produces a concrete, tangible, and useful result by controlling the MRI apparatus to perform the pMRI session based on the selected phase-encoding direction.09-09-2010
20120194185METHOD AND SYSTEM FOR DETERMINING A MAGNETIC RESONANCE SYSTEM ACTIVATION SEQUENCE - A method and control sequence determination facility for determining a magnetic resonance system activation sequence that includes a multichannel pulse train with a plurality of individual HF-pulse trains to be emitted by the magnetic resonance system via different independent high-frequency transmit channels of a transmit facility in a parallel manner are described. The multichannel pulse train is calculated based on a k-space gradient trajectory and a predetermined target magnetization using an HF pulse optimization method. In the HF pulse optimization method, optimization of the multichannel pulse train and/or the k-space gradient trajectory takes account of at least one hardware operating parameter of the transmit facility.08-02-2012
20100237862Mitigating Off-Resonance Angle In Steady-State Coherent Imaging - Systems, methods, and other embodiments associated with mitigating off-resonance angle in steady-state coherent magnetic resonance imaging (MRI) are described. One example method includes accessing a B0 map and a coil sensitivity profile associated with an MRI apparatus configured to produce a steady-state coherent MRI sequence to image an object. The MRI apparatus is configured with a multi-channel transmission array having individually controllable transmission channels. The method includes computing transmission control parameters for individual transmission channels as a function of the B0 map and the coil sensitivity profile. The transmission control parameters are configured to facilitate controlling the transmission array to create a spatially varying phase profile using a single dimensional radio frequency (RF) pulse.09-23-2010
20100237866MAGNETIC RESONANCE CONTRAST USING FICTITIOUS FIELD RELAXATION - A system includes a signal generator and a processor. The signal generator is configured to couple with a magnetic resonance transmitter coil. The processor is configured to execute instructions to control the signal generator. The instructions include forming a sequence of waveforms. The sequence is configured to generate spin relaxation in a fictitious field in a third rotating frame of reference based on at least one magnetic field component that arises based on an effective field in a second rotating frame of reference. The third rotating frame of reference is of a higher order than the second rotating frame of reference and the second rotating frame of reference is of a higher order than the first rotating frame of reference.09-23-2010
20120126811Methods and apparatuses for 3D magnetic density imaging and magnetic resonance imaging - Methods and apparatuses for 3D tomographic imaging of objects such as soft-tissues in humans are disclosed. They are similar to the Magnetic Resonance Imaging (MRI) methods and apparatuses but they are based on the new Field Paradigm founded on the principle that the field intensity distribution in a 3D volume space uniquely determines the 3D density distribution of the field emission source and vice versa. The object to be imaged is first magnetized by a polarizing magnetic field pulse. The magnetization of the object is specified by a 3D spatial Magnetic Density Image (MDI) that needs to be determined. The magnetic field due to the magnetized object is measured in a 3D volume space that extends in all directions and in particular substantially along the radial direction from the center of the object being imaged. Further, magnetic field intensity may be measured along multiple directions at each point. This measured data captures all the available information and facilitates fast and accurate 3D image reconstruction. This is unlike prior art where measurements are made only on a surface at a nearly constant radial distance from the center of the target object. Therefore useful and available data is ignored and not measured in prior art. Consequently, prior art does not provide a fast and accurate solution to 3D imaging. The methods and apparatuses of the present invention are combined with frequency and phase encoding techniques of MRI in prior art to achieve different trade-offs.05-24-2012
20100253339MAGNETIC RESONANCE APPARATUS AND METHOD TO DETECT INCORRECT MAGNETIC RESONANCE DATA - In a method and apparatus to detect incorrect MR data in k-space representing MR signals acquired from an examination subject with at least two acquisition coils, MR data are acquired to generate at least one raw data set with each of the at least two acquisition coils and a check is made, for at least one k-space point, as to whether the MR data acquired for this k-space point should be replaced or not. In the event that the check yields that the MR data acquired for the at least one k-space point should be replaced, the MR data are replaced with reconstructed MR data that are based on at least two of the acquired raw data sets.10-07-2010
20100253338MAGNETIC RESONANCE METHOD AND APPARATUS FOR REDUCING RF HEATING IN THE PATIENT - In a magnetic resonance data acquisition method and system for acquiring data from a patient who carries, either intracorporeally or extracorporeally, a foreign object at least partially composed of electrically conductive material, RF heating to the patient due to the presence of the foreign object is minimized by radiating the patient with RF energy by an RF coil that has a coil design. The sequence of pulses to which the patient is subjected to acquire magnetic resonance data from the patient is configured, in combination with the coil design of the RF coil to steer or modify the electric field that arises in the patient so that RF heating in the patient due to the presence of the foreign object is minimized.10-07-2010
20100253344MAGNETIC RESONANCE METHOD AND APPARATUS TO DETERMINE K-SPACE POSITIONS FOR MODELING RADIO-FREQUENCY PULSES - In a method magnetic resonance apparatus for the determination of k-space positions for modeling of RF pulses for magnetic resonance excitations, the following steps are implemented: 10-07-2010
20100253337METHOD AND SYSTEM FOR PROVIDING MICROSTRUCTURAL INFORMATION OF A BIOLOGICAL TARGET - A method is adapted for providing microstructural information of a biological target from a plurality of diffusion weighted MR images corresponding to a specific area of the biological target. Each of the diffusion weighted MR images is obtained using a respective q-space sampling vector and is sampled at a plurality of sample points thereof to obtain a group of diffusion weighted MR image data. The diffusion weighted MR image data are processed to obtain a spin distribution function from which the microstructural information of the biological target can be obtained.10-07-2010
20100244826Device for monitoring a living object during a magnetic resonance experiment - A device for monitoring a living object during a magnetic resonance (MRI) experiment in an MRI tomograph, wherein the device comprises one or more individual electrodes which are connected in an electrically conducting fashion to the living object to be examined, and are connected to a monitoring device via signal lines, wherein each signal line comprises individual parts that are electrically connected to each other via impedances. The eigenfrequencies of these parts are higher than the NMR measuring frequency, preferably more than twice as high, and the parts are electrically connected to each other via frequency-dependent impedances Z09-30-2010
20100207628MAGNETIC RESONANCE METHOD AND APPARATUS FOR DETERMINING THE MAGNETIZATION TRANSFER CONSTANT IN SPIN ECHO IMAGING SEQUENCES - In a magnetic resonance method and apparatus for determining a magnetization transfer constant a first MR signal sequence is acquired from an object being examined using a spin echo based imaging sequence, a second MR signal sequence is acquired from the object being examined using a spin echo based imaging sequence having basically identical imaging parameters to the first MR signal sequence, with the exception that the energy level of the RF pulses for exciting the magnetization in the first MR signal sequence and the energy level of the RF pulses for exciting the magnetization in the second MR signal sequence are different. The magnetization transfer constant is determined based on the signal differences between the first and second MR signal sequences.08-19-2010
20100253340ADIABATIC MAGNETIZATION PREPARATION FOR B1 AND B0 INSENSITIVE HIGH CONTRAST MRI - A magnetic resonance image is produced by radial imaging using one or more preparatory pulses. The magnetic preparation pulse can include one or more adiabatic pulses.10-07-2010
20100123460MAGNETIC RESONANCE TOMOGRAPHY METHOD AND APPARATUS WITH SEPARATION OF FAT AND WATER IMAGES ACCORDING TO THE TWO-POINT DIXON METHOD DEPENDENT ON T*2 DECAY - In a magnetic resonance tomography method and apparatus for separation of fat and water images according to the two-point Dixon method dependent on the T*05-20-2010
20100253335METHOD FOR IMAGE DATA ACQUISITION WITH A MAGNETIC RESONANCE DEVICE - In a method for image data acquisition of a region of interest in a subject with a magnetic resonance device, wherein, to establish the field of view, a minimal geometric shape encompassing the subject to be acquired and/or the surface of the subject is determined automatically from previously acquired localizer exposures as aliasing information for each exposure, at least one slice plane is determined for the acquisition of the region, and the phase coding direction and/or the extent of the field of view in the phase coding direction is determined for every slice plane using the aliasing information.10-07-2010
20110057652SCALABLE MULTICHANNEL TRANSMITTER SYSTEM FOR AN MR TRANSMISSION ARRAY - A flexible design of a transmission system for a magnetic resonance tomography apparatus has multiple radio-frequency control units, connectors that are connected to the radio-frequency control units, a unit to which at least one first connector is connected, which connector is also connected to a first radio-frequency control unit of the radio-frequency control units. The unit is connected via a connector to only some—in particular only one—of the radio-frequency control units. One of these few radio-frequency control units is connected to an additional radio-frequency control unit via an additional connector.03-10-2011
20100141253MAGNETIC RESONANCE IMAGING APPARATUS - An MRI apparatus includes an imaging means being provided with a means for generating magnetic fields respectively of a static magnetic field, a gradient magnetic field, and an RF magnetic field, and a means for receiving an echo signal generated from a subject, the imaging means being for measuring echo data associated with at least one measurement trajectory in k-space, while varying angles with respect to a coordinate axis in the k-space of the measurement trajectory, so as to collect at least one measured data for each of the angles; and an image reconstruction means for rearranging the measured data in the k-space and reconstructing an image; wherein, the image reconstruction means calculates a phase for correction based on standard data selected from the measured data for each of the angles, prior to rearranging the measured data in the k-space, and performs a phase correction as to the measured data, by using the phase for correction being calculated. With the procedure above, it is possible to reduce an artifact caused by the nonlinearity of the gradient magnetic field and/or inhomogeneities of the magnetic field, without extending the imaging time.06-10-2010
20100085050SPECTRAL RESOLUTION ENHANCEMENT OF MAGNETIC RESONANCE SPECTROSCOPIC IMAGING - A method and apparatus for enhancing the spectral resolution of magnetic resonance spectroscopic (MRS) measurements include receiving time domain echo data from an MRS measurement for an MRS volume in a subject. Also received are high spatial resolution complex signal values within the MRS volume based on magnetic resonance imaging (MRI) measurements. Frequency-domain content is determined for the echo data based at least in part on the complex signal values. For example, in some embodiments, receiving complex signal values includes receiving high spatial resolution complex signal values within the MRS volume for each of two different echo time settings. The frequency-domain content of the echo data is corrected for a lineshape profile based on high resolution frequency dispersion values for the MRS volume determined from differences in the complex signal values for the two different echo time settings.04-08-2010
20100117646MAGNETIC RESONANCE SCANNER WITH WIRELESS TRANSMISSION OF SIGNALS - A wireless magnetic resonance imaging scanner has one or more local coils, a microwave antenna array, and a local oscillator, and an upconverter. The local oscillator signal from the local oscillator is transmitted from the microwave antenna array to illuminate the local coils. The local coils generate magnetic resonance signals at a first frequency and the magnetic resonance signals at the first frequency are upconverted in the upconverter to microwave frequencies. The local oscillator operates at a frequency within an unlicensed band, chosen such that desired sidebands for reception of the upconverted local coil magnetic resonance signals fall outside the unlicensed band.05-13-2010
20100219830MAGNETIC RESONANCE IMAGING APPARATUS, METHOD AND PROGRAM OF MAGNETIC RESONANCE IMAGING - A magnetic resonance imaging apparatus includes a gradient coil, a transmission coil, an electrocardiographic signal detecting device detecting an electrocardiographic signal from a subject, a controlling device controlling the gradient coil and the transmission coil so that a pulse sequence including a preparation pulse and a data acquisition sequence for acquiring data from a subject utilizing a magnetic resonance phenomenon is repeatedly carried out, and a cardiac phase computing device computing the cardiac phase of the subject based on the electrocardiographic signal. The controlling device determines whether or not to re-acquire data once acquired from the subject based on the cardiac phase of the subject at an arbitrary time in a period during which the pulse sequence is carried out or the cardiac phase of the subject at a time after the pulse sequence is terminated.09-02-2010
20100219829LONG T1 ARTIFACT SUPPRESSION TECHNIQUES FOR MAGNETIC RESONANCE IMAGING - A method of suppressing artifacts arising from tissue, fluids, or other long-T1 species when acquiring magnetic resonance data with a segmented pulse sequence that assumes that magnetization is at steady state, said method including suppressing artifacts by producing an artifact suppression module (ASM) before the segmented sequence, the artifact suppression module comprising at least one selective, non-selective, or volume-selective suppression pulse and a time delay.09-02-2010
20080309335SYSTEM AND METHOD FOR INCREASING SPECTROSCOPIC SIGNAL - A method for increasing a spectroscopic signal in a biological assay is provided. The method includes forming a suspension of magnetically attractable particles. The method also includes introducing a first magnetic field at a first location to draw the magnetically attractable particles towards the first location and form a first agglomeration. The method also includes removing the first magnetic field. The method further includes introducing a second magnetic field at a second location to draw the first agglomeration towards the second location and form a second agglomeration. The method further includes focusing an excitation source on the second agglomeration formed at the second location.12-18-2008
20100219831MAGNETIC RESONANCE METHOD CONTROL DEVICE AND SYSTEM FOR IMAGING A VOLUME SEGMENT OF A SUBJECT - For imaging a volume segment by means of a magnetic resonance system, of the volume segment is transferred into a dynamic steady state relative to the magnetization by means of the magnetic resonance system. The following steps are repeatedly executed until the volume segment has been completely measured. The slice is excited by means of the magnetic resonance system. MR signals of the slice are read out. The slice is offset in an overlapping manner such that an overlap range is created by the slice before the offset and the slice after the offset, the overlap range being a predetermined percentile of both the slice before the offset and the slice after the offset.09-02-2010
20090322328E-field imaging and proximity detection using a spatially and temporally modulated source - A method and apparatus is described to image a body using electric fields. The electric field is apply to the body from a well controlled electron beam that deposits charge on a glass plate at a particular time and spatial location. This is demonstrated by using the ubiquitous CRT computer monitor. The method is useful in medical imaging and for nondestructive testing. An advantage of the electric field imaging is it requires no ionizing radiation. The use of the computer display allows for proximity detection of a body. A smart control is drawn on the video screen by a program. The control produces and E-field source that occurs at known time in the video refresh. A proximate E-field sensor is used to detect the changes in the signal produced by the button. Changes in the signal level are associated with a proximate body to the button. Detection logic is used to instigate the action of the control.12-31-2009
20090322330MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes an imaging condition acquisition unit and an imaging unit. The imaging condition acquisition unit acquires at least one of an amplitude and a phase of a radio frequency transmission signal so as to reduce a deviation of data in at least one region of interest set in an object. The imaging unit acquires image data by imaging according to an imaging condition including at least the one of the amplitude and the phase.12-31-2009
20090039885METHOD AND APPARATUS FOR ACQUISITION OF MAGNETIC RESONANCE DATA - In a magnetic resonance method and apparatus for acquisition of measurement data from a subject, k-space to be scanned into an inner region and an outer region, and the inner region is divided into inner segments that differ in terms of their distance from a k-space center and the outer region is divided into outer segments that differ in terms of their distance from a k-space center. First k-space data are acquired for the inner region, wherein k-space lines of the inner region are divided into first groups such that k-space lines from different inner segments are associated in each of the first groups, and the first groups are successively scanned. Second k-space data are acquired for the outer region, wherein k-space lines of the outer region are divided into second groups such that k-space lines from different outer segments are associated in each of the second groups, and the second groups are successively scanned.02-12-2009
20090072826MAGNETIC RESONANCE IMAGING WITH BIPOLAR MULTI-ECHO SEQUENCES - A method for magnetic resonance imaging (MRI) is provided. A magnetic resonance excitation is provided. A plurality of k-space echoes is acquired bi-directionally wherein at least one echo is an even echo acquired in a first direction and at least one echo is an odd echo acquired in a second direction opposite from the first direction. K-space echo realignment is corrected between the even and odd echoes. Field inhomogeneity induced artifacts are corrected. Chemical shift induced artifacts between at least two species are corrected.03-19-2009
20090072827INDEPENDENT PHASE MODULATION FOR EFFICIENT DUAL-BAND 3D IMAGING - A method for magnetic resonance imaging (MRI) a first volume and a second volume spaced apart from the first volume is provided. The first volume is excited with a first linearly varying phase with respect to k-space. The second volume is excited with a second linearly varying phase with respect to k-space, wherein the first linearly varying phase has a different slope than the second linearly varying phase. Data in k-space is acquired line by line. The acquired data in k-space is Fourier transformed to image space. An image is formed with a first volume image and a second volume image from the transformed data. Use of phase modulation allows imaging with a reduced field-of-view, which can result in faster scan times or improved performance of parallel imaging acquisition strategies.03-19-2009
20090115415SYSTEM AND METHOD FOR USE OF NANOPARTICLES IN IMAGING AND TEMPERATURE MEASUREMENT - This invention provides a system and method that improves the sensitivity and localization capabilities of Magnetic Particle Imaging (MPI) by using combinations of time-varying and static magnetic fields. Combinations of magnetic fields can be used to distribute the signals coming from the magnetic particles among the harmonics and other frequencies in specific ways to improve sensitivity and to provide localization information to speed up or improve the signal-to-noise ratio (SNR) of imaging and/or eliminate the need for saturation fields currently used in MPI. In various embodiments, coils can be provided to extend the sub-saturation region in which nanoparticles reside; to provide a static field offset to bring nanoparticles nearer to saturation; to introduce even and odd harmonics that can be observed; and/or to introduce combinations of frequencies for more-defined observation of signals from nanoparticles. Further embodiments provide for reading of the signal produced by cyclically saturated magnetic nanoparticles in a sample so as to provide a measurement of the temperature of those nanoparticles. The spectral distribution of the signal generated provides estimates of the temperature of the nanoparticles. Related factors may also be estimated—binding energies of the nanoparticles, phase changes, bound fraction of the particles or stiffness of the materials in which the nanoparticles are imbedded.05-07-2009
20090115413DEVICE AND METHOD FOR PARALLEL MAGNETIC RESONANCE IMAGING - The invention relates to a device (05-07-2009
20110031971CONTRAST AGENT-FREE MR ANGIOGRAPHY WITH SSFP SEQUENCES - In a method to generate an MR angiography image of an examination region of a subject without the use of contrast agent, a first MR image of the examination region is acquired with a first imaging sequence in which a gradient-induced phase development for unmoved and moved spins is essentially completely rephased at the end of a repetition interval TR, and a second MR image of the examination region is acquired with a second imaging sequence in which the gradient-induced phase development for unmoved spins is likewise essentially completely rephased at the end of the repetition interval TR and a rest phase φ02-10-2011
20110031970Magnetic Resonance Imaging Apparatus - The present invention provides a vertical magnetic field MRI apparatus which is capable of speeding up imaging for taking an image of any cross section of a wide area such as a total body, while suppressing increase of the number of channels and maintaining high sensitivity in a deep portion of a subject. A receiver coil unit 02-10-2011
20080265884Magnetic resonance imaging apparatus and magnetic resonance imaging method - A magnetic resonance imaging apparatus includes an imaging condition setting unit and an image acquisition unit. The imaging condition setting unit includes an input part for inputting an imaging condition with applying plural pre-pulses. The image acquisition unit performs imaging according to the imaging condition and generates an image based on data acquired by the imaging. The imaging condition setting unit includes a display part configured to display an application region and attribute information of at least one pre-pulse of the plural pre-pulses together with a position of the imaging.10-30-2008
20080231274METHOD TO CONTROL A MAGNETIC RESONANCE SYSTEM - In a method for controlling a magnetic resonance system having a radio-frequency antenna structure and a number of individually controllable transmission channels, respective parallel radio-frequency signals are emitted via the transmission channels for generation of a desired radio-frequency field distribution in at least one specific volume region within an examination volume of the magnetic resonance system. A digital signal is generated for each of the transmission channels and is modulated on a carrier frequency. The radio-frequency signal so generated is transmitted via a radio-frequency signal path to the radio-frequency antenna structure and is amplified therein in a radio-frequency power amplifier. The digital signal is manipulated in a characteristic curve correction device on the basis of a correction characteristic curve predetermined for the respective radio-frequency signal path such that a distortion of the radio-frequency signal caused in the appertaining radio-frequency signal path is at least partially compensated. Respective individual correction characteristic curves for a specific measurement are predetermined for the various transmission channels dependent on a field distribution parameter that defines the desired radio-frequency field distribution. A magnetic resonance system implements such a method.09-25-2008
20080231275MAGNETIC RESONANCE METHOD AND APPARATUS FOR AUTOMATICALLY DETERMINING OBJECTS THAT ATTENUATE PENETRATING RADIATION - In a method and an apparatus for automatic determination of objects that attenuate high energy/penetrating radiation by magnetic resonance, the magnetic resonance apparatus scans and prepares MR images, and the MR images contain information about the T2 relaxation time constant. Subsequently, penetrating radiation-attenuating objects are determined in the MR images by means of the T2 relaxation time constant.09-25-2008
20120032676Spatial intensity correction for RF shading non-uniformities in MRI - An MRI MAP prescan data from a predetermined imaged patient volume is decomposed to produce a transmit RF field inhomogeneity map and a receive RF field inhomogeneity map for the imaged patient volume based on a three-dimensional geometrical model of the inhomogeneity maps. At least one of the transmit RF field inhomogeneity map and the receive RF field inhomogeneity map is used to generate intensity-corrected target MRI diagnostic scan image data representing the imaged patient volume.02-09-2012
20100301860SYSTEM, METHOD AND COMPUTER-ACCESSIBLE MEDIUM FOR PROVIDING BREATH-HOLD MULTI-ECHO FAST SPIN-ECHO PULSE SEQUENCE FOR ACCURATE R2 MEASUREMENT - Exemplary embodiments of system, method and computer-accessible medium can be provided in accordance with the present disclosure can be provided for generating a plurality of images associated with at least one anatomical structure using magnetic resonance imaging (MRI) data. For example, using such exemplary embodiments, it is possible to obtain at least one multi-echo fast spin-echo (FSE) pulse sequence based on the MRI data, which can include, e.g., hardware specifications of the MRI system. Further, it is possible to generate each of the images based on a particular arrangement of multiple echoes produced by the multi-echo FSE pulse sequence(s).12-02-2010
20100301859Method and Apparatus for Correcting B1-Inhomogeneities in Nuclear Magnetic Resonance Imaging - A method of performing nuclear magnetic resonance imaging of a body (B), comprising: immerging said body in a static magnetic field B0 for aligning nuclear spins along a magnetization axis; exposing it to a transverse radio-frequency pulsed field Bi for flipping said nuclear spins by a predetermined angle; and detecting a signal emitted by flipped nuclear spins; the method being characterized in that it comprises the preliminary steps of: (i) determining a statistical distribution of the amplitude of said radio-frequency pulsed field within a volume of said body; and (ii) computing a set of optimal parameters of a composite radio-frequency pulsed field for jointly minimizing the dispersion of the spin flip angles distribution within said volume of the body, due to B1 and possibly B0 inhomogeneities, and the errors between the actual spin flip angles and their predetermined target value, wherein said radio-frequency pulsed field consists of a train of elementary pulses having a constant frequency and amplitude, and a continuous phase, and said parameters comprise: the number of said elementary pulses, as well as the duration, amplitude, frequency and relative initial phase of each of them.12-02-2010
20100301857Multiplex imaging systems, devices, methods, and compositions including ferromagnetic structures - Multiplex imaging systems, devices, methods, and compositions are provided. A nuclear magnetic resonance imaging composition includes, but is not limited to, a plurality of ferromagnetic microstructures configured to generate a time-invariant magnetic field within at least a portion of one or more internal surface-defined voids.12-02-2010
20100301856Systems, devices, methods, and compositions including functionalized ferromagnetic structures - Magnetic resonance systems, devices, methods, and compositions are provided. A nuclear magnetic resonance imaging composition includes, but is not limited to, a plurality of functionalized ferromagnetic microstructures configured to generate a time-invariant magnetic field within at least a portion of one or more internal surface-defined voids.12-02-2010
20100301861MRI Apparatus - An MRI apparatus including a magnetic structure defining a cavity for receiving a body under examination or a part thereof, a mechanism for generating a magnetic field inside the cavity, a mechanism for causing the body under examination or a part thereof to emit nuclear magnetic resonance signals, and a mechanism for receiving the nuclear magnetic resonance signals. The mechanism for generating the magnetic field includes one or more elements made of permanently magnetized material of the so-called superconducting bulk material type and, in combination therewith, a mechanism for keeping the magnetization condition of the superconducting bulk material which includes mechanisms for maintaining the temperature of the permanently magnetized material below the critical temperature thereof and for restoring the magnetization of the superconducting bulk material upon a complete or partial demagnetization.12-02-2010
20100301858NMR Diagnostics by Means of a Plastic Sample Container - Sample containers and methods for employing the same in in-vitro nuclear magnetic resonance measurements are provided. The sample containers are made of a material that comprises one or more polymeric materials.12-02-2010
20130141098Alignment Phantom for MR/PET System - A phantom for co-registering a magnetic resonance image and a nuclear medical image is disclosed. The phantom includes a longitudinal member having a first end cap and a second end cap and a chamber contained within the longitudinal member. The chamber contains a fluid for producing a first image using a first imaging modality. The phantom further includes a first rod disposed within the chamber of the longitudinal member. The first rod contains a radioactive substance for producing a second image using a second imaging modality.06-06-2013
20100321017ULTRAHIGH TIME RESOLUTION MAGNETIC RESONANCE - Ultrahigh time resolution magnetic resonance is achieved in a flow-through device such as a microfluidic chip by imaging along the flow dimension. Position within the one-dimensional image may be related to time by the flow velocity. Thus, a time resolution corresponding to the one-dimensional image resolution is obtainable.12-23-2010
20100134105Method For Reducing Maximum Local Specific Absorption Rate In Magnetic Resonance Imaging - A method for reducing maximum local specific absorption rate (“SAR”) in a magnetic resonance imaging (“MRI”) system is disclosed. More specifically, a plurality of candidate radio frequency (“RF”) pulses are designed and the manner in which they are applied to a subject is determined such that the maximum local SAR is substantially reduced relative to applying the candidate RF pulse that produces the lowest maximum local SAR alone. Put another way, this “time-multiplexing” of a set of RF pulses that each produce approximately the same excitation pattern yields a lower maximum local SAR than does transmitting the individual RF pulse having the lowest local SAR over many repetition times (“TRs”). A convex optimization method is utilized to determine the manner in which the RF pulses are multiplexed in time such that a substantially lower maximum local SAR is achieved.06-03-2010
20110001477Method for nuclear magnetic resonance (NMR) spectroscopy measurements using long-lived coherences (LLC) - A method for nuclear magnetic resonance (NMR) spectroscopy of a sample comprises preparation of the sample and carrying out an NMR spectroscopy measurement. Preparation includes excitation of long lived coherences (LLC) between the singlet state S01-06-2011
20110001478MAGNETIC RESONANCE IMAGING OF LIVING SYSTEMS BY REMOTE DETECTION - A novel approach to magnetic resonance imaging is disclosed. Blood flowing through a living system is prepolarized, and then encoded. The polarization can be achieved using permanent or superconducting magnets. The polarization may be carried out upstream of the region to be encoded or at the place of encoding. In the case of an MRI of a brain, polarization of flowing blood can be effected by placing a magnet over a section of the body such as the heart upstream of the head. Alternatively, polarization and encoding can be effected at the same location. Detection occurs at a remote location, using a separate detection device such as an optical atomic magnetometer, or an inductive Faraday coil. The detector may be placed on the surface of the skin next to a blood vessel such as a jugular vein carrying blood away from the encoded region.01-06-2011
20110001476PHASE SENSITIVE RADIO FREQUENCY MAPPING FOR MAGNETIC RESONANCE IMAGING - The disclosure provides phase-sensitive methods of radio frequency field mapping (e.g., B01-06-2011
20110109309TECHNIQUES FOR CORRECTING MEASUREMENT ARTIFACTS IN MAGNETIC RESONANCE THERMOMETRY - Techniques for correcting measurement artifacts in MR thermometry predict or anticipate movements of objects in or near an MR imaging region that may potentially affect a phase background and then acquire a library of reference phase images corresponding to different phase backgrounds that result from the predicted movements. For each phase image subsequently acquired, one reference phase image is selected from the library of reference phase images to serve as the baseline image for temperature measurement purposes. To avoid measurement artifacts that arise from phase wrapping, the phase shift associated with each phase image is calculated incrementally, that is, by accumulating phase increments from each pair of consecutively scanned phase images.05-12-2011
20110210735MRI APPARATUS AND METHOD WITH MOVING FIELD COMPONENT - Apparatus for use in a magnetic resonance imaging system, the imaging system generating a magnetic imaging field in an imaging region (09-01-2011
20110109312MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, an MRI apparatus includes an image generating unit and an SAR calculating unit. The image generating unit receives a magnetic resonance signal generated as a result of transmission of an RF pulse from an object, and generates image data of the object based on the magnetic resonance signal. The SAR calculating unit performs a correction operation on an energy control value of the RF pulse according to an imaging condition, and calculates an SAR value based on an energy value subjected to the correction operation.05-12-2011
20110109310DIGITAL NMR SIGNAL PROCESSING SYSTEMS AND METHODS - In some embodiments, a nuclear magnetic resonance (NMR) receiver using digital downconversion and subsampling tracks transmit and/or receive signal phases according to time(s) elapsed since reference times (e.g. reset times) corresponding to known phases. Carrier-frequency (f05-12-2011
20130147478Magnetic Resonance Imaging Using Steering-Propeller - A GRASE-type PROPELLER sequence called Steer-PROP is disclosed. This sequence exploits a serious of steer blips together with rewinding gradient pulse to traverse k-space. Steer-PROP improves the scan time by a factor of 3 or higher compared to FSE-PROPELLER, provides improved robustness to off-resonance effects compared to EPI-PROPELLER, and addresses a long-standing phase correction problem inherent to GRASE based sequences. Steer-PROP also enables intra-blade, inter-blade, and inter-shot phase errors to be separately determined and independently corrected.06-13-2013
20110025327METHOD FOR RADIOFREQUENCY MAPPING IN MAGNETIC RESONANCE IMAGING - A method of mapping a radio frequency magnetic field transmitted to a magnetic resonance imaging specimen. The method comprises the steps of: applying a first radio frequency pulse having a first excitation angle to the specimen and at a first time period after applying the first pulse applying one or more second radio frequency pulses each having a second excitation angle to the specimen, with a second time period between second pulses, to obtain a first data set defining a first sample of an image space; applying one or more third radio frequency pulses each having a third excitation angle to the specimen, with a third time period between third pulses, to obtain a second data set defining a second sample of the image space; applying one or more fourth radio frequency pulses each having a fourth excitation angle to the specimen, with a fourth time period between fourth pulses, to obtain a third data set defining a third sample of the image space; wherein the fourth excitation angle is different to the third excitation angle and/or the fourth time period is different to the third time period; calculating a magnetic field map data from at the three data sets; and outputting the magnetic field map data.02-03-2011
20110241675O-SPACE IMAGING - In MRI by excitation of nuclear spins and measurement of RF signals induced by these spins in the presence of spatially-varying encoding magnetic fields, signal localization is performed through recombination of measurements obtained in parallel by each coil in an encircling array of RF receiver coils. Through the use of magnetic gradient fields that vary both as first-order and second-order Z2 spherical harmonics with position, radially-symmetric magnetic encoding fields are created that are complementary to the spatial variation of the encircling receiver coils. The resultant hybrid encoding functions comprised of spatially-varying coil profiles and gradient fields permits unambiguous localization of signal contributed by spins. Using hybrid encoding functions in which the gradient shapes are thusly tailored to the encircling array of coil profiles, images are acquired in less time than is achievable from a conventional acquisition employing only first-order gradient fields with an encircling coil array.10-06-2011
20090066329MAGNETIC RESONANCE IMAGING APPARATUS AND NAVIGATOR DATA ANALYZING METHOD - A magnetic resonance imaging apparatus executes scans for executing a navigator sequence for acquiring as navigator data a magnetic resonance signal from a navigator area containing tissues body-moved in a subject and executing an imaging sequence for acquiring a magnetic resonance signal from an imaging area as imaging data at the subject, thereby to generate an image with respect to the imaging area. The magnetic resonance imaging apparatus includes, a phase profile generating part which generates a phase profile so as to show a relationship between a phase of the navigator data and a position of the navigator area, a phase correcting part which corrects folding back of the phase profile generated by the phase profile generating part, and a position detecting part which detects a position of a tissue body-moved in the navigator area, based on the phase profile corrected by the phase correcting part.03-12-2009
20090066328Nuclear Magnetic Resonance Imaging Apparatus and Method - A control means controls an imaging means for taking an image of a test object by a magnetic resonance, the test object being placed in an imaging space, and a transfer means that moves the test object, and on the basis of a difference (moving distance) between a position of the transfer means at the time of receiving a command of pausing the imaging and a position of the transfer means at the time of resuming the imaging, the control means controls the position of the transfer means or the position for imaging at the time of resuming, in such a manner that missing of data 03-12-2009
20110018537Interleaved Single Magnetic Resonance Sequence for MR Quantification - A magnetic resonance sequence includes an interleaved slice-selective pre-pulse and a slice-selective multi-echo acquisition. This sequence is repeated with different delays between the pre-pulse and the acquisition resulting in a matrix of complex images. Based on this matrix T1 and T2 relaxations, proton density and the B1 field can be estimated. These quantified parameters enable synthetic magnetic resonance imaging (MRI) and form a robust input for tissue segmentation in computer aided diagnosis for MRI.01-27-2011
20110109311NOISE CANCELING IN-SITU NMR DETECTION - Technologies applicable to noise canceling in-situ NMR detection and imaging are disclosed. An example noise canceling in-situ NMR detection apparatus may comprise one or more of a static magnetic field generator, an alternating magnetic field generator, an in-situ NMR detection device, an auxiliary noise detection device, and a computer.05-12-2011
20110037467MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus includes: a pair of static magnetic field generators separately disposed at the top and bottom of an imaging space in which a subject is placed; a shim magnetic material, disposed on the imaging-space side of each of the pair of static magnetic field generators, for generating a magnetic field to adjust the static magnetic field; a gradient magnetic field generator; a high-frequency magnetic field generator; a temperature sensor for directly or indirectly measuring the temperature of the shim magnetic material; and a controller for controlling the gradient magnetic field generator and the high-frequency magnetic field generator to execute an imaging pulse sequence. The controller determines the inhomogeneity of the static magnetic field from the output of the temperature sensor, considering the change in a magnetic field adjustment parameter due to the temperature change of the shim magnetic material, and causes a warning message to be presented if the determined static magnetic field inhomogeneity has exceeded a predetermined allowable value.02-17-2011
20110043206MAGNETIC RESONANCE IMAGING APPARATUS AND RF COIL UNIT - According to one embodiment, a magnetic resonance imaging apparatus includes a correction data acquisition unit configured to perform diffusion weighted imaging to a phantom having a known apparent diffusion coefficient and measure an apparent diffusion coefficient of the phantom to acquire correction data from a measured apparent diffusion coefficient and the known apparent diffusion coefficient, and an image generating unit configured to perform diffusion weighted imaging to an object with a same parameter setting as that of the diffusion weighted imaging to the phantom to generate an apparent diffusion coefficient image from a diffusion weighted imaging data of the object and the correction data.02-24-2011
20110115485Field image tomography for magnetic resonance imaging - Field Image Tomography (FIT) is a fundamental new theory for determining the three-dimensional (3D) spatial density distribution of field emitting sources. The field can be the intensity of any type of field including (i) Radio Frequency (RF) waves in Magnetic Resonance Imaging (MRI), (ii) Gamma radiation in SPECT/PET, and (iii) gravitational field of earth, moon, etc. FIT exploits the property that field intensity decreases with increasing radial distance from the field source and the field intensity distribution measured in an extended 3D volume space can be used to determine the 3D spatial density distribution of the emitting source elements. A method and apparatus are disclosed for MRI of target objects based on FIT. Spinning atomic nuclei of a target object in a magnetic field are excited by beaming a suitable Radio Frequency (RF) pulse. These excited nuclei emit RF radiation while returning to their normal state. The intensity or amplitude distribution of the RF emission field g is measured in a 3D volume space that may extend substantially along the radial direction around the emission source. g is related to the 3D tomography f through a system matrix H that depends on the MRI apparatus, and noise n through the vector equation g=Hf+n. This equation is solved to obtain the tomographic image f of the target object by a method that reduces the effect of noise.05-19-2011
20110115486TRAVELLING-WAVE NUCLEAR MAGNETIC RESONANCE METHOD - A method for acquiring an image or spectrum of a subject or object residing within the magnetic field of a magnetic resonance apparatus, comprises the steps of: 05-19-2011
20100033182MAGNETIC RESONANCE SPECIMEN EVALUATION USING MULTIPLE PULSED FIELD GRADIENT SEQUENCES - Using pulsed-field-gradient (PFG) sequences, the sizes of the pores in ordered porous media can be estimated from the “diffraction” pattern that the signal attenuation curves exhibit. A different diffraction pattern is observed when the experiment is extended to a larger number (N) of diffusion gradient pulse pairs. Differences in the characteristics of attenuation curves also permit distinguishing different pore shapes and distributions using the N-PFG technique. Using an even number of PFG pairs, an approximation to the average pore size can be obtained even when the sample contains pores with a broad distribution of sizes. Multi-PFG sequences can also be used to differentiate free and multi-compartment diffusion, and to estimate compartment sizes and orientations, and to distinguish microscopic and ensemble anisotropy.02-11-2010
20100033180METHOD FOR CALIBRATION OF A MAGNETIC RESONANCE ACQUISITION CHANNEL, CALIBRATION DATA DETERMINATION DEVICE AND MAGNETIC RESONANCE SYSTEM - In a method for calibration of a magnetic resonance acquisition channel having a magnetic resonance acquisition antenna in a magnetic resonance system, in a test signal is emitted by the transmission antenna in the magnetic resonance system and is received by the acquisition antenna. Acquisition channel calibration data for the appertaining magnetic resonance acquisition channel are determined on the basis of the received test signal. The method can be implemented by a calibration data determination device for a magnetic resonance system as well as by a magnetic resonance system itself.02-11-2010
20100164494TRANSMIT PROFILE CONTROL IN MRI - An apparatus for imaging includes: a main magnet to generate a substantially uniform main B07-01-2010
20100164493METHOD AND DEVICE FOR SUPPRESSING MOTION ARTIFACTS IN MAGNETIC RESONANCE IMAGING - In a method and device for suppressing residual motion artifacts, k-space is divided into a snapshot segment, an alternate sampling segment and a high frequency segment in a phase encoding direction; then phase encoding lines are respectively sampled within each of the segments; and a magnetic resonance image is reconstructed according to the phase encoding lines within k-space.07-01-2010
20090322329MAGNETIC RESONANCE APPARATUS AND METHOD FOR DETERMINING A PULSE SEQUENCE TO FEED AN RF RADIATING COIL - In a magnetic resonance apparatus having an RF radiating coil and gradient coils, and in a method for operating such a magnetic resonance apparatus, a pulse sequence, composed of multiple time steps, is specified for operating the gradient coils to time-dependently select regions of a selected slice of a selected volume of a subject. A non-linear equation system is then solved to obtain feed parameters for individual channels of the transmit coil for each time step, with specification of a desired target magnetization, and dependent on the pulse sequence specified for the gradient coils. The non-linear equation system is based on discrete values for time and space variable and, in addition to equations resulting from the Bloch equation, which are non-linear in their feed parameters, includes at least one additional equation that describes boundary conditions for the examination of the subject.12-31-2009
20100219828MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus comprises object placing means for placing an object in an imaging space, translating means for translating the object in a given direction by translating the object placing means in the given direction continuously or step-wise, magnetic field generating means for exciting the desired region of the object by generating a static magnetic field, a gradient magnetic field in the imaging space, and a high-frequency magnetic field in the imaging space, signal detecting means for detecting a magnetic resonance signal from the object, and control unit for controlling the translating means, magnetic field generating means and the signal detecting means, and translating the object continuously or stepwise to a predetermined position at a predetermined speed so as to capture a magnetic resonance image of the object.09-02-2010
20110241669SYSTEM AND METHOD OF PARALLEL IMAGING FOR MAGNETIC RESONANCE IMAGING NEAR METALLIC IMPLANTS - A system and method for magnetic resonance imaging is disclosed, the MRI apparatus comprising a computer programmed to acquire a plurality of 3D MR data sets, each 3D MR data set acquired using a central transmit frequency and a central receive frequency set to an offset frequency value that is distinct for each 3D MR data set, wherein at least a portion of each 3D MR data set is accelerated k-space data, and wherein at least one of the plurality of 3D MR data sets comprises fully-sampled calibration k-space data lines. The computer is also programmed to determine reconstruction weights from the fully-sampled calibration k-space data lines, reconstruct an image for each 3D MR data set using the reconstruction weights from the fully-sampled calibration k-space data lines to synthesize unacquired data, and generate a composite image from the reconstructed images based on the plurality of 3D MR data sets.10-06-2011
20110241680METHOD AND DEVICE FOR A MAGNETIC RESONANCE SYSTEM CONTROL SEQUENCE - A method and a control sequence determination device for determining a magnetic resonance system control sequence is provided. A multichannel pulse train with a plurality of individual RF pulse trains is sent out by a magnetic resonance system over different independent radio-frequency channels in parallel. Based on a prespecified k-space gradient trajectory and a prespecified target magnetization, a multichannel pulse train is calculated in an RF pulse optimization method, where in an RF exposure optimization method, the k-space gradient trajectory is optimized using a function parameterizable at least with respect to an RF exposure value of an object under examination.10-06-2011
20110241679MAGNETIC RESONANCE METHOD AND APPARATUS TO REDUCE DISTORTIONS IN DIFFUSION IMAGES - In a method and apparatus to reduce distortions in diffusion imaging, at least one first measurement is implemented with a first diffusion weighting for a number of slices that are spatially separated from one another and at least one second measurement is implemented with a second diffusion weighting for the number of slices that are spatially separated from one another. A deskewing function is determined as are correction parameters to deskew diffusion-weighted magnetic resonance images on the basis of the measurements, so that image information and/or correction parameters of different slices are linked with one another. The diffusion-weighted magnetic resonance images are distortion-corrected on the basis of the deskewing function and the correction parameters.10-06-2011
20110241678Method for homogenizing resolution in magnet resonance tomography measurements using non-linear encoding fields - A method for magnetic resonance (=MR) imaging, wherein non-linear gradient fields are applied for the purpose of spatial encoding to acquire images of an object to be imaged and wherein the magnet resonance signal radiated from the object to be imaged is sampled on grids in time, to thereby obtain sampling points, is characterized in that the object to be imaged is mapped completely in regions of stronger gradient fields by increasing the density of the sampling points in the center of k-space, and additional sampling points are specifically acquired in the outer regions of k-space according to a k-space sampling pattern depending on the desired distribution of the resolution in the measurement, wherein the MR measurement is calculated with the additional sampling points. An MR imaging method is thereby provided by means of which homogenized resolution is achieved in the MR measurements using non-linear gradient fields for spatial encoding.10-06-2011
20110241676ACCELERATED PSEUDO-RANDOM DATA MAGNETIC RESONANCE IMAGING SYSTEM AND METHOD - The present disclosure is intended to describe embodiments for improving image data acquisition and processing in accelerated dynamic magnetic resonance imaging sequences. One embodiment is described where a method includes an acquisition sequence configured to acquire an undersampled set of magnetic resonance data. The undersampled set of magnetic resonance data has a pseudo-random sampling pattern within a data space acquired at a first time, the pseudo-random sampling pattern being influenced by other pseudo-random sampling patterns within the data space arising from the acquisition of additional undersampled sets of magnetic resonance data at respective times. In some embodiments, the pseudo-random sampling patterns of the undersampled sets of magnetic resonance data interleave to yield a desired sampling pattern.10-06-2011
20110241674Sample Tube and Measurement Method for Solid-State NMR - A solid-state NMR sample tube and method of using same which can be spun stably and at high speed while suppressing its bending resonance. A solid sample to be investigated by solid-state NMR spectroscopy can be sealed in the sample tube. The sample tube includes a hollow cylinder having opposite ends. At least one of the ends is open. The sample tube has a length L, an outside diameter D, and an inside diameter d which satisfy a given relationship disclosed herein.10-06-2011
20110241673METHOD FOR MAGNETIC RESONANCE IMAGING WITH PARALLEL AND LOCALIZED SPATIAL ENCODING MAGNETIC FIELDS - A method for producing an image of a subject with a magnetic resonance imaging (MRI) system is provided. In particular, spatial encoding of signals received from the subject is performed by spatial encoding magnetic fields (SEMs) produced by driving a parallel array of local gradient coils with current weightings that define a mode of the coil array. A set of globally orthogonal modes are determined using a singular value decomposition and two modes that produce SEMs with desired magnetic field variance characteristics are selected for spatial encoding. The spatially encoding signals are received by a parallel array of radio frequency receiver coil elements in order to resolve ambiguities in spatial encoding caused by the SEMs. Images are subsequently reconstructed using, for example, an iterative time domain reconstruction method.10-06-2011
20110241672APPARATUS AND METHOD FOR PARALLEL TRANSMISSION OF RF PULSES IN A SPIN ECHO SEQUENCE - A method, system, and apparatus including a magnetic resonance imaging (MRI) apparatus that includes an MRI system having a plurality of gradient coils, a radio-frequency (RF) transceiver system, an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly, and a computer. The computer is programmed to implement a spin echo sequence to acquire magnetic resonance (MR) data, where the spin echo sequence includes an excitation RF pulse and at least one refocusing pulse per repetition time (TR) of the excitation pulse. The computer is also programmed to transmit at least two component RF pulses in parallel channels during implementation of the spin echo sequence to produce a first refocusing RF pulse and programmed to reconstruct an image from spin echo sequence image data.10-06-2011
20110241670ACCELERATED DYNAMIC MAGNETIC RESONANCE IMAGING SYSTEM AND METHOD - In one embodiment, a method for processing magnetic resonance imaging data is provided. The method includes accessing the magnetic resonance imaging data, the data including a plurality of image data sets defining reconstructable images representative of a subject at different points in time. Each data set includes sampled data for sampled phase encoding points but is missing data for unsampled phase encoding points. An adaptive time window is determined for each image data set, and the missing data of at least one of the image data sets is determined based upon the sampled data for the respective data set and sampled data from at least one other data set within the time window for the respective data set.10-06-2011
20110241677ACCELERATED PSEUDO-RANDOM DATA MAGENTIC RESONANCE IMAGING SYSTEM AND METHOD - The present disclosure is intended to describe embodiments for improving image data acquisition and processing in accelerated dynamic magnetic resonance imaging sequences. One embodiment is described where a method includes an acquisition sequence configured to acquire an undersampled set of magnetic resonance data. The undersampled set of magnetic resonance data has a pseudo-random sampling pattern within a data space acquired at a first time, the pseudo-random sampling pattern being influenced by other pseudo-random sampling patterns within the data space arising from the acquisition of additional undersampled sets of magnetic resonance data at respective times. In some embodiments, the pseudo-random sampling patterns of the undersampled sets of magnetic resonance data interleave to yield a desired sampling pattern.10-06-2011
20110241671SYSTEM AND METHOD FOR SPLIT-ECHO SPLIT-BLADE DATA COLLECTION FOR PROPELLER MAGNETIC RESONANCE IMAGING - A computer readable storage medium has stored thereon a computer program having instructions, which, when executed by a computer, cause the computer to apply a first plurality of RF pulses during a first TR interval of an MR pulse sequence to generate a first echo train. A plurality of echoes of the first echo train are split into a plurality of echo pairs. Within a first echo space, first and second gradient pulses are applied during respective first and second generated echoes, and respective first and second sets of k-space data are acquired that correspond to respective first and second blades of k-space data in the same k-space. The first and second blades have orientations at different angles from one another. The instructions further cause the computer to reconstruct an image based on the acquired first and second sets of k-space data.10-06-2011
20110080168CORRECTION OF TRUNCATIONS IN MR IMAGING - A method is disclosed for correction of truncations of an image of an object under examination in the reconstruction of image data from raw data which has been recorded with a magnetic resonance system from a field of view of the magnetic resonance system, with an object under examination which is located in the field of view of the magnetic resonance system being imaged in the raw data, and with the image recorded by the raw data of the object under examination being truncated at the edge of the field of view if at least one part of the object under examination is located outside the field of view. In at least one embodiment, the method includes determining a number of one-dimensional projections of the imaged field of view in the Radon space from the recorded raw data in order to obtain a projection profile of the image object under examination over the field of view in each case; checking each projection profile for whether the projection profile exhibits a truncation which is caused by the at least one part of the object under examination being located outside the field of view; if the respective checked projection profile exhibits a truncation, expanding the projection profile for correcting the truncation in that the projection profile is extrapolated in accordance with a predetermined extrapolation model in the area in which it exhibits the truncation; and reconstructing image data based on the expanded projection profiles in which the truncation of the image of the object under examination is corrected.04-07-2011
20110080167METHOD FOR DETERMINING MOTION PARAMETERS OF AN OBJECT IN A MAGNETIC FIELD - A method for determining motion parameters of an object by way of at least one coil within a magnetic field adapted for a magnetic resonance based imaging device. Induced pulses are emitted on the coil in order to provide navigator signals that are finally measured in order to provide a spatial position of the object relative to the coil. At least one reference displacement of the object relative to the coil that is spatially and metrically predefined between two positions of the object is generated so that intensity changes of navigator signals at the coil are measured and recorded in a calibration map. Then, for determining each one of a sequence of further positions of an object in motion relatively to the coil, a navigator signal of the coil is measured and is compared to values of intensity changes from the calibration map in order to provide a corrected value of displacement of the object that is recovered from the calibration map and processed so that absolute values of motion parameters of the object are determined.04-07-2011
20090128148NMR tomography method based on NBSEM with 2D spatial encoding by two mutually rotated multipole gradient fields - A nuclear magnetic resonance (NMR) imaging method05-21-2009
20090322331Detecting Spin Perturbations Using Magnetic Resonance Imaging - Implementations and examples of systems, apparatus and techniques for using magnetic resonance imaging to measure spin perturbations. In one implementation, a sample containing nuclear spins is magnetized using a principle magnetic field generated external to the sample. A periodic pulse sequence is applied to the sample. The pulse sequence includes multiple radio frequency (rf) pulses and multiple recovery times between the rf pulses. The pulse sequence is configured to generate, in the presence of a magnetic field perturbation, a sequence of multiple different steady states of magnetization in the sample during each period of the pulse sequence. A magnetic resonance signal acquired from the sample is processed to identify characteristics of a magnetic field perturbation in the sample. In some implementations, processing the signal to identify characteristics of a magnetic field perturbation in the sample includes processing the signal to identify characteristics of an electric current in the sample.12-31-2009
20090219022Methods of In-Vitro Analysis Using Time-Domain NMR Spectroscopy - An in vitro method of determining an analyte concentration of a sample includes placing the sample into a low-field, bench-top time-domain nuclear magnetic resonance (TD-NMR) spectrometer. The NMR spectrometer is tuned to measure a selected type of atom. A magnetic field is applied to the sample using a fixed, permanent magnet. At least one 90 degree radio-frequency pulse is applied to the sample. The radio-frequency pulse is generally perpendicular to the magnetic field. The 90 degree radio-frequency pulse is removed from the sample so as to produce a decaying NMR signal. The decaying NMR signal is measured at a plurality of times while applying a plurality of 180 degree refocusing radio-frequency pulses to the sample. The analyte concentration is calculated from the plurality of measurements associated with the decaying NMR signal and a selected model.09-03-2009
20090219021METHOD AND APPARATUS FOR REMOVING ARTIFACTS DURING MAGNETIC RESONANCE IMAGING - In a method and apparatus for removing artifacts during magnetic resonance imaging, a number of sets of 3D are generated data by scanning, with each set of 3D data containing a number of sets of 2D data. A weighted sum of all the 2D data corresponding to the same overlapped slab is formed. Maximum intensity projection of all the 2D data is implemented, followed by the superposition of the weighted sum data and the maximum intensity projection data to generate the 2D data corresponding to the overlapped slab/The maximum intensity projection of the 3D data formed by 2D data of non-overlapped slabs and 2D data of the corresponding overlapped slabs is implemented so as to generate a final image.09-03-2009
20090219020MAGNETIC RESONANCE IMAGING APPARATUS - When a magnetic resonance signal is received more than once, while a table (transfer unit) is moved, a gradient magnetic field is applied in the table moving direction, and an application amount (intensity and application time) of the gradient magnetic field in the table moving direction is changed every acquisition of data. As for the encoding by the gradient magnetic field in the table moving direction, a series of phase encode is performed at different positions of an examination target, unlike a conventional phase encode. Therefore, the Fourier transform cannot be applied to the image reconstruction. Given this situation, a magnetization map of total FOV of the examination target is determined in such a manner that a sum of the square of an absolute value of a difference is minimized, the difference between a received signal and a signal calculated from the magnetization map set as a variable, and then, the reconstruction is performed. Even when a size of signal acquisition area in the table moving direction is narrow, the magnetic resonance imaging apparatus of the present invention is capable of taking an image of a wide field of view at high speed, by performing the imaging while the table is moved continuously.09-03-2009
20110210736MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging apparatus for imaging a plurality of different slice planes having pre-pulse applying means configured to apply a pre-pulse for affecting in-plane magnetization of all slices of a measurement target, measuring means configured to make a measurement for applying one phase encode amount for one slice plane to obtain an echo signal and dispose the echo signal in a k space, and control means configured to control operations of the pre-pulse applying means and the measuring means. The control means has first control means configured to control to repeat an operation of executing the measurement once according to a predetermined order for all slice planes of the measurement target after a first pre-pulse is applied while a phase encode amount is varied in a predetermined order until all k spaces of all slices are filled, and second control means configured to control the pre-pulse applying means so that the pre-pulse is applied every time the measurement is executed at a frequency which is different from the number of the slices of the measurement target and a multiple number of the number of the slices, and the first control means sets an initial phase encode amount of each slice so as to measure a low spatial frequency area of the k space at a timing having a large effect of the pre-pulse.09-01-2011
20110210734SYSTEM AND METHOD FOR MR IMAGE SCAN AND ANALYSIS - A system and method for MR image scan and analysis include an MRI apparatus that includes a magnetic resonance imaging (MRI) system and a computer programmed to automatically prescribe a first scanning protocol based on the selected examination, acquire a first set of MR data of an imaging object via application of the first scanning protocol, and reconstruct a first image from the first set of MR data. The computer is also programmed to automatically prescribe a second scanning protocol based on the first image, acquire a second set of MR data of the imaging object via application of the second scanning protocol, reconstruct a second image from the second set of MR data, and quantify a first parameter of the imaging object based on the second image.09-01-2011
20100176810System for Use in MR Imaging Using Tissue Mechanical Resonance - A system for use in MR imaging using tissue mechanical resonance includes an external wave generator for generating mechanical waves for transmission through patient anatomy. An RF pulse generator generates an RF pulse for exciting nuclei magnetic moments at specific spin frequencies in a particular selected anatomical region of interest. A motion encoding gradient generator generates a motion encoding gradient magnetic field within a time duration of a read-out gradient and synchronized with generation of the mechanical waves. A data processor processes data derived from radio frequency signals resulting from nuclei spin frequencies responsive to the motion encoding gradient magnetic field to detect the mechanical waves propagating through the patient anatomy.07-15-2010
20090251143Magnetic resonance imaging apparatus and magnetic resonance imaging method - A magnetic resonance imaging apparatus includes a data acquisition unit and an image data generating unit. The data acquisition unit acquires data according to a sequence derived by adding a coherent control pulse on a Steady-State Free Precession pulse sequence for repeating plural radio frequency excitations with a constant interval. The coherent control pulse has a center at a substantially center time between adjacent radio frequency excitations and a zero-order moment of which amount is zero. The image data generating unit generates image data based on the data.10-08-2009
20090033328METHOD AND DEVICE FOR OPTIMIZATION OF IMAGING PARAMETERS - In a method and computerized device for determination of imaging parameters for the acquisition of a magnetic resonance image of an examination subject, initial imaging parameters are established, a calculation is made, based on the initial imaging parameters, of signal intensities for tissue types that occur at least in a portion of the examination subject, and the imaging parameters for the acquisition of the magnetic resonance image under are adapted dependent on the calculated signal intensities.02-05-2009
20090033327Magnetic Resonance Imaging of a Continuously Moving Object - A continuous moving table magnetic resonance imaging method is proposed where a ‘lateral’ read out is performed that is transverse to the direction of motion. This magnetic resonance imaging method for imaging a moving object includes spatially selective RF excitations are applied for respective phase-encodings. The sub-volume is excited by the spatially selective RF excitation moves with the motion of the object for respective subsets of primary phase-encodings. Acquisition of magnetic resonance signals is performed from a three-dimensional sub-volume of the object. The magnetic resonance signals are read encoded in a direction transverse to the direction of motion of the object and phase-encoded in at least the direction of motion of the object.02-05-2009
20100066363IMAGING METHOD FOR OBTAINING SPATIAL DISTRIBUTION OF NANOPARTICLES IN THE BODY - A well-posed magnetic imaging method is disclosed that exploits the non-linear behavior of the characteristic time scale of the Neel relaxation for obtaining accurate high-spatial resolution images of magnetic tracers. The method includes placing an object in a selection field (static field) generated by three pairs of orthogonally arranged coil (drive coils), supplying prudently choice currents to the drive coils, a zero field voxel (ZFV) is formed that can be positioned anywhere in the local region of interest (ROI), switching the magnetizing field off, and collecting an image.03-18-2010
20100066362Method for Obtaining Amplitude and Phase Profiles of RF Pulses for Spatially Selective Excitation - A method for determining amplitude and phase dependencies of radio frequency pulses that are irradiated during traversal of a defined k-space trajectory to produce a spatial pattern of the transverse magnetization in an MR experiment using at least one RF transmission antenna, is characterized in that, in a calibration step, a set of basic pulses is defined, each basic pulse is irradiated individually, the specified k-space trajectory is traversed and at least one set of basic patterns is produced by detection of the MR signals thus excited, which in a range to be examined of the object, are proportional to the complex transverse magnetization produced, wherein the k-space trajectory is traversed fully identically every time at least from the beginning of the irradiation of each basic pulse, and, in a calculation step, a defined target pattern is approximated with a linear combination of the basic patterns of a set or with a mathematical association of linear combinations, with which, within each set, the basic patterns are identically combined, and the amplitude and phase dependencies to be determined are obtained as the corresponding linear combination of the basic pulses. Experimental imperfections can be intrinsically compensated for in this way.03-18-2010
20100066364MAGNETIC RESONANCE DATA ACQUISITION AND IMAGE RECONSTRUCTION METHOD AND SYSTEM - In a method and system to generate magnetic resonance (MR) images by MR data are acquired by a pure phase-coded imaging in k-space having a predetermined set of possible measurement points, with the MR data being acquired only for a predetermined subset of the measurement points of this set. An image is reconstructed from the acquired measurement points of the subset such that information about un-acquired measurement points of the set is also obtained.03-18-2010
20100066361METHOD FOR FAST MAGNETIC RESONANCE RADIOFREQUENCY COIL TRANSMISSION PROFILE MAPPING - A system and method for producing an image indicative of characteristics of a radiofrequency (“RF”) coil with a magnetic resonance imaging (“MRI”) system is disclosed. The method includes acquiring MR signals while performing a pulse sequence with the MRI system and driving the RF coil at a selected transmission power. This process is repeated a plurality of times to drive the RF coil at a different transmission powers during each repetition. A plurality of images are reconstructed from the acquired MR signals and an image indicative of RF reception characteristics of the RF coil is produced from the reconstructed images. Subsequently, an image indicative of RF transmission characteristics of the RF coil is produced using the image indicative of the RF receiver response. More specifically, only one data acquisition is necessary for each RF coil element to produce the image indicative of the RF transmission characteristics for that coil element.03-18-2010
20120242334MAGNETIC RESONANCE METHOD FOR QUANTIFICATION OF MOLECULAR DIFFUSION USING DOUBLE ECHO STEADY STATE SEQUENCES - Disclosed is a magnetic resonance method for the quantification of molecular diffusion. The method uses a diffusion-weighted (dw) double echo steady state sequence (DESS). In particular, the method allows direct quantification of molecular diffusion from two steady state scans with differing diffusion weighting such as one with diffusion-weighting and preferably one without diffusion weighting. Such a quantification of molecular diffusion allows for rapid and/or quantitative measurements of physiological and/or functional parameters of living tissue. Quantitative measurements are often a prerequisite for pre-clinical and clinical research as well as for clinical trials in drug research performed at different sites. Especially for the early diagnosis of subtle or diffuse pathological changes, quantitative MR promises to have a very significant impact.09-27-2012
20110175610NON-CARTESIAN UNDER-SAMPLED MULTI-ECHO MRI - Example apparatuses and methods control a magnetic resonance imaging (MRI) apparatus to perform a non-Cartesian, under-sampled, multi-echo MRI process. One example process includes controlling the MRI apparatus to excite an object to be imaged using a multi-echo Gradient Recalled Echo (GRE) pulse sequence. The example process also includes controlling the MRI apparatus to acquire a data set from the object to be imaged as a function of performing a non-Cartesian, under-sampling acquisition. The data set includes data acquired at two or more echo times (TE) per repetition (TR) and an element in the data set is sampled two or more times as a function of a non-Cartesian trajectory that crosses itself at least once. The process also includes controlling the MRI apparatus to reconstruct an image of the object to be imaged from the data set. The image may map brain activity.07-21-2011
20110101978MOTION INFORMATION CAPTURE AND AUTOMATIC MOTION CORRECTION FOR IMAGING SYSTEMS - Systems, methods and articles of manufacture are disclosed for compensating for motion of a subject during an MRI scan of the subject. k-space data may be received from the MRI scan of the subject. Motion information may be received for the subject. Based on the received motion information, a translational motion of the subject may be determined between a first point in time and a second point in time. A search space for motion correction may be reduced using the determined change and an error margin of the capturing technique. A motion-compensated, graphical image of the subject may be generated using the reduced search space.05-05-2011
20110074418MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD OF ASSISTING SETTING OF IMAGING PARAMETER - An object is to enhance usability of parameter check when an imaging parameter is changed in multistation imaging, and easily obtain a desired image with high quality. In the multistation imaging, it is determined in a lump before imaging whether an image having desired quality is obtained by using the changed value of the imaging parameter, and the result is presented to an operator. The determination is executed in the order of “possible or impossible” determination of execution of imaging itself and “possible or impossible” determination of combination of obtained images. When it is determined that it is impossible to execute the imaging itself, the determination processing is finished. At this time, a recommended value may be presented.03-31-2011
20110074415APPARATUS FOR TUNING MAGNETIC RESONANCE COIL ELEMENTS AND METHOD OF MAKING SAME - A method, system, and apparatus including a radio-frequency (RF) phased coil array for a magnetic resonance (MR) imaging apparatus that includes a first RF coil element tuned to a first frequency and configured to receive MR signals and a second RF coil element tuned to a second frequency different than the first frequency and configured to receive MR signals.03-31-2011
20110074413SYSTEM AND METHOD FOR CONTROLLING CURRENT IN GRADIENT COIL OF MAGNETIC RESONANCE IMAGING SYSTEM - In one embodiment, a multilevel inverter for generating an AC output voltage, having at least seven potential levels, from a DC voltage source such that the generated AC voltage produces a current in a gradient coil of a magnetic resonance imaging system is provided. The multilevel inverter comprises an input voltage supply device configured for providing a divided DC voltage, at least eight switching arms for deriving the AC output voltages from the divided DC voltages, each of the switching arms comprising an input terminal receiving the divided DC voltage, a switching device controlling the AC output voltage and an output terminal providing the AC output voltage, at least four diodes, each of the four diodes connected to a single pair of switching arms, the four diodes forming a full bridge having positive and negative nodes, one of the nodes connected to the input voltage supply device and another node connected to the input terminals of the switching arms and a controller coupled to the input voltage supply device and the four diodes, the controller configured for producing plurality of control signals for controlling the AC output voltage.03-31-2011
20090091324MRI APPARATUS - A flip-angle calculating unit calculates a flip angle of a fat-suppression pulse by inputting scanning parameters read from a scanning-parameter storage unit based on scanning conditions set by a scan-condition setting unit and a desired fat-suppression level, into a predetermined computing program. A control unit suppresses fat signals to a desired level by performing irradiation of a fat-suppression pulse having the calculated flip angle and application of a spoiler gradient magnetic field onto a scan target portion of a subject by controlling a gradient magnetic-field generating unit and a transmitting-receiving unit, and further performs irradiation of an RF pulse and application of a gradient magnetic field in accordance with a predetermined pulse sequence, thereby detecting water signals and suppressed fat signals as MR signals. An image-data creating unit creates image data by reconstructing the MR signals.04-09-2009
20120146640MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, an MRI apparatus (06-14-2012
20120146642MAGNETIC RESONANCE IMAGING WITH HIGH SPATIAL AND TEMPORAL RESOLUTION - Methods, systems, and apparatus for magnetic resonance imaging (MRI) are described. In one example, the method includes applying a sample-selective magnetic field gradient sequence along a slice direction to partition responses from a sample under magnetic resonance imaging into a plurality of different regions of slices in the k space, applying spiral readout gradients to the sample to obtain echo data from the sample, and applying a Time Resolved Imaging of Contrast Kinetics imaging technique to sample the different regions of slices in the k space.06-14-2012
20110101979AMPLIFIED RADIATION DAMPING FOR MR IMAGING AND SPECTROSCOPY - An imaging system including an imaging apparatus having a plurality of coils, wherein an imaging target is at least partially disposed proximate the coils with at least one excitation source providing pulse sequences. A switch switchably connects the pulse sequences from the excitation source to the coils and switchably connecting to spatially encoded images from the coils during data acquisition. There is an amplified radiation damping feedback section providing amplified radiation damping feedback to the imaging target, wherein the amplified radiation damping feedback provides recovery of longitudinal magnetization subsequent to the data acquisition, and a receiver section for processing the spatially encoded images.05-05-2011
20110101980MAGNETIC RESONANCE IMAGING APPARATUS - According to one embodiment, a magnetic resonance imaging apparatus includes; an imaging area setting unit configured to set an imaging area for a patient according to an imaging condition; an excitation angle determination unit configured to collect magnetic resonance signals from the imaging area by a pre-scan and to determine, on the basis of the collected magnetic resonance signal, an optimal excitation angle of a radio-frequency magnetic field for use in an imaging scan; and an imaging unit configured to acquire imaging data by carrying out the imaging scan of the set imaging area for the patient applying the radio-frequency magnetic field with the determined optimal excitation angle.05-05-2011
20110074414IMPLANTABLE OR INSERTABLE NUCLEAR MAGNETIC RESONANT IMAGING SYSTEM - Nuclear Magnetic Resonant Imaging (also called Magnetic Resonant Imaging or “MRI”) devices which are implantable, internal or insertable are provided. The disclosure describes ways to miniaturize, simplify, calibrate, cool, and increase the utility of MRI systems for structural investigative purposes, and for biological investigation and potential treatment. It teaches use of target objects of fixed size, shape and position for calibration and comparison to obtain accurate images. It further teaches cooling of objects under test by electrically conductive leads or electrically isolated leads; varying the magnetic field of the probe to move chemicals or ferrous metallic objects within the subject. The invention also teaches comparison of objects using review of the frequency components of a received signal rather than by a pictorial representation.03-31-2011
20110074417MAGNETIC RESONANCE IMAGING APPARATUS AND CONTROL METHOD THEREOF - To provide a magnetic resonance imaging apparatus capable of acquiring a non-contrast MRA image in which a background signal is sufficiently suppressed in a shorter time. A magnetic resonance imaging apparatus has: a data acquiring unit that acquires a plurality of pieces of magnetic resonance data associated with a plurality of different delay times according to a pulse sequence in which a region-selective saturation pulse is first applied, a region-non-selective inversion recovery pulse is then applied, and then the magnetic resonance data is acquired, the delay time being defined as a period from a time of application of the saturation pulse to a time of start of acquisition of the magnetic resonance data; and a blood flow image creating unit that creates a plurality of pieces of blood flow image data associated with the plurality of different delay times using the magnetic resonance data.03-31-2011
20110074416MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a magnetic resonance data acquisition unit and a cerebrospinal fluid image data generation unit.03-31-2011
20120119740MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, a magnetic resonance imaging apparatus includes a spectrum acquisition unit, a resonance frequency acquisition unit and an imaging unit. The spectrum acquisition unit is configured to acquire frequency spectra of magnetic resonance signals from an object with changing a suppression effect or an enhancing effect of signals from a specific material. The resonance frequency acquisition unit is configured to obtain a resonance frequency of the specific material or another material based on an index representing a difference in intensities of signals from the specific material or the another material between the frequency spectra. The imaging unit is configured to perform imaging using a radio frequency pulse of which center frequency is set to the resonance frequency of the specific material or the another material.05-17-2012
20120119737PHASE-DEPENDENT MAGNETIC-RESONANCE IMAGING WITH MULTIPLE COILS - In a method and magnetic resonance system to determine a magnetic resonance (MR) image of an examination subject, wherein multiple coil-specific MR data sets that are acquired by multiple coils are used for the MR image. Each pixel of the MR image is determined from at least two coil-specific MR data sets of different coils (05-17-2012
20120119738METHODS AND APPARATUS FOR SAMPLE TEMPERATURE CONTROL IN NMR SPECTROMETERS - Described are methods and apparatus, referred to as “temperature-lock,” which can control and stabilize the sample temperature in an NMR spectrometer, in some instances with a precision and an accuracy of below about 05-17-2012
20110068791ULTRA-FAST PRE-POLARIZING MAGNETIC RESONANCE IMAGING METHOD AND SYSTEM - A method and apparatus generate a pre-polarizing magnetic field having a rise-time of less than about 10 microseconds and/or a fall-time of less than about 10 microseconds for immersing a tissue sample in the pre-polarized magnetic field to polarize an animal tissue sample whereby magnetic gradient and/or radio-frequency pulses may be applied in order to read out the location and/or state of the spins. A method and apparatus deliver such magnetic fields through planar coils. A method and apparatus enable guidance and propulsion of magnetic fluids.03-24-2011
20110248714METHOD AND APPARATUS FOR MAGNETIC RESONANCE GUIDED HIGH INTENSITY FOCUSED ULTRASOUND FOCUSING UNDER SIMULTANEOUS TEMPERATURE MONITORING - In a method and an apparatus for magnetic resonance guided high intensity focused ultrasound (HIFU), precise localization of the focal point of the HIFU is determined by imaging an examination subject in parallel with GRE sequences that respectively include a positive monopolar gradient pulse and a negative monopolar gradient pulse, that respectively encode the acoustic radiation force (ARF)-induced phase shift that is induced by the simultaneous activation of HIFU during the sequences. A GRE phase image is reconstructed from each acquisition sequence, and a difference image is formed between the two GRE phase images, from which the HIFU focal point is determined. An average image is formed of the two GRE phase images from which PRFS temperature map is determined simultaneously to ARFI map. The use of parallel imaging and the use of partial Fourier reconstruction for reconstructing the GRE phase images allows the data to be acquired sufficiently rapidly so as to minimize the adverse effect of tissue heating that occurs with conventional longer-duration, and repetitious, techniques.10-13-2011
20100244823MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging apparatus comprising static magnetic field generating means for generating a static magnetic field in an imaging space, measuring means for generating a high-frequency magnetic field and a gradient magnetic field in the imaging space and measuring a nuclear magnetic resonance signal generated from an object to be examined placed in the imaging space, signal processing means for reconstructing a magnetic resonance image according to the nuclear magnetic resonance signal, control means for controlling the measuring means and the signal processing means, and display means for displaying the reconstructed magnetic resonance image obtained by the signal processing means.09-30-2010
20100264924MAGNETIC RESONANCE METHOD AND APPARATUS WITH DISPLAY OF DATA ACQUISITION PROGRESS FOR A SUBJECT CONTINUOUSLY MOVING THROUGH THE APPARATUS - In a method and magnetic resonance apparatus to display progress of the acquisition of measurement data of an examination region of an examination subject during continuous travel of the examination region through a magnetic resonance apparatus, a current projection image is calculated on the basis of current measurement data acquired from central k-space during the continuous travel of the examination region, and the currently calculated projection image is displayed. By the calculation of the projection images on the basis of measurement data from central k-space, this calculation can ensue particularly quickly and with little effort. A particularly fast display of the projection images is therefore possible. A projection image can be calculated particularly quickly and simply from measurement data along a central k-space line—i.e. a k-space line that runs through the center of k-space—using a one-dimensional Fourier transformation along this central k-space line.10-21-2010
20100052675System for Image Acquisition With Fast Magnetic Resonance Gradient Echo Sequences - A system uses a three-dimensional spoiled gradient recalled echo sequence for fat suppression with reduced total acquisition time suitable for acquiring image data under breath-hold conditions using a reversed asymmetry during data acquisition on an opposed phase echo. A system reduces RF pulse repetition time in an MR imaging pulse sequence in an MR imaging device. The system includes an RF pulse generator for generating an RF excitation pulse sequence having a pulse repetition interval. A read-out gradient magnetic field generator generates an asymmetric read-out gradient magnetic field having a readout gradient mid-point occurring prior to an RF echo pulse peak. The RF echo pulse peak is received in response to a generated RF excitation pulse.03-04-2010
20090295385Magneto Sensor System and Method of Use - Instruments, systems and methods for using the instrument and systems are disclosed, where the systems include a magneto sensor, such as a superconducting quantum interference device (“SQUID”) and are designed to detect changes in a magnetic field in an animal including a human.12-03-2009
20110210732Balanced steady-state free-precession transient imaging using variable flip angles for a predefined signal profile - A magnetic resonance imaging system or method is provided including a balanced steady-state free-precession transient imaging (transient bSSFP) device capable of increasing the overall signal during transient bSSFP acquisition by fully or better utilization of the magnetization through variable RF flip angles. The transient bSSFP device is capable of generating a series of echoes with a desired transverse magnetization profile M09-01-2011
20110210733B1-ROBUST AND T1-ROBUST SPECIES SUPPRESSION IN MRI - An MRI multi-echo data acquisition sequence (REFUSAL=REFocusing Used to Selectively Attenuate Lipids) includes a spectrally-selective re-focusing RF pulse. The REFUSAL pulse can be non-spatially selective or spatially-selective. The REFUSAL pulse selectively refocuses water spins and avoids refocusing lipid spins. The REFUSAL pulse ideally maximizes refocusing for water and minimizes any lipid refocusing, with built-in robustness to B09-01-2011
20080284433Ultra-low field nuclear magnetic resonance and magnetic resonance imaging to discriminate and identify materials - An ultra-low magnetic field NMR system can non-invasively examine containers. Database matching techniques can then identify hazardous materials within the containers. Ultra-low field NMR systems are ideal for this purpose because they do not require large powerful magnets and because they can examine materials enclosed in conductive shells such as lead shells. The NMR examination technique can be combined with ultra-low field NMR imaging, where an NMR image is obtained and analyzed to identify target volumes. Spatial sensitivity encoding can also be used to identify target volumes. After the target volumes are identified the NMR measurement technique can be used to identify their contents.11-20-2008
20110175612MAGNETIC RESONANCE IMAGING WITH INDEPENDENT EXCITATION AND ACQUISITION VOLUMES - A method of magnetic resonance that uses non-aligned slab excitation and encoding. By separating the directions of slab excitation and slab phase encoding, the method may allow voxel orientation that is independent of the excitation direction. Accordingly, volume excitation may be chosen based on anatomical landmarks which are not aligned in the excitation direction.07-21-2011
20110175611Method for NMR spectroscopy or MRI measurements using dissolution dynamic nuclear polarization (DNP) with scavenging of free radicals - A method for sample preparation for magnetic resonance measurements using Hyperpolarization by Dissolution Dynamic Nuclear Polarization, involves preparation of frozen beads of a first kind containing paramagnetic substances in addition to the solute under investigation; insertion of the frozen beads into a polarizing magnet; creation of enhanced polarization of nuclei in a magnetic field; heating of the sample to room temperature; transfer of the sample to an MR magnet; and carrying out an MR measurement. In addition, frozen beads of a second kind containing a reducing agent are prepared and inserted into the polarization magnet together with the frozen beads of the first kind. By this method, longitudinal and transverse relaxation times in NMR are extended and free radicals in hyperpolarized solutions are eliminated.07-21-2011
20080231272Magnetic Resonance Imager - Provided is a magnetic resonance imager capable of efficiently suppressing artifacts in radial scanning that is short of the number of echoes.09-25-2008
20080303520Methods suitable for measuring capillary pressure and relative permeability curves of porous rocks - Single-shot methods suitable for determining capillary pressure and relative permeability curves are proposed. For steady-state gas flow, with stationary water or oil remaining in a porous rock core and the outflow boundary condition (capillary pressure is zero) is maintained by washing the outlet face of the core with the stationary phase, the gas pressure distribution, P(x), is determined by SPRITE (Single-Point Ramped Imaging with T12-11-2008
20080252292MAGNETIC RESONANCE DIAGNOSING APPARATUS AND MEDICAL IMAGE DISPLAY APPARATUS - A magnetic resonance diagnosing apparatus includes an imaging unit which images each slice image of a subject in relation to a plurality of different imaging slices, a measurement unit which measures a magnetic resonance spectrum of the subject in relation to a measurement slice, a selection unit which selects slice images corresponding to one or more imaging slices which at least partially overlap the measurement slice from the plurality of slice images, and a creation unit which creates a display image which simultaneously shows the selected one or more slice images and the spectral image.10-16-2008
20080252291High Angular Resolution Diffusion Weighted Mri - A magnetic resonance imaging method involves acquisition of magnetic resonance signals with application of diffusion weighting at a plurality of diffusion weighting strengths diffusion directions. An object dataset is reconstructed from the magnetic resonance signals in which apparent diffusion coefficients are assigned. The occurrence of one single or several diffusion directions in identified for individual voxels. In this way account is taken of crossing fibres.10-16-2008
20110254550SIMULTANEOUS DIFFUSION IMAGING OF MULTIPLE CROSS SECTIONS - A diffusion imaging method is provided. The diffusion imaging method includes performing a plurality of data collection sequences. Each data collection sequence includes applying an excitation radio frequency signal and a selection gradient. The excitation radio frequency signal includes a first set of frequency bands selected to simultaneously excite a first nuclei type in a plurality of cross sections of a subject. Each data collection sequence further includes applying a diffusion gradient during formation of a magnetic resonance signal, applying a spatial encoding gradient during formation of the magnetic resonance signal, and while acquiring the magnetic resonance signal, applying a separation gradient to change a frequency separation between portions of the magnetic resonance signal. The diffusion imaging method further includes computationally determining a diffusion image of each of the plurality of cross sections.10-20-2011
20110254549Method for k-Space Reconstruction in Magnetic Resonance Inverse Imaging - A method for parallel magnetic resonance imaging (“pMRI”) that does not require the explicit estimation of a coil sensitivity map is provided. Individual coil images are reconstructed from undersampled scan data that is acquired with a radio frequency (RF) coil array having multiple coil channels. An inverse operator is formed from autocalibration scan (ACS) data, and is applied to the acquired scan data in order to produce reconstruction coefficients. Missing k-space lines in the undersampled scan data are synthesized by interpolating k-space lines in the acquired scan data using the reconstruction coefficients. From the acquired scan data and the synthesized missing k-space lines, individual coil images are reconstructed and combined to form an image of the subject.10-20-2011
20100277173METHOD AND MAGNETIC RESONANCE TOMOGRAPHY APPARATUS FOR TRIGGERED ACQUISITION OF MAGNETIC RESONANCE DATA - In a method and magnetic resonance tomography apparatus for triggered implementation of a measurement (composed of partial measurements) in the magnetic resonance tomography apparatus, at least one image data set is determined from the data acquired within the scope of the partial measurements, and for triggering a reference point of the movement phase of the movement is used. The image data set is acquired in segments; the reference point is detected by a control device independent of a partial measurement, and the partial measurement following the detected reference point is conducted depending on the independently detected reference point. The wait time that specifies the interval from the end of the partial measurement to the beginning of the next partial measurement is adapted depending on the point in time of detection.11-04-2010
20100277170HEAT PIPE COOLED SUERCONDUCTING MAGNETS WITH CERAMIC COIL FORMS - A system and method for a magnetic resonance (MR) imaging system includes a coil form, at least one magnet positioned about the coil form and configured to generate a magnetic field, at least one gradient coil for manipulating the magnetic field generated by the at least one magnet by way of a gradient field, and a heat pipe thermally connected to the coil form and having a cryogen therein. The MR imaging system also includes a cryocooler connected to the heat pipe to cool the heat pipe and the cryogen, wherein the coil form is comprised of a thermally conductive material in which eddy currents are substantially reduced during operation of the at least one gradient coil. The present invention has been described in terms of the preferred embodiment, and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.11-04-2010
20100277172MAGNETIC RESONANCE IMAGING APPARATUS AND SUSCEPTIBILITY-EMPHASIZED IMAGING METHOD - When performing susceptibility-emphasized imaging using the echo planar method in an MRI apparatus, it is possible to obtain a susceptibility-emphasized image having a preferable signal-to-noise ratio.11-04-2010
20080204016Magnetic Resonance Apparatus and Method - Magnetic resonance apparatus is provided comprising a magnet having a first pair of coils arranged in a plane. The coils are operable in a counter-running manner when in use so as to generate a sensitive volume of magnetic field spaced apart from said plane. The magnetic field in the sensitive volume is arranged to have sufficient uniformity to enable magnetic resonance signals to be obtained from a target when located within the sensitive volume. The magnetic field direction Z is oriented to lie substantially parallel to the planes. The coils are arranged such that the sensitive volume is elongate in a direction X substantially parallel to the planes. A drive system is provided to cause relative movement between the magnet and the target so as to allow the sensitive volume to be moved with respect to the target.08-28-2008
20080204018METHOD AND MAGNETIC RESONANCE APPARATUS FOR SETTING A SHIM TO HOMOGENIZE A MAGNETIC FIELD IN THE APPARATUS - In a method for determination or adaptation of a shim for homogenization of a magnetic field of a magnetic resonance apparatus, which magnetic field is provided for the generation of magnetic resonance exposures of a specific examination region, an automatic determination, of a computer and/or supported by an operator on an image output unit of the computer, is made of a three-dimensional volume that is relevant for the determination or adaptation of the shim and that is matched to the examination region and/or an examination protocol by selection from an arbitrary morphology set of selectable volumes (which morphology set is not limited to specific shapes) and/or by generation of an arbitrarily three-dimensional volume not limited to specific shapes. The computer then automatically calculates the shim for the determined or selected three-dimensional volume.08-28-2008
20080204019HIGH FIELD MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR OBTAINING HIGH SIGNAL-TO-NOISE BY ITS RECEIVING COIL - In a high field magnetic resonance imaging apparatus and a method for obtaining signals having a high signal-to-noise ratio with the receiving coil thereof, the apparatus has at least a basic magnet and a receiving coil, the basic magnet generating a basic magnetic field, and the receiving coil being disposed within the basic magnetic field and forming an accommodating cavity. The accommodating cavity of the receiving coil is perpendicular to the direction of the basic magnetic field and is positioned in the field of view of the apparatus. The receiving coil is a loop type coil. The apparatus can further have a bracket for fixing the receiving coil. In the method, a receiving coil is used to receive signals in a magnetic field, wherein the receiving coil is perpendicular to the direction of the magnetic field. By using the apparatus and the corresponding method since the receiving coil can have a loop type design, the signal-to-noise ratio is increased. Moreover, the receiving coil can be disposed at a position closer to the center of the field of view, so that the imaging quality is improved.08-28-2008
20100283463METHOD AND APPARATUS FOR FIELD MAP ESTIMATION - A method for estimating values of a field map to generate a magnetic resonance display image with species separation is provided. A set of MR images is acquired based on an applied magnetic resonance excitation. A set of feasible field map values for each pixel in a field map are determined from the set of MR images. Estimated values of the field map for each pixel are chosen from the set of feasible field map values using a combinatorial optimization algorithm that includes a smoothness constraint. The combinatorial optimization algorithm includes iteratively communicating, between neighboring pixels in the field map, sum-product belief messages that include likelihoods for feasible field map values. Field map values are fixed to most likely field map values if the pixel satisfies the smoothness constraint with its neighboring pixels. A magnetic resonance display image with species separation is generated using the estimated field map.11-11-2010
20110254547METHOD FOR SEPARATING MAGNETIC RESONANCE IMAGING SIGNALS USING SPECTRAL DISTINCTION OF SPECIES - A method for producing an image of a subject with a magnetic resonance imaging (MRI) system in which a signal contribution of a chemical species is depicted and a signal contribution of another chemical species is substantially separated is provided. For example, the provided method is applicable for water-fat separation. Spectral differences between at least two different chemical species are exploited to produce a weighting map that depicts the likelihood that one chemical species being depicted as another. A weighting map that characterizes the smoothness of a field map variation is also produced. These weighting maps are utilized to produce a correct field map estimate, such that a robust separation of the signal contributions of the at least two chemical species can be performed.10-20-2011
20090315558SELF-REFOCUSED SPATIAL-SPECTRAL PULSE - A method for frequency selective and slice selective magnetic resonance imaging (MRI) is provided. A B12-24-2009
20110133736Coherent Signal Acquisition System for MR Imaging and Spectroscopy - A system processes an MR dataset to provide an MR signal generated by a group of protons having substantially the same proton spin precession angle. The system includes a computation processor for determining phase angles of RF pulses for use in acquiring MR signal data of a desired coherence pathway in response to, predetermined data indicating a number of coherence pathways in multiple MR datasets to be acquired, predetermined information indicating different types of MR signals present in the multiple MR datasets to be acquired and at least one phase equation selected in response to a corresponding at least one type of the types of MR signals present in the MR datasets to be acquired. The number of coherence pathways represents a corresponding number of groups of protons having substantially the same proton spin precession angle. An RF signal generator generates RF pulses for acquiring multiple MR datasets including MR signal data of the desired coherence pathway using the determined phase angles. An MR imaging device performs multiple MR scans to provide the multiple MR datasets using the generated RF pulses.06-09-2011
20110260725Time Resolved Spin Labeled MRI Cineangiography - A sequence of magnetic resonance images of the beating heart depicts the flow of blood through the heart chambers. Blood appears bright and background tissues are darkened by acquiring MR data following a preparatory pulse sequence in which spin magnetization throughout the field of view is inverted using a non-selective RF inversion pulse and spin magnetization in a selected pool of blood moving into the heart is re-inverted by a selective RF inversion pulse.10-27-2011
20100117644METHOD AND APPARATUS FOR ACQUIRING MAGNETIC RESONANCE IMAGING DATA FOR DYNAMIC STUDIES - A method for acquiring magnetic resonance (MR) data for a three-dimensional (3D) dynamic study includes partitioning a k05-13-2010
20120146638SYSTEM AND METHOD FOR REDUCING LOCALIZED SIGNAL FLUCTUATION - A system and method is disclosed for eliminating localized fluctuation artifacts caused by fat signal contamination in MR images, the system includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images, and a computer programmed to apply a spectral-spatial fat saturation pulse, apply a slice selection gradient pulse, acquire imaging data of an imaging slice of interest, and generate an image.06-14-2012
20110080169Method for position dependent change in the magnetization in an object in a magnetic resonance experiment - A method for position dependent change in the magnetization in an object, according to a requirement in a magnetic resonance measurement, wherein radio-frequency pulses are irradiated in conjunction with supplementary magnetic fields that vary in space and over time and are superposed on the static and homogeneous basic field of a magnetic resonance measurement apparatus along a z-direction, is characterized in that non-linear supplementary magnetic fields are used, whose spatial gradient of the z-component is not constant at least at one instant of the irradiation, and that the radio-frequency pulses to be irradiated are calculated in advance, wherein progressions over time of the field strengths of the supplementary magnetic fields in the region of the object that are calculated and/or measured position-dependently are included in this calculation. This enables change in the magnetization with an at least locally spatially higher resolution and/or shorter irradiation duration of the RF pulses and supplementary magnetic fields than is feasible with linear supplementary magnetic fields produced by conventional gradient systems. In particular, this is possible under the technical and physiological conditions that currently constrain the performance of the known methods using linear supplementary fields.04-07-2011
20110095761DETECTION OF MAGNETIC FIELDS USING NANO-MAGNETS - Magnetic field detection techniques and devices are provided. In one embodiment, a device configured to detect a magnetic field includes a first set of nano-magnets and a second set of nano-magnets. The first set of nano-magnets is operable to induce a RF magnetic field, and the second set of nano-magnets is operable to induce a first electrical signal in response to magnetic resonance signals caused by the RF magnetic field.04-28-2011
20110095760MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus has a storage unit and a processing unit. The storage unit stores correction data of a position coordinate, in which the position coordinate in the reconstruction FOV is caused to correspond to a position coordinate in a display FOV included in the reconstruction FOV based on an intensity of a gradient magnetic field. If both of a first position coordinate and a second position coordinate, which is further from the center of the reconstruction FOV, correspond to same position coordinate in the display FOV, the correction data is data for causing only the first position coordinate to correspond to the position coordinate in the display FOV. The processing unit corrects a reconstructed image based on the correction data and obtains an image of the display FOV.04-28-2011
20110175614METHODS OF IN-VITRO ANALYSIS USING TIME-DOMAIN NMR SPECTROSCOPY - An in vitro method of determining an analyte concentration of a sample includes placing the sample into a low-field, bench-top time-domain nuclear magnetic resonance (TD-NMR) spectrometer. The NMR spectrometer is tuned to measure a selected type of atom. A magnetic field is applied to the sample using a fixed, permanent magnet. At least one 90 degree radio-frequency pulse is applied to the sample. The radio-frequency pulse is generally perpendicular to the magnetic field. The 90 degree radio-frequency pulse is removed from the sample so as to produce a decaying NMR signal. The decaying NMR signal is measured at a plurality of times while applying a plurality of 180 degree refocusing radio-frequency pulses to the sample. The analyte concentration is calculated from the plurality of measurements associated with the decaying NMR signal and a selected model.07-21-2011
20100213939REMOTE BODY ARRAYS FOR HIGH-PERFORMANCE MAGNETIC RESONANCE IMAGING AND SPECTROSCOPY - In a magnetic resonance imaging apparatus and method, radio frequency signals are radiated into an examination subject and/or received from the examination subject by an array of radio frequency coils that completely encircles the examination subject, and that is located at a distance from the examination subject out of contact with the examination subject.08-26-2010
20100213937Magnetic Resonance Imaging Apparatus and Method - An magnetic resonance imaging apparatus includes: imaging means for dividing an object to be examined into a plurality of regions in a predetermined direction, setting images of slice positions for each of the regions so that the slice positions are continuous in each region, and imaging each of the regions while moving the object stepwise; and display means for acquiring a plurality of image data having three types of categories: the region, the slice position and the imaging sequence, and displaying the image data.08-26-2010
20100079142COMBINED MAGNETIC RESONANCE IMAGING AND TARGETING DEVICE FOR MAGNETIC PARTICLES - The invention relates to a combined magnetic resonance imaging and targeting device for magnetic particles having a magnetic coil array. The magnetic coil array comprises a plurality of coils, each of which is connected to a power supply. The power supplies are connected to a controller which is embodied for two operating modes. In a first operating mode the power supplies are controlled in such a way that a magnetic field extreme value is generated at at least one location in a target region. In a second operating mode the power supplies are controlled in such a way that magnetic fields having a strictly monotonously rising or falling magnetic field profile are generated in an imaging region.04-01-2010
20100079141MAGNETIC RESONANCE SYSTEM AND METHOD FOR CORRECTION OF DISTORTION DUE TO CONTINUOUS MOVEMENT OF PATIENT TABLE - In a method and magnetic resonance (MR) for reduction and correction of image distortions that occur in the generation of MR images of an examination subject that is arranged on a table that is continuously driven through the MR system during the generation of the MR images and whose cause is the acquisition of MR data of an image at varying positions within the MR system, raw MR data are acquired in multiple segments with radial filling of k-space with the raw data, an intersection region in the k-space center is determined that is covered by multiple segments given the radial filling of the raw data in k-space, and the distortions are automatically calculated based on the intersection region of at least two different segments.04-01-2010
20100060280MR IMAGING WITH AN RF PULSE PRODUCING REDUCED MAGNETIZATION TRANSFER - A system and method are provided herein for designing and transmitting RF pulses which cause a reduced off-resonance magnetization transfer saturation. An RF pulse shape may be optimized according to a set of Bloch solutions defining a desired magnetization profile. An RF pulse may be transmitted according to this optimized shape according to a k-space trajectory which traverses a high amplitude portion of the RF pulse more times than one or more low amplitude portions. In addition, a generally alternating slice select gradient may be applied during transmission of the RF pulse.03-11-2010
20100060278MAGNETIC RESONANCE IMAGING METHOD AND APPARATUS WITH PHASE-SENSITIVE FLUID SUPPRESSION - In a method and magnetic resonance (MR) apparatus to separate a signal component of a cerebrospinal fluid from other signal components in the acquisition of MR images of an examination subject, a first signal acquisition with spin echo-based signals is executed, in which the signal components of the cerebrospinal fluid and the other signal components have the same phase position, and a second signal acquisition with spin echo-based signals is then executed, in which the signal components of the cerebrospinal fluid and the other signal components have an opposite phase position. An MR image with signals of the other signal components is determined based on the two signal acquisitions with the signal component of the cerebrospinal fluid is significantly suppressed.03-11-2010
20100060279MR IMAGING WITH AN RF PULSE PRODUCING REDUCED MAGNETIZATION TRANSFER - A system and method are provided herein for designing and transmitting RF pulses which cause a reduced off-resonance magnetization transfer saturation. An RF pulse shape may be optimized according to a set of Bloch solutions defining a desired magnetization profile. An RF pulse may be transmitted according to this optimized shape according to a k-space trajectory which traverses a high amplitude portion of the RF pulse more times than one or more low amplitude portions. In addition, a generally alternating slice select gradient may be applied during transmission of the RF pulse.03-11-2010
20100060277METHODS AND APPARATUS FOR NON-CONTRAST ENHANCED PULMONARY MAGNETIC RESONANCE IMAGING - In one aspect, a method of inducing nuclear magnetic resonance (NMR) signals from a region of an object having at least a portion of at least one pulmonary vein using at least one coil adapted to emit electromagnetic signals to induce an NMR effect is provided. The method comprises operating the at least one coil to provide at least one imaging sequence at an effective off-resonance frequency adapted to cause NMR signals to be emitted from the at least one pulmonary vein, and detecting at least some of the NMR signals to obtain NMR data corresponding to the at least one pulmonary vein.03-11-2010
20100060276SYSTEM AND METHOD FOR TISSUE POINT TRACKING USING MAGNETIC RESONANCE IMAGING - A system and method for MR based tracking of a tissue point includes a RF coil assembly configured to emit RF pulse sequences and a system control coupled to the RF coil assembly. The system control is programmed to cause the RF coil assembly to emit a first RF pulse comprising a first pair of two-dimensional (2D) spatially selective beams, each of the beams being directed to a respective tagging location in the subject of interest and wherein the tagging locations are equidistant from a pre-determined point-of-interest. The system control is further programmed to acquire a first series of MR images from a subject of interest, identify the first pair of 2D spatially selective beams in each MR image in the first series of MR images, and track a position of the point-of-interest based on the identified 2D spatially selective beams in the first series of MR images.03-11-2010
20080218168MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a applying unit which applies a gradient magnetic field and a radio-frequency pulse to a subject placed in a static magnetic field, a radio-frequency coil unit which includes element coils to respectively detect magnetic resonance signals emitted from the subject, and outputs signals of a plurality of channels based on the magnetic resonance signals, receiving circuits each of which receives one of the signals of the plurality of channels, and whose number is smaller than the channels, a selecting circuit which includes matrix switches connected in multiple stages, selects some of magnetic resonance signals from the signals of the channels, and inputs the selected magnetic resonance signals to the receiving circuits, a setting unit which sets diagnostic conditions, and a determining unit which determines a connection state of the matrix switches in accordance with the set diagnostic conditions.09-11-2008
20100194390MAGNETIC RESONANCE METHOD AND APPARATUS FOR TIME-RESOLVED ACQUISITION OF MAGNETIC RESONANCE DATA - In a magnetic resonance method and apparatus for time-resolved acquisition of magnetic resonance data in an examination region of a magnetic resonance imaging scanner, an object being examined is placed on a table and is continuously moved through the examination region, magnetic resonance signals are acquired from the examination region while the object being examined is continuously moved with the table through the examination region and prior to the acquisition of magnetic resonance signals, a phase coding that corresponds to a position in k-space, for the purpose of sampling k-space, is carried out. An interruption of the movement of the table takes place at a predetermined table position, and the acquisition of magnetic resonance signals from an examination region is continued over the course of a predetermined time period, while the table (08-05-2010
20100194389METHOD FOR DYNAMIC MOTION GUIDED FUNCTIONAL MAGNETIC RESONANCE IMAGING - A method for imaging neuromuscular coupling and sensory processing with magnetic resonance imaging (“MRI”) is provided. More specifically, a method for examining the control that a subject's brain has over muscular motion, including both prompted and incidental actions, is provided. A dynamic acquisition is performed to rapidly acquire anatomical images of a desired muscle. This dynamic acquisition is interleaved with a functional acquisition that targets the cortical areas that are responsible for controlling, or processing, signals from the desired muscular region. By interleaving these two acquisitions, synchronized image information about the motion of the muscle along with the neuronal activity associated with the control of the muscle is acquired. Interleaving these data acquisitions also allows imaging of brain and muscle at substantially the same time, thereby reducing errors and pinpointing activity.08-05-2010
20100148774MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes an imaging unit and a compensation unit. The imaging unit acquires image data by imaging with applying a pre-pulse for controlling a contrast. The compensation unit suppresses a remanent magnetic field having an intensity according to a slice position. The remanent magnetic field is at an application timing of the pre-pulse and due to an eddy current generated by at least one gradient magnetic field applied before applying the pre-pulse.06-17-2010
20110187368MAGNETIC RESONANCE METHOD AND SYSTEM TO CREATE AN IMAGE DATA SET - In a magnetic resonance method and system to create a difference image, essentially only one k-space point in a k-space data set belonging to the difference image is acquired at least twice in the form of k-space measurement values after a radiation of an RF excitation pulse. The difference image is thereby created depending on acquired k-space data set by means of taking the difference of the respective at least two results acquired per k-space point. For each essentially only one k-space point shift multiple phase coding gradients are activated in respective spatial directions, followed by a first readout of the essentially only one k-space point for an acquisition of a first of the k-space measurement values. The phase coding gradients are subsequently modified such that a gradient moment for each of the phase coding gradients is zero for a time period from the first readout of the essentially only one k-space point up to a second readout of the essentially only one k-space point. The essentially only one k-space point is subsequently read out a second time.08-04-2011
20110187367METHOD AND MAGNETIC RESONANCE SYSTEM TO REDUCE DISTORTIONS IN DIFFUSION IMAGING - In a method and magnetic resonance apparatus to reduce distortions in magnetic resonance diffusion imaging, a magnetic resonance data acquisition system is operated to acquire magnetic resonance data in a first measurement with a first diffusion weighting, and to acquire magnetic resonance data in a second measurement with a second, different diffusion weighting. A non-linear, system-specific distortion-correcting function is determined on the basis of system-specific information that is specific to said magnetic resonance data acquisition system. Correction parameters are calculated to correct distortions in subsequently-acquired diffusion-weighted magnetic resonance images, based on the data acquired in the first and second measurements with the system-specific distortion-correcting function applied thereto. The subsequently-acquired diffusion-weighted magnetic resonance images are corrected using the correction parameters to at least reduce distortions therein.08-04-2011
20110187366METHOD AND MAGNETIC RESONANCE DEVICE FOR IMAGING OF PARTICLES - In a magnetic resonance method and apparatus for imaging a particle that is located in an examination subject, a pulse sequence is emitted that includes an excitation pulse that generates a transverse magnetization of the examination subject from a magnetization appearing in a basic magnetic field, so the particle causes a magnetic interference field in the applied basic magnetic field in a magnetic resonance measurement. After the excitation pulse, at least one spectrally selective refocusing pulse is generated in a non-resonant frequency range at the generation of a spin echo.08-04-2011
20110187365MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - In one embodiment, a magnetic resonance imaging apparatus includes an input unit and a direction setting unit. The input unit receives a setting operation to set a plurality of image taking regions within a position determining image, from an operator of the apparatus. The direction setting unit sets phase encoding directions for the plurality of image taking regions to be in the same direction as one another, regardless of setting operations performed by the operator via the input unit.08-04-2011
20110187364DETERMINING A POSITION OF A SUBAREA OF AN OBJECT UNDER EXAMINATION AND THE STRUCTURE THEREOF IN A MAGNETIC RESONANCE SYSTEM - A method is disclosed for determining a location of a subarea of an area under examination in a magnetic resonance system. The subarea is arranged at the edge of a field-of-view of the magnetic resonance system. In at least one embodiment of the method, at least one slice position is determined for an MR image in which the B08-04-2011
20110148413MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus according to an embodiment includes a data gathering unit and an image generating unit, the data gathering unit gathers magnetic resonance data in a non-contrast manner by applying a first readout gradient pulse having a zero-order moment of 0 and a second readout gradient pulse having a zero-order moment of 0 and a first-order moment of a value different from a value of a first-order moment of the first readout gradient pulse to a region of interest including a fluid in motion, and the image generating unit periodically arranges first magnetic resonance data read out with the first readout gradient pulse and second magnetic resonance data read out with the second readout gradient pulse in at least one of a phase encoding direction and a slice encoding direction in a k-space to generate k-space data and reconstructs the k-space data to generate an image in which a fluid image and a static part image surrounding the fluid are spatially separated from each other.06-23-2011
20110148411SAR DOSIMETER FOR RF POWER DEPOSITION IN MRI AND METHODS AND SYSTEMS RELATED THERETO - Featured is a dosimeter device that measures SAR deposited by RF power deposition during MRI of a specimen. Such a dosimeter device includes a transducer that is configured to present a load to the MRI scanner in which the transducer is located and to provide an output representative of signals induced in the transducer. The transducer also is configured so that the presented load is substantially equivalent to another load which would be presented by the specimen during MRI of the specimen. Such a transducer also is configured so as to generate an MRI signal that is sufficient to allow the MRI scanner to adjust the RF power to a value substantially equal to that of the specimen. Also featured are methods for measuring SAR deposited by RF power deposition and apparatuses or system embodying such a dosimeter device.06-23-2011
20110148412MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, an MRI apparatus includes a calculation unit and an imaging unit. The calculation unit calculates “a value of a parameter having an upper limit” for “a plurality of patterns of scan orders for a plurality of scan operations for an object” respectively. The imaging unit generates image data for each of the scan operations by performing the plurality of scan operations based on a result of the calculation.06-23-2011
20100026297METHOD FOR RELAXATION-COMPENSATED FAST MULTI-SLICE CHEMICAL EXCHANGE SATURATION TRANSFER MRI - A volumetric APT imaging sequence is provided that acquires multi-slice images immediately after a single long continuous wave (CW) RF irradiation, wherein the relaxation-induced loss of CEST contrast is compensated for during post-processing. Thus, a fast volumetric pH-weighted APT imaging technique is provided.02-04-2010
20100026299METHOD FOR RADIO-FREQUENCY NUCLEAR MAGNETIC RESONANCE IMAGING - Accumulated spin magnetization phase within a RF MRI procedure can be used for providing an orderly k-space traversal. By operating a transmit array adapted to produce two B1 fields in alternation, where the B1 fields are substantially uniform in amplitude over a sample volume of the MRI setup, and the B1 fields have respective spatial phase distributions such that selection of a difference in spatial derivatives of the spatial phase distributions permits control over a size of a step in k-space applied by successive refocusing pulses for generating the B1 fields in alternation. Each alternating refocusing pulse issued within a T2 time causes a step through k-space in an encoding direction determined by the difference in spatial derivatives.02-04-2010
20100026298Method for imaging Acoustically induced rotary saturation with a magnetic resonance imaging system - A method for producing a magnetic resonance image indicative of mechanical waves applied to a subject is provided. Mechanical waves are applied to the subject at a selected frequency to induce oscillatory motion in tissues within the subject at the same frequency. A spin-lock radiofrequency pulse, having a resonance frequency matched to that of the induced oscillatory motion, is applied to the subject. This results in a spin-lock condition, during which transverse magnetization experiences rotary saturation resulting from magnetic field fluctuations produced by the oscillatory motion. Image data is acquired from the saturated transverse magnetization and images are reconstructed. As a result of the rotary saturation, these images exhibit darkening in those voxel locations affected by the oscillatory motion. In this manner, an image indicative of the applied mechanical waves is produced.02-04-2010
20100019765METHOD AND APPARATUS FOR ACQUIRING A MAGNETIC RESONANCE IMAGE OF TISSUE CONTAINING IRON OXIDE - In a method and apparatus for acquisition of a magnetic resonance (MR) image of tissue containing iron oxide particles frequency-selective inversion of the longitudinal magnetization in the tissue is done before acquisition of the MR image, and acquisition of the MR image is done at a zero crossing of the longitudinal magnetization. For water portions of the tissue, multiple inversion pulses that invert the longitudinal magnetization of the aqueous portions are radiated into the tissue. For fat portions of the tissue, multiple inversion pulses are radiated into the tissue that invert longitudinal magnetization of the fat portions. The inversion pulses for the respective tissue portions individually exhibit a fixed time interval from one another.01-28-2010
20100019764UNIFORM MAGNETIC FIELD SPHERICAL COIL FOR MRI - The present invention relates to a spherical design for a magnetic resonance imaging (MRI) coil to provide a compact and light-weight highly uniform magnetic field for a variety of medical imaging applications. A preferred embodiment of the invention provides a transportable MRI system in which the spherical electromagnet can be worn like a helmet by patients for diagnosis and assessment of traumatic brain injuries, for example.01-28-2010
20090096448b-Value Optimization for Diffusion Weighted Magnetic Resonance Imaging - A method for selecting the b-values for diffusion weighted magnetic resonance scans. The method includes: identifying a single reference slice within a volume of interest (VOI); progressively changing b-values over a plurality of scans of the reference slice wherein each one of the scans has a different b-value to obtain a plurality of diffusion weighted images; calculating ADC maps for combinations of b-values from the obtained plurality of diffusion weighted images; evaluating the calculated ADC maps; selecting from the evaluation optimal b-values; and using the selected b-values for subsequent scans.04-16-2009
20090174405MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a generation unit configured to generate a magnetic field, a reconstruction unit configured to reconstruct an image for a subject on the basis of a magnetic resonance signal radiated from the subject in the magnetic field, a presumption unit configured to presume a distribution of an image quality deterioration degree occurring in the image on the basis of a precision at which the generation unit generates the magnetic field, and a creation unit configured to create a display image showing the distribution of the image quality deterioration degree on the image.07-09-2009
20080278164NOVEL METHOD FOR SEQUENCE DETERMINATION USING NMR - The invention relates to methods for analyzing polysaccharides. In particular, compositional and sequence information about the polysaccharides are derived. Some methods use NMR in conjunction with another experimental method, such as, capillary electrophoretic techniques for the analysis.11-13-2008
20100301855Systems, devices, methods, and compositions including targeted ferromagnetic structures - Magnetic resonance systems, devices, methods, and compositions are provided. A nuclear magnetic resonance imaging composition includes, but is not limited to, a plurality of target-selective ferromagnetic microstructures configured to generate a time-invariant magnetic field within at least a portion of one or more internal surface-defined voids.12-02-2010
20100244827Simultaneous excitation and acquisition in magnetic resonance - A method for magnetic resonance spectroscopy (=MRS) or magnetic resonance imaging (=MRI) in which an NMR time-domain signal is created by an RF excitation pulse applied to an object in the presence of an applied magnetic field that may depend on spatial position and/or time, the time-domain signal being generated by an excited transverse nuclear magnetisation precessing about the applied magnetic field, whereby the RF excitation pulse is adapted to cover a whole range of NMR frequencies of interest present in the object, and time-domain signal acquisition takes place during, or during and after the application of the RF excitation pulse, is characterized in that spectral or image data are reconstructed by a matrix product of a reconstruction matrix and a vector of time-domain signal points, the reconstruction matrix being an inversion of an encoding matrix A09-30-2010
20100102813PET/MR SCANNERS FOR SIMULTANEOUS PET AND MR IMAGING - In a combined system, a magnetic resonance (MR) scanner includes a magnet (04-29-2010
20110115487METHOD AND MAGNETIC RESONANCE SYSTEM FOR IMAGING PARTICLES - A method and magnetic resonance system for imaging a particle that is located in an examination subject with an imaging magnetic resonance measurement execute a gradient echo sequence in which at least two gradient echoes are acquired following a single excitation pulse, wherein the particle in an applied basic magnetic field causes a magnetic interference field. An RF pulse is radiated to generate a transverse magnetization from a magnetization appearing in the basic magnetic field. A first dephasing gradient is shifted to adjust a first dephasing of the transverse magnetization, and the first gradient echo is acquired. A second dephasing gradient is shifted to adjust a second dephasing of the transverse magnetization that is different than the first dephasing, and the second gradient echo is acquired. The two dephasing gradients are shifted such that a dephasing of the transverse magnetization caused by the interference field of the particle is at least partially compensated in a region around the particle or within the particle given the acquisition of at least one of the echoes.05-19-2011
20120146641Multi-dimensional cardiac imaging - A 5-dimensional imaging method and system is provided to acquire and display the effect of dynamic physiologic changes (either spontaneous or induced) on cardiac function of a patient's heart to elucidate their effects on diastolic myocardial function. In a patient free-breathing magnetic resonance imaging study, 3-dimensional spatial information is encoded by a non-Cartesian 3-dimensional k-space readout trajectory and acquired concurrently with recordings of cardiac and respiratory cycles. The advantage of using non-Cartesian sampling in this invention compared to, for example, Cartesian sampling is higher scan acceleration, improved robustness to motion/flow effects (incoherent instead of coherent artifacts) and robustness to missing data points in k-space.06-14-2012
20120146639METHOD FOR TWO-DIMENSIONAL CORRELATION MAGNETIC RESONANCE SPECTROSCOPY - Methods for low-power in vivo localized multi-dimensional correlated magnetic resonance spectroscopy (“MRS”) are provided. Low-power adiabaticity is achieved, generally, using gradient-modulated radio frequency pulses for localization and mixing. The provided pulse sequences also provide a mechanism for longitudinal mixing, which significantly increases the efficiency of magnetization transfer and thereby increases signal-to-noise ratio.06-14-2012
20110304332INTELLIGENT CARTILAGE SYSTEM - The exemplary embodiments of the present disclosure are described and illustrated below to encompass methods and devices for designing patient specific prosthetic cutting jigs and, more specifically, to devices and methods for segmenting bone of the knee and the resulting cutting guides themselves. Moreover, the present disclosure relates to systems and methods for manufacturing customized surgical devices, more specifically, the present disclosure relates to automated systems and methods of arthroplasty cutting guides, systems and methods for image segmentation in generating computer models of knee joint.12-15-2011
20110304331MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - According to one embodiment, a magnetic resonance imaging apparatus includes an image generating unit, a judging unit and a correction unit. The image generating unit receives, from an object, a magnetic resonance signal caused by transmission of an RF pulse to cause a nuclear magnetic resonance, and generates image data of the object based on the magnetic resonance signal. The judging unit identifies an implant region where an implant part exists inside the object, based on the image data. The correction unit acquires magnetic resonance frequency information from a body region which is a region inside the object excluding the implant region, and corrects a center frequency of the RF pulse based on the magnetic resonance frequency information.12-15-2011
20120306493ELECTRIC PROPERTIES TOMOGRAPHY IMAGING METHOD AND SYSTEM - The invention relates to a magnetic resonance method of electric properties tomography imaging of an object, the method comprising: applying an excitation RF field to the object via a coil at a first spatial coil position (12-06-2012
20120306492PENETRATION TUBE ASSEMBLIES FOR REDUCING CRYOSTAT HEAT LOAD - A penetration assembly for a cryostat is presented. The penetration assembly includes an outer wall member having a first end and a second end and configured to alter an effective thermal length of the wall member, wherein a first end of the tube is communicatively coupled to a high temperature region and the second end of the tube is communicatively coupled to a cryogen disposed within a cryogen vessel of the cryostat. In addition, the penetration tube assembly includes a telescoping inner wall member comprising a plurality of tubes nested within one another, and wherein each tube in the plurality of tubes is operatively coupled to at least one other tube in series.12-06-2012
20110304330PHASE DIFFERENCE ENHANCED IMAGING METHOD (PADRE), FUNCTIONAL IMAGE CREATING METHOD, PHASE DIFFERENCE ENHANCED IMAGING PROGRAM, PHASE DIFFERENCE ENHANCED IMAGING APPARATUS, FUNCTIONAL IMAGE CREATING APPARATUS, AND MAGNETIC RESONANCE IMAGING (MRI) APPARATUS - A functional image creating method and a functional image creating apparatus, each enabling rendering of an activated region, are provided. A phase difference image PDr(x) is created using a complex image σr(x) created from an MR signal in an inactive state and a complex image σ′r(x) obtained by filtering the complex image σr(x). A phase difference image PDa(x) is created using a complex image σa(x) created from an MR signal in an active state and a complex image σ′a(x) obtained by filtering the complex image σa(x). Function signal images diff12-15-2011
20090230959METHODS OF USING COMBINED FORWARD AND BACKWARD SAMPLING OF NUCLEAR MAGNETIC RESONANCE TIME DOMAIN FOR MEASUREMENT OF SECONDARY PHASE SHIFTS, DETECTION OF ABSORPTION MODE SIGNALS DEVOID OF DISPERSIVE COMPONENTS, AND/OR OPTIMIZATION OF NUCLEAR MAGNETIC RESONANCE EXPERIMENTS - The present invention relates to a method of conducting an N-dimensional nuclear magnetic resonance (NMR) experiment in a phase-sensitive manner by the use of forward and backward sampling of time domain shifted by a primary phase shift under conditions effective to measure time domain amplitudes and secondary phase shifts. The present invention also relates to methods of conducting an N-dimensional NMR experiment in a phase-sensitive manner by the use of dual forward and backward sampling of time domain shifted by a primary phase shift under conditions effective to measure secondary phase shifts or at least partially cancel dispersive and quadrature image signal components arising in the frequency domain from secondary phase shifts.09-17-2009
20100277174PASSIVE SHIMS TO INCREASE THE EFFECTIVE B0 and B1 UNIFORMITY IN A BODY COIL - A magnetic resonance imaging system (11-04-2010
20100134103System and Method For Ghost Magnetic Resonance Imaging - A system and method enables the creation of medical images using data related to ghost artifacts. The method thus allows components of an imaged subject to be segmented based on state changes in the components that lead to the controlled production of ghost artifacts. This is achieved in MR by performed a pulse sequence so that multiple sets of MR data are acquired in which the signals from a target tissue vary across the data sets while the signals from a background tissue do not vary across the data sets. A composite data set is generated by populating selected k-space lines of the composite data set with information from a first MR data set and populating the remaining k-space lines of the composite data set with information from a second MR data set. An MR image is then reconstructed from the composite data set. The MR image contains ghost artifacts that faithfully reproduce the 2D or 3D anatomic detail of the target tissues without signal contributions from the background tissues, allowing for background-suppressed or segmented MR images of a target tissue without the need for image subtraction.06-03-2010
20110018538NMR DEVICE FOR DETECTION OF ANALYTES - This invention relates generally to detection devices having one or more small wells each surrounded by, or in close proximity to, an NMR micro coil, each well containing a liquid sample with magnetic nanoparticles that self-assemble or disperse in the presence of a target analyte, thereby altering the measured NMR properties of the liquid sample. The device may be used, for example, as a portable unit for point of care diagnosis and/or field use, or the device may be implanted for continuous or intermittent monitoring of one or more biological species of interest in a patient.01-27-2011
20110050226RF COIL FOR MR IMAGING WHICH IS NOT VISIBLE IN X-RAY IMAGE - An RF coil used for MR imaging is designed so that it remains in place in the field of view of an X-Ray imaging system and comprises a support board on which copper conductive traces and copper printed capacitors are carried. The attenuation of the X-Rays caused by the copper traces is visible in the radiation image but this is compensated by arranging the non-conductive material of the support board such that the attenuation of substantially the whole of the RF coil located within the field of view is substantially constant throughout the field of view.03-03-2011
20100097061APPARATUS AND METHOD FOR DETECTING AND CLASSIFYING ATHEROSCLEROTIC PLAQUE HEMORRHAGE - A system and method for detecting atherosclerotic plaque hemorrhage includes a controller programmed to apply a non-selective inversion recovery RF pulse to a region of interest, apply a plurality of encoding sequences to the region of interest to cause generation of a plurality of echoes during application of each encoding sequence. The controller is further programmed to acquire three dimensional MR data from the region of interest during generation of each of the plurality of echoes, identify a hemorrhage based on the three dimensional MR data, characterize a type of the hemorrhage, and reconstruct an image based on the three dimensional MR data, the image comprising the characterized hemorrhage.04-22-2010
20110316536RAPID SAMPLE EXCHANGE FOR MINIATURIZED NMR SPECTROMETER - A method is provided for acquiring multiple NMR response signal data in rapid succession for averaging NMR spectral data from a sample. The fluid sample is placed in a capillary that extends through the magnetic field of the NMR spectrometer, including through the center of the magnetic field to place a segment of the sample in the magnetic center. After the sample fluid, initially magnetized by the magnetic field, is activated to emit an NMR pulse signal, the fluid in the capillary is advanced rapidly to put another pre-magnetized segment of the sample fluid in the fluid center, acquiring an NRM pulse signal, and continuing the cycle until a desired number of NMR response data signals from the sample have been acquired. Those response data from multiple acquisitions are then averaged.12-29-2011
20120043964Method and system for simulating magnetic resonance imaging signals - A method for simulating magnetic resonance signals is proposed. A lattice array where each point in the array has several magnetic resonance sensitive particles is provided. Statistic property of each point is set. A raw magnetic resonance imaging data is calculated based on statistic property of each point and a magnetic resonance imaging sequence to be applied. A system for simulating magnetic resonance signals is further proposed. By considering statistic property of each point, it can distinguish every part of the object to be scanned and really reflect the structure of object without using a real magnetic resonance imaging device. It saves time and costs for avoiding several scanning by the real a magnetic resonance imaging device.02-23-2012
20100072999Device and method for positioning a small animal for an MRI measurement - A device used in performing imaging magnetic resonance measurements (=MRI) in a Region of Interest (ROI) (03-25-2010
20110156704B1-MAPPING AND B1L-SHIMMING FOR MRI - The invention relates to a method of acquiring MRI image data comprising the following steps: performing a 3-dimensional B1 mapping of a first volume using a first voxel size, selecting an MRI protocol, performing the B1-shim in accordance with the MRI protocol, performing the MRI protocol to acquire MRI imaging data of a second volume using a second voxel size, wherein the first voxel size is larger than the second voxel size, wherein the first volume is larger than the second volume, and wherein the second volume is contained within the first volume.06-30-2011
20120001633MR IMAGING USING PARALLEL SIGNAL ACQUISITION - The invention relates to a method of MR imaging of at least a portion of a body (01-05-2012
20120001631ULTRA-LOW FIELD NUCLEAR MAGNETIC RESONANCE METHOD TO DISCRIMINATE AND IDENTIFY MATERIALS - An ultra-low field (ULF) nuclear magnetic resonance (NMR) and/or magnetic resonance imaging (MRI) system can be used for rapid identification and discrimination of materials, e.g., liquid in opaque containers and/or materials in or on human bodies. The system utilizes the ability of ULF NMR/MRI to measure NMR parameters in magnetic fields that can be easily changed in field strength and orientation.01-05-2012
20120001632MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD OF CONTROLLING IMAGE CONTRAST - A magnetic resonance imaging apparatus includes a data acquisition unit and an image data generating unit. The data acquisition unit acquires MR signals for imaging by an imaging scan with a frequency-selective or slice-selective radio frequency intermediate pulse for controlling a contrast and a spoiler gradient magnetic field for suppressing unnecessary signal component after applying at least one of radio frequency excitation pulses. The image data generating unit generates image data based on the magnetic resonance signals.01-05-2012
20100253343SYSTEM, METHOD AND COMPUTER ACCESSIBLE MEDIUM FOR PROVIDING HYBRID ADIABATIC-RECTANGULAR PULSE TRAIN FOR EFFECTIVELY COMPLETE SATURATION OF MAGNETIZATION WITHIN AN ANATOMICAL STRUCTURE - According to exemplary embodiments of the present disclosure, it is possible to provide system, method and computer-accessible medium to facilitate a hybrid adiabatic-rectangular pulse train for saturation of magnetization within an anatomical structure. Using such exemplary embodiments, it is possible to determine information by combining a first information associated with a first nonselective rectangular radio frequency (RF) pulse, a second information associated with a second nonselective rectangular RF pulse, and a third information associated with a nonselective adiabatic half-passage pulse. Further, it is possible to rotate the longitudinal magnetization onto a particular plane (e.g., the transverse plane) based on the information. In addition, it is possible to minimize and/or achieve the residual longitudinal magnetization to be less than a predetermined threshold value (e.g., 2% of equilibrium magnetization) within the anatomical structure using a configuration of RF pulses.10-07-2010
20120056621Method For Imaging A Portion Of An Examination Object In A Magnetic Resonance Scanner - A method is disclosed for imaging a portion of an examination object in a magnetic resonance scanner. The portion is arranged at the edge of a field of view of the magnetic resonance scanner. During at least one embodiment of the method, a gradient field is produced such that a nonlinearity in the gradient field and a B03-08-2012
20120056622METHOD TO CONTROL A MAGNETIC RESONANCE DEVICE FOR IMAGE ACQUISITION, AND CORRESPONDING MAGNETIC RESONANCE DEVICE - In a method to control a magnetic resonance device for image acquisition in at least one slice, the magnetic resonance device has a radio-frequency antenna with multiple transmission channels. At least one slice deviates from a cuboid shape and/or that is roughly adapted to a target volume of interest that is to be acquired, and/or at least one saturation volume adapted to a shape in a subject to be acquired, are defined automatically and/or manually via a user interface. The selection of possible slices and/or saturation volumes is limited automatically under consideration of the technical embodiment of the radio-frequency antenna. The image acquisition takes place in the selected slice and/or under consideration of the saturation volume.03-08-2012
20120007599UPPER STACK FOR A NUCLEAR MAGNETIC RESONANCE SPECTROMETER APPARATUS AND ASSOCIATED METHOD OF OPERATING A NUCLEAR MAGNETIC RESONANCE SPECTROMETER APPARATUS - An upper stack for a nuclear magnetic resonance spectrometer apparatus includes a cryostat having one or more chambers for holding samples in a frozen state. A sample loading tube that also allows He delivery extends to the cryostat, and a sample changer mechanism is disposable at least in part proximate to the cryostat for moving specimens from the cryostat to an NMR probe where they can be heated and melted using inductive heating. A sample ejection tube extends from the sample changer mechanism allowing a clear path for heating a sample in an NMR probe using a laser beam.01-12-2012
20120013337SAR HOTSPOT REDUCTION BY TEMPORAL AVERAGING IN PARALLEL TRANSMISSION MRI - A magnetic resonance sequence includes a repetitively applied radiofrequency B01-19-2012
20120013336MAGNETIC RESONANCE IMAGING WITH IMPROVED IMAGING CONTRAST - A method of magnetic resonance imaging of an object comprises the steps of arranging the object in a stationary magnetic field, subjecting the object to an excitation and encoding sequence of magnetic field gradients resulting in k-space sampling in two segments along the phase encoding direction, wherein the encoding sequence of the magnetic field gradients is selected such that the two segments in k-space are sampled along trajectories beginning with a central k-space line through the k-space center and continuing to opposite k-space borders of the two segments, collecting magnetic resonance signals created in the object, and reconstructing an image of the object based on the magnetic resonance signals, wherein one central k-space line is sampled in both of the two k-space segments, and intersegment phase and/or intensity deviations are corrected in both k-space segments using the magnetic resonance signals collected along the central k-space line. Furthermore, an imaging device for magnetic resonance imaging of an object is described.01-19-2012
20120056620MULTIPLICATIVE INCREASE IN MRI DATA ACQUISITION WITH MULTI-BAND RF EXCITATION PULSES IN A SIMULTANEOUS IMAGE REFOCUSING PULSE SEQUENCE - Disclosed are methods and systems for carrying out super-multiplexed magnetic resonance imaging that entwines techniques previously used individually and independently of each other in Simultaneous Echo (of Imaging) Refocusing (SER or SIR) and Multi-Band (MB) excitation, in a single pulse sequence that provides a multiplication rather than summation of desirable effects while suppressing undesirable effects of each of the techniques that previously were used independently.03-08-2012
20120206140System And Method For Generating A Magnetic Resonance Image Using Prospective Motion Correction And Parallel Imaging - A method for generating a magnetic resonance (MR) image includes acquiring MR data from each of a plurality of RF coils and applying a prospective motion correction method to the MR data for each RF coil including determining a set of motion measurements that include a scan plane orientation associated with each data point in the MR data. The MR data for each RF coil is divided into a plurality of scan plane orientation groups based on motion changes. A set of unaliasing coefficients is generated for each scan plan orientation group and applied to the MR data to synthesize data for each RF coil. The acquired MR data and synthesized data for each RF coil is combined to generate a scan plane orientation data set. Each scan plane orientation data set is combined to generate a complete k-space data set.08-16-2012
20120025826Method For Reducing Artifacts In Magnetic Resonance Imaging - Disclosed are methods for magnetic resonance imaging (MRI) that reduce the appearance of fast spin echo cups artifacts using a slice-titting gradient. In particular, the excited image slice is titted relative to the image slice selected by the refocusing RF pulse.02-02-2012
20120025825METHOD AND MAGNETIC RESONANCE APPARATUS FOR DYNAMIC PHASE CORRECTION IN A MULTI CHANNEL RF TRANSMISSION - In a method and magnetic resonance (MR) apparatus to acquire spin echo-based MR signals of an examination subject with a multi-spin echo sequence with multiple refocusing pulses after a single excitation pulse in an MR system that has a multichannel RF transmission and reception module: detect a spatial, two-dimensional phase distribution in the examination subject is detected by acquiring navigator signals, a phase and amplitude distribution for the individual transmission channels of the RF transmission and reception module is calculated to generate a magnetic field B02-02-2012
20120025824METHOD AND MAGNETIC RESONANCE SYSTEM TO GENERATE MAGNETIC RESONANCE IMAGES - In a method to create magnetic resonance (MR) images of a predetermined volume segment within an examination subject by operation of an MR system with continuous table displacement, at least one slice with a respective, predetermined thickness is defined, and for each slice, a partial region of the slice is selected, the respective partial region being bounded in a direction perpendicular to the thickness direction of the corresponding slice, and measurement signals are acquired from the slice, the acquired measurement signals originating from only the respective partial region of the slice.02-02-2012
20120025823METHOD AND DEVICE FOR MAGNETIC RESONANCE IMAGING - In a methods and devices for magnetic resonance (MR) imaging, an MR data acquisition is implemented repeatedly in which an examination subject is exposed to an alternating magnetic field with a frequency before the readout sequence. The signal values acquired after the preparation of the magnetization with alternating fields of respectively different frequencies are evaluated. Magnetic field data that contain information about the curve of the basic field are used to implement the MR data acquisitions, such as to establish the frequencies, and/or in the evaluation of the signal values.02-02-2012
20120025822Method of MR (=magnetic resonance) with spatial encoding to generate an image of spectroscopic data - A method of MR with spatial encoding to generate an image or spectroscopic data of an object of investigation inside an MR apparatus comprises the steps of (a) selecting a volume of interest within the object of investigation, (b) applying an RF pulse to generate a transverse magnetization within the object of investigation, (c) preparing a nonlinear phase distribution within the object of investigation by application of spatially encoding magnetic fields (SEMs), the SEMs comprising of a nonlinear gradient field or a combination of linear and nonlinear gradient fields, (d) effecting primary spatial encoding through application of SEMs, and (e) recording MR signals originating from the object of investigation. Step (c) or (d) thereby comprises applying a sequence of at least two SEMs, at least one of which contains a nonlinear field gradient and at least two of the SEMs having different field geometries. The sequence of SEMs is applied at a point in time from and including the excitation of the object of interest in step (b) up to and including the recording of the MR signals in step (e), to thereby introduce a temporal shift of the signals arising from spatially different locations within the selected volume of interest, that is to thereby introduce a shift of local spatial frequency components. A sampling window for recording of the respective MR signals is set and signals originating from the volume of interest are recorded in step (e) and undesired signals originating from outside the volume of interest are suppressed.02-02-2012
20090134872METHOD AND APPARATUS OF MULTI-COIL MR IMAGING WITH HYBRID SPACE CALIBRATION - The present invention provides a system and method for parallel imaging that performs auto-calibrating reconstructions with a 2D (for 2D imaging) or 3D kernel (for 3D imaging) that exploits the computational efficiencies available when operating in certain data “domains” or “spaces”. The reconstruction process of multi-coil data is separated into a “training phase” and an “application phase” in which reconstruction weights are applied to acquired data to synthesize (replace) missing data. The choice of data space, i.e., k-space, hybrid space, or image space, in which each step occurs is independently optimized to reduce total reconstruction time for a given imaging application. As such, the invention retains the image quality benefits of using a 2D k-space kernel without the computational burden of applying a 2D k-space convolution kernel.05-28-2009
20090134871MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a data acquisition unit and an image generating unit. The data acquisition unit acquires MR data according to an imaging condition for obtaining a SSFP in flowing matter by applying excitation pulses having a same flip angle with a constant TR and gradient magnetic fields to an object. The image generating unit generates an image of the flowing matter based on the MR data.05-28-2009
20120062229Method And System For Magnetic Resonance Imaging, And Use Thereof - The present invention refers to a method for magnetic resonance imaging or nuclear magnetic resonance spectroscopy comprising emitting a radio frequency and gradient pulse sequence towards an object being subjected to a magnetic field, wherein said object comprises a molecule having an atom with a nuclear spin differing from 0, encoding, detecting and acquiring a magnetic resonance signal from said object corresponding to said emitted radio frequency and gradient pulse sequence, wherein the radio frequency and gradient pulse sequence comprises a first weighting block, a mixing block with duration t03-15-2012
20120062228PREPARATION OF POLYAMIDE BLOCK COPOLYMERS - This invention relates to the preparation of polyamide block copolymers by sequential monomer addition. More particularly, it relates to catalysts capable of copolymerizing not only cyclic amides, but other monomers such as cyclic esters and epoxides as well, using sequential addition so as to produce useful and novel block copolymers.03-15-2012
20120062226DEVICE FOR PARTICULATE NMR SAMPLES IN A FLUID AND RELATED METHODS - Devices and related methods for nuclear magnetic resonance (NMR) analysis of particulate materials are provided including a detector chamber configured for insertion into an NMR spectrometer and configured to receive particulate materials in a fluid. A circulation chamber is attached to and in fluid communication with a first end of the detector chamber. A transition region is between the detector chamber and the circulation chamber, and a fluid supply interface is at a second end of the detector chamber that is configured to attach to a fluid source. The detector chamber, the circulation chamber and the transition region are sized and configured such that, when fluid flows from the fluid supply interface into the second end of the detector region, a circulating current is formed in the transition region and/or the circulation chamber such that the particulate matter is contained in the circulation chamber by the circulating current.03-15-2012
20120062227METHOD FOR MAGNETIC RESONANCE IMAGING USING INVERSION RECOVERY WITH ON-RESONANT WATER SUPPRESSION INCLUDING MRI SYSTEMS AND SOFTWARE EMBODYING SAME - Featured are methods for magnetic resonance imaging of a volume, such a volume having susceptibility-generating objects or interfaces having susceptibility mismatches therein. Such a method includes selectively visualizing one of susceptibility-generating objects or interfaces having susceptibility mismatches as hyperintense signals, where such visualizing includes controlling variable imaging parameters so as to control a geometric extent of a signal enhancing effect, m more particular aspects of the present invention, such selectively visualizing includes attenuating or essentially suppressing signals from fat and/or water, namely on-resonant water protons, so as to thereby enhance a signal(s) associated with magnetic susceptibility gradient(s). Also featured are MRI systems, apparatuses and/or applications programs for execution on a computer system controlling the MRI data acquisition process embodying such methods.03-15-2012
20090134870METHOD AND DEVICE FOR MAGNETIC RESONANCE IMAGING ON THE BASIS OF A PARTIALLY PARALLEL ACQUISITION (PPA) - In a method, apparatus and computer-readable medium for magnetic resonance imaging of a contiguous region of a human body on the basis of partially parallel acquisition (PPA) by excitation of nuclear spins and measurement of radio-frequency signals representing the excited spins, are implemented. A k-space single channel reference image [R_kal] is calculated from the previously measured reference lines of a sub-coil series of N sub-coils with a phase-sensitive combination method. A GRAPPA coefficient matrix [W] is calculated by solving the equation system [R_kal]=[W]×[I_kal] wherein [I_kal] represents one block from the sub-coil series. A k-space single channel image [R] is successively completed by applying [W] to successive blocks [I_z] shifted relative to one another, the blocks [I_z] being of a previously measured, under-sampled sub-coil series of the N sub-coils, and [R] is transformed into image space.05-28-2009
20090121713Antenna For Picking up Magnetic Resonance Signals and Provided With Its Own Communication Unit - An RF receiver antenna (05-14-2009
20100171497MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus includes a scan execution unit configured to execute a regular scan in which a navigator sequence for generating a magnetic resonance signal in a navigator area containing a region of interest moving with a biological movement of a subject and an imaging sequence for generating a magnetic resonance signal in an imaging area of the subject are carried out, and a signal processing unit configured to detect a position of a region of interest based on a magnetic resonance signal generated by a navigator sequence in the regular scan and to generate an image based on the detected position and the magnetic resonance signal generated by the imaging sequence. The signal processing unit is configured to generate an intensity profile with respect to the magnetic resonance signal generated by a navigator sequence in the pre-scan and received at each of the coil elements, determine the gradient polarity of the profile line corresponding to the high-signal substance in the predetermined direction in the generated intensity profile, and to select a coil element that received a magnetic resonance signal of the intensity profile highest in maximum signal intensity among the intensity profiles the gradient polarity of which was determined to face upward. The position of the region of interest is detected based on a magnetic resonance signal generated by a navigator sequence in the regular scan and received at the selected coil element.07-08-2010
20130009640MAGNETIC FIELD INSENSITIVE CEST IMAGING - In a method for accelerated CEST imaging in magnetic resonance tomography, RF pulses for the saturation of the protons of the substance to be shown are emitted by several transmission coils, and shape of these RF pulses is calculated using an optimization method so that a weighted sum is minimized, the sum exhibiting at least two of the following norms: the norm of the magnetization of free water protons in each point in space, the norm of the deviation of the magnetization of the bound protons from an inverted magnetization in each point in space and the norm of the magnetization of protons with an inverted shift relative to the predefined frequency shift in each point in space. The shape of the RF pulses for subsequent excitation of the free water protons also can be calculated for the optimization method.01-10-2013
20120105060Use Of Strongly Modulating Pulses In MRI For Providing Chemical Shift Selective Flip Angles - A method of performing nuclear magnetic resonance imaging of a body comprising at least two populations of nuclei characterized by different spin resonance frequencies, the method comprising the steps of: (a) immerging said body (B) in a static magnetic field (B05-03-2012
20090134869NMR device for detection of analytes - This invention relates generally to detection devices having one or more small wells each surrounded by, or in close proximity to, an NMR micro coil, each well containing a liquid sample with magnetic nanoparticles that self-assemble or disperse in the presence of a target analyte, thereby altering the measured NMR properties of the liquid sample. The device may be used, for example, as a portable unit for point of care diagnosis and/or field use, or the device may be implanted for continuous or intermittent monitoring of one or more biological species of interest in a patient.05-28-2009
20110089948MAGNETIC RESONANCE IMAGING APPARATUS - An MRI apparatus includes an imaging means being provided with a means for generating magnetic fields respectively of a static magnetic field, a gradient magnetic field, and an RF magnetic field, and a means for receiving an echo signal generated from a subject, the imaging means being for measuring echo data associated with at least one measurement trajectory in k-space, while varying angles with respect to a coordinate axis in the k-space of the measurement trajectory, so as to collect at least one measured data for each of the angles; and an image reconstruction means for rearranging the measured data in the k-space and reconstructing an image; wherein, the image reconstruction means calculates a phase for correction based on standard data selected from the measured data for each of the angles, prior to rearranging the measured data in the k-space, and performs a phase correction as to the measured data, by using the phase for correction being calculated. With the procedure above, it is possible to reduce an artifact caused by the nonlinearity of the gradient magnetic field and/or inhomogeneities of the magnetic field, without extending the imaging time.04-21-2011
20110089947APPARATUS AND METHOD FOR DECREASING BIO-EFFECTS OF MAGNETIC GRADIENT FIELD GRADIENTS - A magnetic field generator includes a power source and a segmented or un-segmented coil connected to the power source to generate a time-varying magnetic field. Energy is applied to the coil so that the coil generates a time-varying magnetic field gradient with a magnitude of at least 1 milliTesla per meter and a rise-time of less than 10 microseconds. The coil may be comprised of overlapping, non-overlapping or partially overlapping coil segments that may individually energized to further improve the operating characteristics of the coil to further decrease bio-effects in magnetic resonance imaging through the use of reduced pulse lengths and multi-phasic magnetic gradient pulses.04-21-2011
20110089946THROUGH-TIME NON-CARTESIAN GRAPPA CALIBRATION - Example systems and methods control a parallel magnetic resonance imaging (pMRI) apparatus to acquire non-Cartesian (e.g., spiral) calibration data sets throughout time. Example systems and methods also control the pMRI apparatus to acquire an under-sampled non-Cartesian data set from the object to be imaged. Example systems and methods then control the pMRI apparatus to reconstruct an image of the object to be imaged from the under-sampled non-Cartesian data set. The reconstruction depends, at least in part, on a through-time non-Cartesian GRAPPA calibration where a value for a point missing from k-space in the under-sampled non-Cartesian data set is computed using a GRAPPA weight set calibrated and applied for the missing point. The GRAPPA weight set is computed from data in the non-Cartesian calibration data sets.04-21-2011
20110089945Targeted acquisition using holistic ordering (TACHO) approach for high signal to noise imaging - An MRI includes imaging coils. The MRI includes receiving coils. The MRI includes a controller in communication with the imaging coils and the receiving coils which controls the imaging coils and the receiving coils to sample k space associated with a patient in a pattern based on prior knowledge of k space data, and which reconstructs an image of the patient from the sampled k space. A method of an MRI includes the steps of acquiring preliminary k space data of a patient indicating the extent of k space data for all receiver channels using imaging and receiving coils. There is the step of determining with a controller which regions of signal associated with the k space are to be targeted by multiple acquisition blades of data with the imaging and receiver coils based on the preliminary k space. There is the step of sampling each of the regions determined by the controller with the blades to obtain k space data. There is the step of storing the k space data in a memory. There is the step of interpolating the k space data to fit in a regular rectangular grid and fitting each separate blade of k space data to the grid with the controller. There is the step of averaging overlapping k space data with the controller. There is the step of reconstructing an image from the k space data. A computer program.04-21-2011
20120161762LONG RANGE DETECTION OF EXPLOSIVES OR CONTRABAND USING NUCLEAR QUADRUPOLE RESONANCE - Nuclear quadrupole resonance substance detection at a distance is provided by crossed or overlapping high frequency beams in which the frequency of one of the beams is offset with respect to the frequency of the other beam by an amount equal to the resonant frequency of the non-linear material to be detected. The presence of energy at the offset frequency within the overlapping beams pumps any non-linear material within the overlapping beams to cause stimulated emission which is detected, in one embodiment, utilizing a network analyzer, along with correlation of the detected stimulated emission signature with a library of signatures for predetermined substances.06-28-2012
20120212222SYSTEM AND METHOD FOR ENHANCED CONTRAST MR IMAGING - A system and method for enhanced contrast MR imaging include a computer programmed to perform a first scan of an imaging object based on a first fast spin echo (FSE) scan sequence comprising a first series of RF pulses having a first flip angle sequence to acquire a first MR data set and perform a second scan of the imaging object based on a second FSE scan sequence comprising a second series of RF pulses having a second flip angle sequence, wherein the second flip angle sequence is different from the first flip angle sequence to acquire a second MR data set. The computer is further programmed to generate a difference image based on the first and second MR data sets.08-23-2012
20120119739ARRANGEMENT AND METHOD FOR INFLUENCING AND/OR DETECTING MAGNETIC PARTICLES AND FOR MAGNETIC RESONANCE IMAGING - Magnetic particle imaging allows the imaging of fast tracer dynamics, but there is no native tissue contrast. A combination with MRI solves this issue. However, coil geometries in MPI and MRI differ significantly, making direct use impractical. According to one aspect of the present invention it is proposed to use pre-polarized MRI to overcome these difficulties. Further, methods and arrangements are proposed to achieve MRI imaging with minimal additional hardware.05-17-2012
20120249136METHOD AND APPARATUS FOR PERFORMING DIFFUSION SPECTRUM IMAGING - A method of generating a magnetic resonance (MR) image of a tissue includes acquiring MR signals at undersampled q-space encoding locations for a plurality of q-space locations that is less than an entirety of the q-space locations sampled at the Nyquist rate, wherein the acquired signal at the q-space locations represents the three-dimensional displacement distribution of the spins in the imaging voxel, synthesizing the MR signal for the entirety of q-space encodings using a compressed sensing technique for a portion of q-space locations at which MR data was not acquired, combining the acquired MR signals at q-space encodings and the synthesized MR signals at q-space encodings to generate a set of MR signals at q-space encodings that are evenly distributed in q-space, using the set of MR signals at q-space encodings to generate a function that represents a displacement probability distribution function of the set of spins in the imaging voxel, and generating an image of the tissue based on at least a portion of the generated function. A system and computer readable medium are also described herein.10-04-2012
20120249138MAGNETIC RESONANCE METHOD AND SYSTEM TO CORRECT PHASE INFORMATION IN MR IMAGES - In a magnetic resonance (MR) method and system for correction of phase information in MR images of a predetermined volume segment of an examination subject, a basic magnetic field is applied and MR data of the predetermined volume segment are acquired and evaluated such that phase information is calculated for each image element of the predetermined volume segment. A navigator signal is acquired that detects an unintentional change of the basic magnetic field that is caused by movements of the examination subject or by the magnetic resonance system itself. The phase information is corrected with this navigator signal.10-04-2012
20120249137Method of dynamically compensating for magnetic field heterogeneity in magnetic resonance imaging - A method to compensate for the magnetic field heterogeneity inside an object of investigation in a MR device obtains an uncorrected magnetic field distribution of the object and executes an MR sequence with a desired k-space coverage by applying RF pulses to generate a transverse magnetization within the object. MR signal data is recorded, magnetic field shimming parameters are dynamically updated and MR signal data are reconstructed to produce images or localized spectroscopic data. Artifacts in a reconstructed image resulting from an uncorrected magnetic field distribution are suppressed by temporally separating MR signals originating from at least two different sub-volumes within a volume of transverse magnetization by generating a nonlinear phase distribution within the object and by dynamically updating shimming parameters to compensate for the field inhomogeneity distributions within the different sub-volumes in the volume of transverse magnetization.10-04-2012
20100289493METHOD AND DEVICE TO CONTROL A WORKFLOW OF AN MR MEASUREMENT IN A MAGNETIC RESONANCE SYSTEM - In a method and a device to control a workflow of an MR measurement in a magnetic resonance system, MR signals from multiple slices of a predetermined volume segment of an examination subject are acquired, multiple slices with a continuous table feed. In the MR measurement, one of these multiple slices in the active volume of the magnetic resonance system is repeatedly measured in succession at different measurement positions P11-18-2010
20100244825System And Method Of Parallel Imaging With Calibration To A Virtual Coil - A method for generating a magnetic resonance (MR) image includes acquiring calibration data from each of a plurality of RF source coils. Calibration data for a virtual coil is generated based on the calibration data from the plurality of RF source coils and a set of synthesis weights is generated based on the calibration data from the plurality of RF source coils and the calibration data for the virtual coil. Accelerated MR data is acquired from each of the plurality of RF source coils. An image can be reconstructed based on an application of the set of synthesis weights to the accelerated MR data from the plurality of RF source coils.09-30-2010
20100244831DYNAMIC MAGNETIC RESONANCE IMAGING (MRI) WITH ADAPTIVE IMAGE QUALITY - A resonance imaging (MRI) apparatus (09-30-2010
20100244830MAGNETIC RESONANCE METHOD AND DEVICE TO DIFFERENTIATE AMONG PIXELS REPRESENTING A SILICON-DOMINATED SUBSTANCE, WATER-DOMINATED TISSUE AND FAT-DOMINATED TISSUE - In a magnetic resonance method and device for automatic differentiation of respective pixels as representing either a silicon-dominated substance, or fat-dominated tissue, or water-dominated tissue, a first magnetic resonance signal and a second magnetic resonance signal are acquired per pixel, wherein the first magnetic resonance signal per pixel is acquired at a point in time at which the phase of a magnetic resonance signal originating from water-containing tissue exhibits a phase opposite to the phase of a magnetic resonance signal originating from fat-containing tissue, and the second magnetic resonance signal is acquired per pixel at a point in time at which the phase of the magnetic resonance signal originating from water-containing tissue exhibits a phase identical to the phase of the magnetic resonance signal originating from fat-containing tissue, and the phase of a magnetic resonance signal originating from a silicon-containing substance exhibits a phase opposite to the phase of the magnetic resonance signal originating from water-containing or fat-containing tissue. A first intermediate result is determined that indicates whether the pixel represents water-dominated tissue or fat-dominated tissue on the basis of first magnetic resonance signals. A second intermediate result is determined that indicates whether the pixel represents the silicon-dominated substance on the basis of second magnetic resonance signals. The pixel is designated as representing water-dominated tissue, fat-dominated tissue or the silicon-dominated substance on the basis of the first intermediate result and the second intermediate result.09-30-2010
20100244832MAGNETIC RESONANCE APPARATUS AND METHOD FOR IMPLEMENTING A NEUROLOGICAL SEQUENCE PROTOCOL - In a method and apparatus to generate MR images of an examination region containing tissue with a first T2 time and tissue with a second, significantly longer T2 time are contained, as series of pulse sequences is employed the following pulse sequences: an overview pulse sequence to generate MR overview images, a T1-weighted pulse sequence to generate T1-weighted MR images and a multiple contrast pulse sequence in which at least two groups of magnetic resonance signals are acquired. A first group of magnetic resonance signals is acquired after excitation of a magnetization in a first time period and at least one second group of magnetic resonance signals is acquired in a second time period after the first time period in which the tissue with the significantly longer T2 time delivers the significant signal contribution. An MR image is calculated based on a pixel-by-pixel difference of the absolute values from the magnetic resonance signals of the first group and the second group.09-30-2010
20100244829MAGNETIC RESONANCE PROJECTION ANGIOGRAPHY WITH CONTINUOUS TABLE DISPLACEMENT - In a method and apparatus for contiguous large imaging in magnetic resonance tomography given continuous table displacement and per-segment, para-sagittal and/or para-coronal FOV relative to the table displacement direction, a sagittal and/or coronal magnetic resonance tomography overview image is/are acquired with table displacement direction in the longitudinal direction of the body and planning FOV by circumscribing the anatomical region of interest depicted in the respective overview image, for example a vessel tree. The arrangement of 2D or 3D RF excitation volumes to be radiated is planned such that the planning FOV is completely overlapped sagitally and/or coronally by the entirety of the RF excitation volume. A segment-by-segment magnetic resonance tomographical measurement of the entire 2D or 3D region defined by the RF excitation volume ensues on the basis of temporally following, slice-selective radio-frequency excitation pulses during continuous table displacement. At least two of the 2D or 3D RF excitation volumes are shifted para-sagitally and/or para-coronally against one another, with the focal point of an RF excitation volume being on the center line of the planning FOV.09-30-2010
20100244824APPARATUS FOR SUPPORTING AND METHOD FOR FORMING A SUPPORT FOR A MAGNETIC RESONANCE IMAGING (MRI) MAGNET - An apparatus and method for supporting a magnetic resonance imaging magnet are provided. The apparatus includes a magnet coil support structure having a main former body with a plurality of channels and an end flange at each end of the main former body. The end flanges are reinforced with a strengthening material at least at corner regions of the end flanges.09-30-2010
20100244828ADJUSTABLE PERMANENT MAGNET ASSEMBLY FOR NMR AND MRI - System and methods for designing and using single-sided magnet assemblies for magnetic resonance imaging (MRI) are disclosed. The single-sided magnet assemblies can include an array of permanent magnets disposed at selected positions. At least one of the permanent magnets can be configured to rotate about an axis of rotation in the range of at least +/−10 degrees and can include a magnetization having a vector component perpendicular to the axis of rotation. The single-sided magnet assemblies can further include a magnet frame that is configured to hold the permanent magnets in place while allowing the at least one of the permanent magnets to rotate about the axis of rotation.09-30-2010
20100244833MAGNETIC RESONANCE IMAGING APPARATUS - In an MRI apparatus, a detecting unit that includes a thermographic imaging equipment and a normal imaging camera detects a change in temperature of an imaging space from outside of the imaging space. A judging unit judges whether the imaging space has a point at a temperature greater than a threshold TH, and if the judging unit judges the imaging space has such a point with a temperature greater than the threshold, the apparatus stops the sequence that applies a gradient magnetic field to the subject.09-30-2010
20120161763HF ATTENUATION - The present embodiments relate to a device and a method for attenuating a high-frequency field of a magnetic resonance tomography system, where at least one attenuation element attenuating high-frequency fields is provided outside a magnetic resonance tomography field of view.06-28-2012
20120126812MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - First magnetic resonance imaging (MRI) three-dimensional heart image data includes a plurality of two-dimensional heart image data superimposed and having a resolution in at least one direction that is different from that in two other directions. A first axis is detected in the three-dimensional heart image data. A first vector is calculated as passing through the first axis and having at least a predetermined resolution and generated image data on a plane passing through the first axis and the first vector is generated from the first imaging data. A second axis is detected relating to the heart from the generated image data, the second axis being a higher precision axis than the first axis.05-24-2012
20120126813METHOD AND MAGNETIC RESONANCE SYSTEM TO ACQUIRE MR DATA IN A PREDEFINED THREE-DIMENSIONAL VOLUME SEGMENT - In a method and magnetic resonance (MR) apparatus to acquire MR data in a predetermined three-dimensional volume segment of an examination subject, the three-dimensional volume segment is selectively excited with an RF excitation pulse, wherein a magnetic field gradient at the same time is switched. Two phase coding gradients and an additional magnetic field gradient are switched for spatial coding and MR data are acquired depending on this. A frequency range of the RF excitation pulse is set depending on resonance frequencies of at least two substances to be acquired within the volume segment, such that a center frequency of the frequency range is caused to be located between the resonance frequencies.05-24-2012
20100225318MAGNETIC RESONANCE SYSTEM AND METHOD FOR SPATIALLY RESOLVED DETECTION OF MOVEMENT PROCESSES - A method for spatially resolved detection and display of movement processes in an examination subject by means of magnetic resonance tomography includes the steps of imposing a magnetization pattern on at least a portion of a fluid medium located in the intestine of the examination subject, acquiring at least one image data set or a portion of an image data set that images the region of the examination subject on which the magnetization pattern was imposed, determining at least one item of movement information from the at least one image data set or portion of an image data set, by an analysis of the magnetization pattern in a processor, and presenting the at least one item of movement information through presentation device in communication with the processor.09-09-2010
20120161765MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging apparatus configured to carry out a pulse sequence in synchronization with a biosignal is provided. The pulse sequence includes an RF pulse, and a data acquisition sequence for acquiring data when a wait time has passed after the RF pulse, wherein the wait time has a variable value that can be varied based on the biosignal.06-28-2012
20120161764METHOD AND DEVICE TO DETERMINE A MAGNETIC RESONANCE SYSTEM ACTIVATION SEQUENCE - In a method and a control sequence determination device and a magnetic resonance system for the determination of a magnetic resonance system activation sequence as a multichannel pulse train with multiple individual RF pulse trains to be emitted in parallel by the magnetic resonance system respectively via multiple independent radio-frequency transmission channels of a transmission device, the multichannel pulse train is calculated in order to achieve a defined local target magnetization distribution upon emission of the calculated multichannel pulse train. The local target magnetization distribution is obtained as a parameter map determined from image data obtained with preceding measurement.06-28-2012
20100207629Method For Image Reconstruction From Undersampled Medical Imaging Data - A method for image reconstruction that utilizes a generalization of compressed sensing is provided. More particularly, a method for homotopic l08-19-2010
20110181285METHOD AND APPARATUS FOR MAGNETIC RESONANCE IMAGING TO CREATE T1 MAPS - In a method and apparatus for MR imaging, a data acquisition sequence is executed wherein at least two slices of an examination subject are imaged in parallel with a gradient echo method for spatially resolved quantification of the T07-28-2011
20110181286MAGNETIC RESONANCE IMAGING APPARATUS, AND BREATH-HOLDING IMAGING METHOD - In order to make it possible to set the optimal breath-holding imaging conditions according to the subject without extension of an imaging time or the sacrifice of image quality, one scan is divided into one or more breath-holding measurements and free-breathing measurements on the basis of the imaging conditions of a breath-holding measurement, which are input and set according to the subject, and a region of the k space measured in the breath-holding measurement is controlled. Preferably, in the breath-holding measurement, low-frequency data of the k space is measured. Moreover, preferably, imaging conditions of the breath-holding measurement include the number of times of breath holding or a breath-holding time, and the operator can set any of these values.07-28-2011
20110181284MAGNETIC FIELD GRADIENT MONITOR APPARATUS AND METHOD - A method based on pure phase encode FIDs that permits high strength gradient measurement is disclosed. A small doped water phantom (1˜3 mm droplet, T07-28-2011
20110181283System for Concurrent Acquisition of MR Anatomical Brain Images and MR Angiograms Without Contrast-Injection - An MR imaging system without the use of a contrast agent, in a first repetition time interval, generates a non-selective magnetization preparation pulse for magnetizing an anatomical volume encompassing blood flowing into a selected slab within the volume for blood signal suppression, generates RF excitation pulses and acquires a first MR imaging dataset of the selected slab within the volume with a suppressed blood signal. The system in a second repetition time interval succeeding the first repetition time interval, generates a selected slab magnetization preparation pulse for magnetizing the selected slab, generates RF excitation pulses and acquires a second MR imaging dataset of the selected slab within the volume. An image data processor substantially subtracts imaging data of the first MR imaging dataset from the second MR imaging dataset to provide an image enhancing a vessel structure in the selected slab and also substantially averages imaging data to provide an MR anatomical image.07-28-2011
20110181282Method and apparatus for designing and/or implementing variable flip angle MRI spin echo train - A variable flip angle (VFA) MRI (magnetic resonance imaging) spin echo train is designed and/or implemented. For example, a target train of detectable spin-locked NMR (nuclear magnetic resonance) echo signal amplitudes may be defined and a corresponding designed sequence of variable amplitude (i.e., variable NMR nutation angle) RF refocusing pulses may be determined for generating that target train of spin echoes in an MRI sequence (e.g., used for acquiring MRI data for a diagnostic imaging scan or the like). Such a designed VFA sequence may be output for study and/or use by an MRI system sequence controller.07-28-2011
20120212223MAGNETIC RESONANCE IMAGING APPARATUS AND TWO-DIMENSIONAL EXCITATION ADJUSTMENT METHOD - An MRI apparatus and a two-dimensional excitation adjustment method capable of performing appropriately two-dimensional excitation of a region, in which materials with different resonance frequencies are present, according to imaging conditions are provided. In order to do so, when performing the two-dimensional excitation of a two-dimensional excitation region of an object formed by a first material with a first resonance frequency and a second material with a second resonance frequency, an irradiation frequency of a high-frequency magnetic field for the two-dimensional excitation is set on the basis of the imaging conditions related to the two-dimensional excitation and the first and second resonance frequencies so that desired regions of the first and second materials are excited in a two-dimensional manner.08-23-2012
20120161766CONCURRENT OPTIMIZATION OF RF POWER AND RF FIELD UNIFORMITY IN MRI - A magnetic resonance method comprising: loading a subject into a magnetic resonance scanner; with the subject loaded into the magnetic resonance scanner, acquiring B1 maps (06-28-2012
20120133360MAGNETIC RESONANCE DIAGNOSIS APPARATUS AND DATA ACQUISITION METHOD OF MAGNETIC RESONANCE SPECTROSCOPY - In one embodiment, a magnetic resonance diagnosis apparatus includes an application region calculation unit and a data generation unit. The application region calculation unit automatically calculates an application region of a prepulse based on “image data including a region of interest of an object generated by magnetic resonance imaging before application of a prepulse”. The data generation unit applies the prepulse according to the application region automatically calculated by the application region calculation unit, then receives a magnetic resonance signal from a data acquisition region including the region of interest, and generates magnetic resonance spectrum data indicative of concentration distribution per metabolic substance in the region of interest based on the magnetic resonance signal.05-31-2012
20120133363MAGNETIC RESONANCE COMPATIBLE AND SUSCEPTIBILITY-MATCHED APPARATUS AND METHOD FOR MR IMAGING & SPECTROSCOPY - Electrodes, infusion cannula, and interventional MRI instrumentation, are constructed with multiple layers or mixtures of metals or alloys that allow the diamagnetic behavior of some metals to combine with the paramagnetic behavior of others, wherein the devices have a magnetic susceptibility which is close to that of the material, for example body tissue, being im The material may thereby be imaged using MRI with resultant images having greatly reduced distortion. Optimal metal composites are determined through mathematical modeling and measurements. In particular, MR compatible susceptibility-matched electrodes may be used for stimulation and for acquiring electroencephalography (EEG) data before, during and after MR image and spectroscopy measurements, with a significant reduction in distortion of the resulting images and spectra. In accordance with the invention, these electrodes may further be incorporated into micro-electrode arrays. In addition, MR compatible susceptibility-matched cannula can implanted before, during and after MR image and spectroscopy measurements, with a significant reduction in distortion of the resulting images and spectra.05-31-2012
20120133361SUPPLEMENTATION OF ACQUIRED, UNDERSAMPLED MR DATA - In a computerized method and magnetic resonance (MR) system for the supplementation of acquired MR data, at least one supplemented MR data set is determined from multiple acquired, reduced MR data sets that can be acquired with an accelerated acquisition method (such as partially parallel acquisition method, ppa) in which k-space is undersampled. The acquisition can thereby take place in parallel with multiple acquisition coils. In the method and system, a reconstruction kernel is applied to the multiple acquired, reduced MR data sets in order to determine a reconstructed MR data set for an acquisition coil. The reduced MR data set acquired with the acquisition coil is reused in this reconstructed MR data set. The reuse takes place by a combination with weighting with the respective variances.05-31-2012
20120249141METHOD FOR CORRECTING A DISTORTION IN A MAGNETIC RESONANCE RECORDING - A method is disclosed for correcting a distortion in a magnetic resonance recording. A distortion indicates a mismatch between a distorted position of an image point in the magnetic resonance recording and an actual position of the image point. According to at least one embodiment of the method, a B10-04-2012
20090058419MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGE DISPLAYING METHOD - A magnetic resonance imaging apparatus includes a scan section which executes a diffusion weighted imaging pulse sequence on an imaging area of a subject within a static magnetic field space thereby to acquire magnetic resonance signals, an image generating part which generates an image with respect to the imaging area, based on the magnetic resonance signals acquired by the scan section, a display unit which displays the image generated by the image generating part on a display screen thereof, and a window setting part which sets a window level and a window width at the time that the display unit displays the image, based on diffusion parameters calculated from the magnetic resonance signals acquired by the scan section. The display unit displays the image on the display screen by the window level and the window width both set by the window setting part.03-05-2009
20090058418DOUBLE HALF RF PULSES FOR REDUCED SENSITIVITY TO EDDY CURRENTS IN UTE IMAGING - A method for creating a magnetic resonance image of an object with at least a first species and a second species, wherein the first species has a first T03-05-2009
20120313640METHOD AND MAGNETIC RESONANCE SYSTEM FOR DISTORTION CORRECTION IN MAGNETIC RESONANCE IMAGING - In a method for distortion correction in spiral magnetic resonance imaging, a first MR data set is acquired by scanning raw data space along a spiral trajectory beginning at a first point. A first complex MR image is determined from the first MR data set, which includes first phase information for image points of the first MR image. A second MR data set is acquired by scanning raw data space along the spiral trajectory beginning at a second point that differs from the first point. A second complex MR image is determined from the second MR data set, which includes second phase information for image points of the second MR image. A geometric distortion for image points of the first or second MR image is determined from the first and second phase information, for example with a PLACE method.12-13-2012
20120169340MR IMAGING SYSTEM WITH FREELY ACCESSIBLE EXAMINATION VOLUME - The invention relates to a magnetic resonance imaging system (07-05-2012
20120169337METHOD AND APPARATUS FOR MAKING DISTINCTION IN A MAGNETIC RESONANCE IMAGING WATER-FAT IMAGE - In a method and an apparatus for making a distinction in a magnetic resonance imaging water-fat image, three echoes are acquired without phase encoding as a reference scan, a reference water-fat image projection is calculated in the phase encoding direction using the reference scan, a complete water-fat image projection is calculated in the phase encoding direction according to a water image and a fat image obtained by a three-point Dixon method, a correlation between the reference water-fat image projection and the complete water-fat image projection is calculated to obtain at least two correlated values, and the maximum correlated value is acquired therefrom, so as to determine the type of said image calculated by using the three-point Dixon method.07-05-2012
20120249143MAGNETIC RESONANCE IMAGING APPARATUS - In a magnetic resonance imaging apparatus according to one embodiment, an executing unit executes a first pre-scan and a second pre-scan, each being a pre-scan in which readout gradient magnetic fields and slice direction gradient magnetic fields are applied in an identical manner to a pulse sequence for main-scanning and in which phase encode gradient magnetic fields are applied in an identical manner to the pulse sequence for main-scanning up to just before echoes used in calculating a correction amount, and each having different predetermined imaging parameters; a calculating unit calculates, as a correction amount, an amount of phase shifting by referring to phase differences present in a plurality of echo signals that are collected during the first pre-scan and the second pre-scan; and a correcting unit corrects the pulse sequence for main-scanning based on the correction amount calculated by the calculating unit.10-04-2012
20100052676MAGNETIC RESONANCE IMAGING APPARATUS AND SCANNING-CONDITION SETTING METHOD - A Signal-to-Noise (SN) ratio maintained scanning-condition recalculating unit re-sets a value of a scanning parameter other than an SN ratio included in scanning conditions when the size of a Field Of View (FOV) to be set for a scan is changed, so as to make the SN ratio of an image to be taken under after-change scanning conditions equal to or larger than the SN ratio of an image assumed to be taken under before-change scanning conditions. A scanning-condition edit/scan positioning unit then sets scanning conditions based on the value of the scanning parameter recalculated by the scanning-condition recalculating unit.03-04-2010
20100052681SYSTEM AND METHOD OF ANGULAR ELLIPTIC CENTRIC VIEW ORDERING FOR 3D MR ACQUISITIONS - A method of magnetic resonance (MR) imaging includes segmenting a k03-04-2010
20100052680METHOD FOR OPERATING MAGNETIC RESONANCE SYSTEM - In a method for operation of a magnetic resonance system, at least one control device is fashioned for image data acquisition and corresponding components, and only three first control parameters defining primary boundary conditions are selected by an operator of the system, namely the contrast response, the spatial orientation of the at least one image data set to be acquired and the examination organ. Additional, second control parameters, required to control the components for image acquisition and defining secondary boundary conditions, are automatically determined by the control device using the first control parameters.03-04-2010
20100052679Coil Array Mode Compression For Parallel Transmission Magnetic Resonance Imaging - A method for target-dependent, sparsity-enforced selection for choosing a substantially optimal connection of radiofrequency (“RF”) transmitters to the elements of the RF coil array is provided. In particular, a method is provided that selects the linear combinations of the “N” spatial mode profiles of a transmission RF coil array, such that the k-space trajectory and pulse duration acceleration capabilities of the array are advantageously utilized. A sparsity-enforcement method that determines a subset of the available spatial modes for a parallel transmission RF coil array is employed to this end. In this manner, the utilization of the encoding power of a highly-parallel N-mode coil array in a system with only “P” available excitation channels is enabled.03-04-2010
20100052677MAGNETIC RESONANCE IMAGING SYSTEM AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging system is provided which includes detection means for detecting a magnetic resonance signal generated from a sample, acquisition means for repeatedly acquiring data on the magnetic resonance signal detected by the detection means in an imaging period and arranging the acquired data in a k space, wherein the acquisition means acquires the data in one acquisition pattern of a plurality of different acquisition patterns, which are determined so that an acquisition frequency of data in some areas of the k space is different from that in the other areas of the k space, reconstruction means for repeatedly reconstructing an image of the sample on the basis of the data acquired by the acquisition means and arranged in the k space, and control means for controlling the acquisition means to change the acquisition pattern used by the acquisition means during the imaging period.03-04-2010
20100052674Method for determining an attenuation map for use in positron emission tomography and for the use of homogeneity information relating to the magnetic resonance magnetic field - A method is disclosed for determining an attenuation map for use in positron emission tomography and for the use of homogeneity information relating to the magnetic resonance magnetic field, in particular for the purpose of determining shim settings, within the scope of a single magnetic resonance image recording. In at least one embodiment of the method, a first and a second image data record are firstly recorded with a three-dimensional gradient echo sequence during a first and a second echo time, respectively, with the phase difference between the water and the fat signal amounting to zero during the first echo time and amounting to 180 degrees during the second echo time. The attenuation map is determined from fat/water ratios obtained from the image data records by way of a Dixon technology, in particular a 2-point Dixon technology. In at least one embodiment, all voxels with a signal intensity below a first threshold value are excluded at least for the second image data record by using a mask and only the non excluded voxels of the first and second image data record are taken into consideration in order to determine the homogeneity information from the phase differences of adjacent voxels.03-04-2010
20100066360MAGNETIC RESONANCE IMAGING METHOD USING A PARALLEL IMAGING TECHNIQUE COMBINED WITH A ZOOMED ACQUISITION TECHNIQUE - In a magnetic resonance imaging method and apparatus, magnetic resonance data are acquired (an examination subject) using a zoomed method, and reconstruction of the image of the examination subject is undertaken using a parallel imaging reconstruction method.03-18-2010
20120176132MAGNETIC RESONANCE IMAGING APPARATUS AND IRRADIATION FREQUENCY ADJUSTING METHOD - A high-quality image is obtained using a two-dimensional selective excitation method even if the static magnetic field is not uniform. Therefore, non-uniformity of a static magnetic field of a region to be focused in particular in a selective excitation region excited by 2DRF is measured, and a result of the measurement is reflected in an imaging sequence using the 2DRF. For example, a resonance frequency of magnetization obtained from the measurement result is set as an irradiation frequency of the 2DRF. In addition, a shim gradient magnetic field is applied so as to correct the non-uniformity of the magnetization obtained from the measurement result. These are applied only in the imaging sequence using the 2DRF, and an irradiation frequency and a shim gradient magnetic field set in a conventional method are used in other imaging sequences.07-12-2012
20120074939MAGNETIC RESONANCE METHOD AND SYSTEM TO GENERATE AN OPTIMIZED MR IMAGE OF AN EXAMINATION SUBJECT - A magnetic resonance method and system for generation of an optimized MR image of an examination subject operate as follows. A pulse sequence including a series of at least two RF pulses is radiated into the examination subject to generate at least one optimized signal, wherein the second and possibly every additional RF pulse is radiated before the effect of the first or a preceding RF pulse on the spin system in the examination subject has decayed. The radiated RF pulses are generated by parallel transmission coils. At least the signal resulting after the last radiated RF pulse of the pulse sequence is acquired. The pulse sequence is repeated with modified spatial coding until signals have been generated and acquired in a desired positional space. The optimized MR image per pulse sequence is calculated from at least one of the acquired signals.03-29-2012
20120074938MAGNETIC RESONANCE METHOD AND SYSTEM TO GENERATE AN IMAGE DATA SET - In a magnetic resonance system and method the imaging area is readout by: (a) switching at least two phase coding gradients in respective spatial directions, (b) at the full strength of the phase coding gradients, radiating a non-slice-selective RF excitation pulse, (c) after a time t03-29-2012
20120074937Increasing spoil efficiency - A method for operating a nuclear magnetic resonance imaging device, wherein a continuous sequence of radio-frequency (=RF) pulses are radiated onto a sample, Ψ being the constant phase value for all magnetization vectors, and all magnetization vectors undergo a phase progression F03-29-2012
20100271023METHOD FOR IMAGING IN MAGNETIC RESONANCE TOMOGRAPHY WITH SPECTRAL FAT SATURATION OR SPECTRAL WATER EXCITATION - A magnetic resonance tomography (MRT) method with spectral fat saturation or spectral water excitation in a tissue region that is to be represented of a patient who is to be examined, includes the following steps: (Step 1) frequency adjustment measurement of a region of a patient that is to be represented with a selected first partial coil of the MRT system, (Step 2) precise determination of the resonance frequency of water with the aid of the spectrum obtained in Step 1 exhibiting the resonance frequencies of fat and water, (Step 3) repetition of Steps 1 and 2 with at least one additionally selected second partial coil of the MRT system adjacent to the first partial coil, (Step 4) measuring of a k space data record with a partial coil or a partial coil combination on the basis of the water resonance frequency assigned to these partial coils, (Step 5) repetition of Step 4 with other partial coils or other partial coil combinations until the entire tissue region to be represented has been measured, (Step 6) combining of the measuring results obtained in Steps 4 and 5, and (Step 7) representing of the results obtained in Step 6 in the image space in the form of an overall image of the tissue region to be represented.10-28-2010
20100271021METHOD AND APPARATUS FOR DIFFUSION TENSOR MAGNETIC RESONANCE IMAGING - An apparatus and method for obtaining diffusion weighted magnetic resonance images (DW-MRI) is described. The properties of the diffusion tensor in tissue are measured by applying a diffusion weighting gradient oriented along a plurality of measurement axes. The value of the magnetic field is increased by using as many of the magnetic gradient coils as are effective in contributing the gradient field strength along the axis being. In regions where the magnetic field gradient is increased, the echo time (TE) may be decreased, increasing the signal-to-noise ratio of the measurements. Alternatively, the number of measurements than are averaged to achieve a particular image quality may be decreased, reducing the patient exposure time.10-28-2010
20100271020Steady-state-free-precession (SSFP) magnetic resonance imaging (MRI) and method - An MRI includes imaging coils. The MRI includes receiving coils. The MRI includes a controller causing the imaging coils to produce RF pulses at every repetition time so different parts of a patient are receiving excitation by RF pulses at different rates and k space data are acquired at each repetition time by the receiving coils to form images of the patient with the k space data. A method for an MRI includes the steps of causing with a controller imaging coils to produce RF pulses at every repetition time so different parts of a patient are receiving excitation by RF pulses at different rates. There is the step of acquiring k space data at each repetition time by receiving coils. There is the step of forming images of the patient with the k space data using approaches such as Fourier transformation or filtered back projection.10-28-2010
20120313641METHOD AND DEVICE FOR MAGNETIC RESONANCE SPECTROSCOPIC IMAGING - A method of magnetic resonance spectroscopic imaging of an object (O) including at least one chemical species to be imaged, comprising sampling of the k-space such that a plurality of N12-13-2012
20120256628MAGNETIC RESONANCE IMAGING USING RANDOMIZED RADIO FREQUENCY PULSES - Methods, systems and apparatus for magnetic resonance imaging that facilitate applying a gradient waveform to generate a k-space trajectory in a subject, applying radio frequency (RF) pulses having a pseudorandom phase distribution, such that the RF pulses are applied to the subject at a plurality of non-uniform locations near a center of the k-space trajectory and collecting, based on the applied RF pulses and the applied gradient waveform, imaging data from the subject.10-11-2012
20120256625Method for Accelerated High Resolution Chemical Species Separation for Magnetic Resonance Imaging - A method for producing an image of a subject with a magnetic resonance imaging (MRI) system is provided. Image data is acquired at a sequence of multiple echo times occurring within two or more repetition times (TRs). Odd-numbered echoes are sampled during odd-numbered TRs, and even-numbered echoes are sampled during even-numbered TRs. Images are reconstructed and used to calculate the respective signal contributions of two or more chemical species using, for example, an IDEAL separation technique. The respective signal contributions are then used to produce images that depicts substantially only one of the chemical species. For example, separated water and fat images may be produced.10-11-2012
20090027052Method for acquiring measured data - A PET examination which acquires a data record of the body of a patient is carried out during at least one embodiment of a method for acquiring measured data. On the basis of the measured values of the data record, at least one region of interest in the body of the patient is determined, in which at least one examination of at least one embodiment of a method is carried out.01-29-2009
20090027051Method for magnetic resonance imaging using inversion recovery with on-resonant water suppression including mri systems and software embodying same - Featured are methods for magnetic resonance imaging of a volume, such a volume having susceptibility-generating objects or interfaces having susceptibility mismatches therein. Such a method includes selectively visualizing one of susceptibility-generating objects or interfaces having susceptibility mismatches as hyperintense signals, where such visualizing includes controlling variable imaging parameters so as to control a geometric extent of a signal enhancing effect, m more particular aspects of the present invention, such selectively visualizing includes attenuating or essentially suppressing signals from fat and/or water, namely on-resonant water protons, so as to thereby enhance a signal(s) associated with magnetic susceptibility gradient(s). Also featured are MRI systems, apparatuses and/or applications programs for execution on a computer system controlling the MRI data acquisition process embodying such methods.01-29-2009
20110115484ULTRA FAST MAGNETIC RESONANCE IMAGING METHOD AND APPARATUS FOR NON-CONTRAST AGENT MR ANGIOGRAPHY USING ELECTROCARDIOGRAPH OR PULSE TRIGGERED HALF FOURIER TURBO SPIN ECHO-BASED ACQUISITION WITH VARIABLE FLIP ANGLE EVOLUTION AND HIGH RESOLUTION - In a magnetic resonance imaging method for non-contrast imaging of blood at a region in the subject's body, a first 3D MR image is acquired represented by a first 3D volume data set of the region at a first trigger delay time. The first 3D image is acquired using a substantially 90° excitation pulse followed by a plurality of variable flip angle refocus pulses forming an echo train where the refocus pulses are smaller than or equal to 180°. To form the first 3D MR image, multiple MR slices are acquired related to the first trigger delay time to speed up the acquisition of the first image. A second 3D MR image is acquired represented by a second 3D volume data set at the same region using the same steps for acquiring the first 3D MR image except that a second trigger delay time is used which is different than the first trigger delay time. The first 3D volume data set and the second 3D volume data set are subtracted to create a third 3D volume data set. From the third 3D volume data set a 2D substantially maximum intensity projection data set is created which may then be displayed to show the blood at the region.05-19-2011
20100213938SIMULTANEOUS ACQUISITIONS OF SPIN- AND STIMULATED-ECHO PLANAR IMAGING - The disclosure provides echo planar imaging (EPI) based single-shot imaging techniques for acquiring spin-EPI (SEPI) and stimulated-EPI after a single RF excitation. In certain embodiments, the SEPI and STEPI acquired in a singleshot are used to compute a T08-26-2010
20120262167ACCELERATED MULTISPECTRAL DATA MAGNETIC RESONANCE IMAGING SYSTEM AND METHOD - A method for processing magnetic resonance imaging data includes accessing the magnetic resonance imaging data, the data including a plurality of magnetic resonance data sets each collected at different excitation frequencies and defining reconstructable images representative of sections of a single image of a subject. Each magnetic resonance data set includes sampled data for sampled phase encoding points but is missing data for unsampled phase encoding points. The method further includes determining the missing data of at least one of the magnetic resonance data sets using a correlation between the sampled data for the respective magnetic resonance data set and sampled data from at least one other magnetic resonance data set within a spectral window encompassing at least the respective magnetic resonance data set and the at least one other magnetic resonance data set.10-18-2012
20120262170METHOD AND DEVICE FOR DETERMINING A MAGNETIC RESONANCE SYSTEM CONTROL SEQUENCE - A method and a control sequence determination device for determining a magnetic resonance system control sequence is disclosed. The magnetic resonance system control sequence includes a multi-channel pulse with a plurality of individual high-frequency (HF) pulses to be transmitted in parallel by the magnetic resonance system via different independent high-frequency transmission channels. In one embodiment, the method includes calculating a multi-channel pulse based on an MR excitation quality parameter in an HF pulse optimization method. An HF pulse includes a plurality of successive HF partial pulses in discrete time steps. The method further includes considering, in the course of the HF pulse optimization method, a transmission bandwidth of an HF partial pulse to be transmitted during a discrete time step. A method for operating a magnetic resonance system and a magnetic resonance system that includes the control sequence determination device are disclosed.10-18-2012
20120262169SYSTEM AND METHOD FOR DOUBLE INVERSION RECOVERY FOR REDUCTION OF T1 CONTRIBUTION TO FLUID-ATTENUATED INVERSION RECOVERY IMAGING - A system and method for double inversion recovery for reduction of T1 contribution to fluid-attenuated inversion recovery imaging include a computer programmed to prepare a double inversion recovery (DIR) sequence comprising a pair of inversion pulses and an excitation pulse, execute the DIR sequence to acquire MR data from an imaging subject, and reconstruct an image based on the acquired MR data. The preparation of the DIR sequence comprises optimizing a first inversion time (TI10-18-2012
20120262165RELAXOMETRY - Apparatus, methods, and other embodiments associated with multi-scale orthogonal matching pursuit (OMP) for magnetic resonance imaging (MRI) relaxometry are described. One example method includes controlling a nuclear magnetic resonance (NMR) apparatus to cause selected nuclei in an item to resonate by applying radio frequency (RF) energy to the item and then acquiring multiple series of magnetic resonance (MR) images of the item, the series of MR images having different scales. The example method includes controlling the NMR apparatus to produce a combined signal evolution from a first signal evolution associated with a first series of MR images and a second signal evolution associated with a second series of MR images and to characterize relaxation of the selected nuclei in the item as a function of an OMP that compares the combined signal evolution to a set of combined comparative signal evolutions.10-18-2012
20120262168MAGNETIC RESONANCE SYSTEM AND A METHOD FOR EMITTING HIGH-FREQUENCY SIGNALS - A magnetic resonance system having a transmitting system with a high-frequency antenna unit and a high-frequency transmit array. The high-frequency antenna unit is configured to emit high-frequency signals and receive magnetic resonance signals. The high-frequency transmit array has two high-frequency transmit units that allow parallel transmission of high-frequency signals. Each of the high-frequency transmit units of the high-frequency transmit array includes a separate trigger unit.10-18-2012
20120262172MOTION CORRECTION IN ACCELERATED T1-WEIGHTED MAGNETIC RESONANCE IMAGING - A method includes the acts of acquiring a blade of k-space calibration data; acquiring a set of T10-18-2012
20120262174METHOD FOR CALCULATING LOCAL SPECIFIC ENERGY ABSORPTION RATE (SAR) IN NUCLEAR MAGNETIC RESONANCE - A method for calculating a local specific energy absorption rate (SAR) on basis of an electric parameter and the mass density of a segmented geometry of an object and a magnetic field vector distribution of a radio frequency (RF) antenna. The values of the electric parameter and the mass density are pre-determined values, while the magnetic field vector distribution is estimated by a magnetic field mapping method based on a magnetic resonance (MR) scan. The magnetic field mapping method based on a magnetic resonance scan can be a Bi mapping method. The invention also relates to a magnetic resonance system by means of which SAR calculation can be done in a relatively short period of time. The invention also relates to a computer program comprising instructions for calculating a local specific energy absorption rate (SAR) according to the above mentioned method. The SAR calculation used in the above mentioned method, system and program is done in the relatively short period of time and as such is practicable in a clinical setting.10-18-2012
20120262173HIGH-FREQUENCY COIL UNIT AND MAGNETIC RESONANCE IMAGING DEVICE - There is provided a technique for securing a large examination space in a tunnel type MRI device without inviting increase of manufacturing cost and without significantly reducing irradiation efficiency or uniformity of the irradiation intensity distribution in an imaging region. Between rungs of a partially cylindrical RF coil, which coil corresponds to a cylindrical RF coil of which part is removed, there are disposed half-loops generating magnetic fields, which are synthesized with magnetic fields generated by loops constituted by adjacent rungs of the partially cylindrical RF coil and rings connecting the rungs to generate a circularly polarized or elliptically polarized magnetic field. Further, high-frequency signals of the same reference frequency having a desired amplitude ratio and phase difference are supplied to the partially cylindrical RF coils and half-loops.10-18-2012
20120229137Method for NMR spectroscopy - A method for performing magnetic resonance spectroscopy on solid samples containing nuclei of interest with spin quantum number I subjects the sample to a static magnetic field. The sample is spun at the magic angle and broad-band excitation of transverse magnetization of the nuclei of interest is effected by applying a first train of rotor-synchronized rf-pulses, having a carrier frequency, to the nuclei of interest with a pulse duration 0.1 μs<τ09-13-2012
20120299592MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR MAGNETIC RESONANCE IMAGING - An embodiment of a magnetic resonance imaging apparatus is configured to carry out plural series of imaging while changing plural imaging conditions for a patient on a series basis, and has a storage unit configured to group plural parameter types related to some of the plural imaging conditions for carrying out the series of imaging into a plurality of groups, and to store a parameter value corresponding to one of the parameter types on a group basis, and has a controller which specifies a first series included in the plural series and a group to be used in the first series to read one of the parameter values belonging to the specified group from the storage unit, the controller setting the read parameter value as a parameter value related to some of plural imaging conditions to be used in a second series included in the plural series.11-29-2012
20120299591MARGIN ASSESSMENT OF EX-VIVO SAMPLE11-29-2012
20120299590Method for Self-Calibrated Parallel Magnetic Resonance Image Reconstruction - A method for producing a time-series of images of a subject with a magnetic resonance imaging (MRI) system is provided. The MRI system is used to acquire a time-series undersampled k-space data set, in which a selected number of k-space data subsets in the time-series data set includes both image data and calibration data. Moreover, the calibration data in each of these selected number of k-space data subsets includes a portion of a desired total amount of calibration data. For example, each of these selected number of k-space data subsets include calibration data that is acquired by sampling a different partition of a calibration data sampling pattern. A time-series of images of the subject is then produced by reconstructing images of the subject from the acquired time-series of undersampled k-space data sets. These images are substantially free of undersampling artifacts.11-29-2012
20110121829MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus according to an embodiment includes an imaging unit configured to carry out magnetic resonance imaging of a patient using a transmitting QD coil which allows at least one of phase and amplitude of a radio-frequency transmit pulse on at least one input channel of the transmitting QD coil to be adjusted independently of each other, and an adjustment unit configured to adjust at least one of the phase and the amplitude of the radio-frequency transmit pulse according to imaging conditions.05-26-2011
20100327869ULTRA-SENSITIVE SUSCEPTIBILITY DETECTION APPARATUS OF ANHARMONIC RESONANCE MEASUREMENT TYPE USING ATOMIC MAGNETOMETER, AND METHOD OF USING SAME - The ultra-sensitive susceptibility detection apparatus of anharmonic resonance measurement type using an atomic magnetometer detects a change in susceptibility by a specimen containing an object to be measured. The apparatus includes an atomic magnetometer. The atomic magnetometer includes a cell containing an alkaline metallic atom, a light source for magnetically polarizing the alkaline metallic atom of the cell, and a bias magnetic field applicator for applying a bias magnetic field to adjust a measuring resonance frequency of the alkaline metallic atom. The apparatus includes an excitation magnetic field applicator for applying an excitation magnetic fields of different frequencies to magnetically excite the specimen, but not to couple the excitation field directly to the measuring atomic resonance frequency, and a measuring device for measuring a change in magnetic polarization of the alkaline metallic atom, which is affected by a magnetic field caused by the specimen being magnetically excited by the excitation magnetic field.12-30-2010
20100327871MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD - A magnetic resonance imaging (MRI) apparatus sequentially transmits a plurality of radio frequency (RF) pulses for refocusing transverse magnetization of spins, and brings the transverse magnetization of the spins to longitudinal magnetization after the refocusing of the transverse magnetization of the spins.12-30-2010
20100327870MOVABLE TABLE FOR MAGNETIC RESONANCE IMAGING - In MR imaging, the patient is placed on the table in a configuration convenient for a surgical procedure and while in the configuration the patient is moved into the field of view by moving the magnet longitudinally and the table is moved in the bore relative to the magnet so as to optimize the part to be imaged within the field of view of the magnet. After imaging the table is moved back to the preset position and removed from the magnet for the surgical procedure to commence or continue. The movement includes movement along the longitudinal axis; transverse movement side to side; rolling movement about a longitudinal axis; tilting movement about a transverse axis and bending movement of the table relative to at least one transverse hinge line in the table at a position spaced from the ends of the table.12-30-2010
20080297153Magnetic resonance imaging apparatus and magnetic resonance imaging method - A method includes collecting data for average units including acquisition of template data and acquisition of imaging data, calculating a frequency difference between a resonant frequency in a reference average unit and a resonant frequency of an object average unit based on a phase variation of the magnetic field in a period where the template data is collected in the reference average unit and a phase variation of the magnetic resonance signal in a period where the template data is collected in the object average unit, correcting a phase shift produced in image data collected in the object average unit constituted by one or more average units based on the frequency difference, and reconstructing an image concerning the subject based on the imaging data collected in the reference average unit and the corrected imaging data concerning the object average unit constituted by one or more average units.12-04-2008
20080297152SYSTEM AND METHOD OF PARALLEL IMAGING WITH CALIBRATION TO A SEPARATE COIL - An RF coil assembly includes a plurality of RF source coils and an RF target coil separate from the plurality of RF source coils. A computer is programmed to acquire MR data of an imaging object from each of the plurality of RF source coils and to acquire MR data of the imaging object from the RF target coil. The computer is further programmed to calculate a set of weights based on a relationship between MR data acquired from each RF source coil and MR data acquired from the RF target coil and to reconstruct an image based on an application of the set of weights to at least a portion of the MR data acquired from each of the plurality of RF source coils.12-04-2008
20120262171Method of magnetic resonance imaging for the selection and recording of curved slices - A method of MR imaging applies a magnetic field B10-18-2012
20120262166COMBINED CORRELATION PARAMETER ANALYSIS - Apparatus, methods, and other embodiments associated with combined correlation parameter estimation are described. One example method includes accessing data associated with a magnetic resonance (MR) signal produced by relaxation of nuclei in an item that has experienced nuclear magnetic resonance (NMR) excitation. The MR signal is a function of two or more NMR parameters. The example method also includes accessing data associated with a set of comparative signal evolutions and computing a value for an NMR parameter based on a combined correlation of the data associated with the MR signal to the data associated with the set of comparative signal evolutions. The combined correlation will depend on at least two correlations between the data associated with the MR signal and two different members of the set of comparative signal evolutions.10-18-2012
20120319686METHOD FOR SIMULTANEOUS MULTI-SLICE MAGNETIC RESONANCE IMAGING USING SINGLE AND MULTIPLE CHANNEL RECEIVER COILS - A method for reconstructing a plurality of images depicting a subject from image data that is simultaneously acquired from a corresponding plurality of slice locations with a magnetic resonance imaging (MRI] system is provided. Image data is acquired following the application of radio frequency (RF] energy to the plurality of slice locations. The RF energy is tailored to provide a different phase to each of the plurality of slice locations. Reference image data is also acquired for each slice location following the application of RF energy that has the same phase as is used to excite the respective slice location for the acquisition of the image data. Aliased images are reconstructed from the image data, and reference images are reconstructed from the reference image data. Using both of these image sets, an unaliased image is produced for each of the plurality of slice locations.12-20-2012
20120319685Method for Compensating for Respiratory Motion in Magnetic Resonance Imaging - A method for compensating for respiratory motion of a structure imaged by a magnetic resonance (MR) scanner, such as heart, is disclosed. The method comprises obtaining a sequence of navigator samples (12-20-2012
20110037466Magnetic resonance imaging apparatus and magnetic resonance imaging method - A magnetic resonance imaging apparatus includes an imaging unit which applies a labeling pulse to invert a spin included in a labeling region within part of a imaging region and then collects a echo signal from a time point when an inversion time has passed from the application of the labeling pulse, and a control unit, the control unit controlling the imaging unit so that the echo signal in the imaging region is collected a plurality of times with variations in the inversion time, the control unit also controlling the imaging unit so that a time ranging from a reference time point within a biological signal obtained from a subject to the application of the labeling pulse is a time determined in accordance with the inversion time.02-17-2011
20120268127System and Method for Spatially Encoding Nuclear Magnetic Resonance Signals Using Magnetic Susceptibility Effects - A device for spatially encoding nuclear magnetic resonance signals is provided. The device includes a plurality of spatial-encoding elements configured to produce a spatial-encoding magnetic field in the presence of an external magnetic field, such as the main magnetic field of a magnetic resonance imaging (“MRI”) system. The spatial-encoding elements include paramagnetic and diamagnetic spatial-encoding elements. The device further includes a support configured to hold the plurality of spatial-encoding elements in a fixed arrangement. By adjusting the orientation of the device, the spatial-encoding elements are moved relative to each other and thereby produce a plurality of different spatial-encoding magnetic fields. These spatial-encoding magnetic fields are used to spatially encode nuclear magnetic resonance signals emanating from spins in a volume-of-interest adjacent the device. An image reconstruction method for reconstructing images from signals spatially-encoded with the device is also provided.10-25-2012
20120268125DYNAMIC ADAPTATION OF A DEPHASING GRADIENT PAIR - In a method for optimization of a flow coding with switching of an additional bipolar dephasing gradient pair, used in a magnetic resonance (MR) phase contrast angiography, the strength of the flow coding is selected depending on the flow velocity in the vessels that should be depicted. MR signals of an examination region are acquired with continuously running overview measurements, with an operator-selected flow coding strength. After the selected flow coding strength is adopted automatically for the next measurement of the continuously running overview measurements, and two partial measurements with different flow codings are implemented for each selected strength and a phase difference image from the two partial measurements is calculated and depicted in real time, and the selected flow coding strength is automatically adopted for the MR phase contrast angiography.10-25-2012
20120268128Method for Principal Frequency Magnetic Resonance Elastography Inversion - A method for calculating a mechanical property of a material using a magnetic resonance imaging (“MRI”) system is provided. The method is particularly robust to image data having low signal-to-noise ratio (“SNR”). An MRI system is used to acquire magnetic resonance elastography (“MRE”) data from a subject containing the material. Exemplary materials include lung tissue. Images are reconstructed from the MRE data and used to produce a wave image from which a spatial frequency spectrum is produced. A principal frequency of the spatial frequency spectrum is produced and used to calculate a mechanical property of the material. For example, shear stiffness may be calculated.10-25-2012
20120326721SIMULTANEOUS AND DYNAMIC DETERMINATION OF LONGITUDINAL AND TRANSVERSAL RELAXATION TIMES OF A NUCLEAR SPIN SYSTEM - The invention relates to a magnetic resonance imaging method for simultaneous and dynamic determination of a longitudinal relaxation time T12-27-2012
20120268124Method for quasi-continous dynamic motion correciton in magnetic resonance measurements - A method of MR imaging and spectroscopy reduces artifacts occurring due to the motion of an object to be represented, wherein the object position is determined quasi-continuously during the runtime of the MR acquisition, which includes one or more partial acquisitions (TA), and wherein motion correction is performed, which comprises dynamic adaptation of the frequency and phase settings of the RF system of the tomograph and of the orientation and amplitudes of the gradients during the runtime of the MR acquisition according to the current object position. The motion correction is thereby applied during a signal weighting period, during a signal read-out period, or between and/or during the two stated periods and the adaptations for motion correction are performed without interrupting or slowing the temporal progression of the MR acquisition. In this way, artifacts due to motion of the object to be represented can be further reduced.10-25-2012
20120268126INCREASING THE PERFUSION SIGNAL TO NOISE RATIO (SNR) IN VELOCITY SELECTIVE ARTERIAL SPIN LABELING (VSASL) IN MAGNETIC RESONANCE IMAGING - Techniques, systems computer program products are disclosed increasing tagging efficiency in velocity selective arterial spin labeling using multiple velocity selective saturation modules. In one aspect, a magnetic resonance imaging method for tagging arterial blood includes using two or more velocity selective saturation (VSS) modules to tag arterial blood. The tagged arterial blood is imaged.10-25-2012
20120268122SYSTEM AND METHOD FOR QUANTIFYING MR DATA ACQUIRED DURING A UTE SEQUENCE - A system and method for quantifying MR data acquired during a UTE sequence include a computer programmed to execute an MR scan comprising an application of an RF pulse, an echo time (TE) period, and an application of a data acquisition gradient pulse, wherein the TE period begins after the RF pulse and ends before the data acquisition gradient pulse. MR data of an imaging object are acquired during application of the data acquisition gradient pulse, and a phase image is reconstructed based on the acquired MR data. The computer is also programmed to calculate a first contribution of phase to the phase image during the application of the RF pulse, to calculate a second contribution of phase to the phase image by the application of the data acquisition gradient pulse, and to generate a frequency map based on the phase image and based on the first and second contributions of phase.10-25-2012
20120268120METHOD FOR ERROR COMPENSATED CHEMICAL SPECIES SIGNAL SEPARATION WITH MAGNETIC RESONANCE IMAGING - A method for producing an image of a subject with a magnetic resonance imaging (“MRI”) system, in which relative signal contributions from a plurality of different chemical species are separated, is provided. A plurality of different echo signals occurring at a respective plurality of different echo times are acquired with the MRI system and a signal model that accounts for relative signal components for each of a plurality of different chemical species is formed for each echo signal. Those echo signals containing errors, such as phase errors, magnitude errors, or errors indicative of a corrupted echo signal, are identified. The relative signal components for each of the plurality of different chemical species are then determined by fitting the echo signals with the signal model. Particularly, those echo signals identified as containing errors are fitted to the signal models in a manner that discards the error-containing information.10-25-2012
20120081115USING MEMRISTOR DEVICES AS SWITCHES FOR MRI COILS - A radiofrequency (RF) coil assembly (04-05-2012
20120081114System for Accelerated MR Image Reconstruction - An MR imaging system uses the multiple RF coils for acquiring corresponding multiple image data sets of the slice. An image data processor comprises at least one processing device conditioned for, generating a composite MR image data set representing a single image in a single non-iterative operation by performing a weighted combination of luminance representative data of individual corresponding pixels of the multiple image data sets in providing an individual pixel luminance value of the composite MR image data set. The image data processor reduces noise in the composite MR image data set by generating a reduced set of significant components in a predetermined transform domain representation of data representing the composite image to provide a de-noised composite MR image data set. An image generator comprises at least one processing device conditioned for, generating a composite MR image using the de-noised composite MR image data set.04-05-2012
20120081113MAGNETIC RESONANCE METHOD AND SYSTEM TO GENERATE AN IMAGE DATA SET - In a magnetic resonance method and system to generate an image data set with a magnetic resonance system at least two phase coding gradients are activated in respective spatial directions. An RF excitation pulse is radiated. At least one raw data point in a k-space data set belonging to the image data set is read out per time period after the radiation of the RF excitation pulse. The time period for each raw data point is determined depending on a maximum strength achievable with the magnetic resonance system of the activated phase coding gradient that corresponds to the spatial direction in which the respective raw data point has the largest gradient moment in terms of absolute value. The maximum strength of this phase coding gradient that can be achieved with the magnetic resonance system is determined depending on the determined largest gradient moment.04-05-2012
20120081112MAGNETIC RESONANCE IMAGING METHOD, SYSTEM AND COMPUTER-READABLE STORAGE MEDIUM - In a magnetic resonance method and system to acquire an MR image using a pulse sequence that sets the magnetization vector in the steady state into a stable oscillation under RF excitation pulses radiated at a time interval of time TR, the phase coding gradients for coding a k-space line in k-space of the pulse sequence (which k-space corresponds to the desired MR image) are switched such that the first moment of the phase coding gradient is minimal at the point in time of the radiation of an RF excitation pulse without the repetition time TR being extended relative to pulse sequences with unminimized phase coding gradients.04-05-2012
20100231218Method for Producing A Magnetic Resonance Image of an Object Having a Short T2 Relaxation Time - A method for producing a magnetic resonance image using an ultra-short echo time. The method includes applying a pulse sequence to an object, detecting a spirally encoded and phase encoded magnetic resonance signal associated with the object, and reconstructing the magnetic resonance image based on the spirally encoded and phase encoded magnetic resonance signal. The pulse sequence includes a slab-selective radiofrequency pulse, a slab-selective gradient pulse, a plurality of variable duration slice encoding gradient pulses, a plurality of first spiral encoding gradient pulses, and a plurality of second spiral encoding gradient pulses. The detection of the spirally encoded and phase encoded magnetic resonance signal occurs concurrently with the application of one of the plurality of first spiral encoding gradient pulses and with the application of one of the plurality of second spiral encoding gradient pulses.09-16-2010
20100231217MAGNETIC RESONANCE METHOD AND APPARATUS TO ACQUIRE MULTIPLE IMAGE DATA SETS FROM A SUBJECT - In a magnetic resonance (MR) method and apparatus for the acquisition of a first image data set and a second image data set of an examination subject, a series of excitation pulses is radiated into the examination subject, and after each excitation pulse, a first echo signal is detected after a first echo time TE09-16-2010
20120086449MAGNETIC RESONANCE SYSTEM AND METHOD FOR COMPREHENSIVE IMPLANTABLE DEVICE SAFETY TESTS AND PATIENT SAFETY MONITORING - A magnetic resonance method comprises: performing (C04-12-2012
20120280686MEASURING BIOLOGICAL TISSUE PARAMETERS USING DIFFUSION MAGNETIC RESONANCE IMAGING - Methods, devices and systems are disclosed for measuring biological tissue parameters using restriction spectrum magnetic resonance imaging. In one aspect, a method of characterizing a biological structure includes determining individual diffusion signals from magnetic resonance imaging (MRI) data in a set of MRI images that include diffusion weighting conditions (e.g., diffusion gradient directions, diffusion gradient strengths, sensitivity factors (b-values), or diffusion times), combining the individual diffusion signals to determine a processed diffusion signal corresponding to at least one location within one or more voxels of the MRI data, calculating one or more parameters from the processed diffusion signal by using the diffusion weighting conditions, and using the one or more parameters to identify a characteristic of the biological structure, in which the one or more parameters include values over a range of one or more diffusion length scales based on at least one of diffusion distance or diffusion rate.11-08-2012
20120280685Linear Phase Microstrip Radio Frequency Transmit Coils - Systems, devices and methods provide an RF coil which produces a field having linear phase variation across an imaging volume. In one embodiment, a coil comprises multiple microstrip elements configured to have an increased effective electrical length. This increase in electrical length allows for a larger linear phase shifts over the length of the microstrip element which in turn increases linear phase variation capabilities. This may be accomplished by increasing the effective dielectric properties of the microstrip element. Increasing the effective dielectric may be accomplished by utilizing distributed capacitors along the length of a microstrip element (e.g. lumped element capacitors), by altering the materials used to fabricate the microstrip element, etc. Additionally, increasing the effective dielectric may be accomplished using a combination of these means. Embodiments may further enable linear phase variation along the imaging volume at high frequencies, such as frequencies utilized for 3 T and above MRI devices.11-08-2012
20120280684APPARATUS AND METHOD FOR RECONSTRUCTING 3D IMAGE BY USING MAGNETIC RESONANCE IMAGING - An apparatus for reconstructing 3D images by using magnetic resonance imaging (MRI) includes an image acquiring unit configured to acquire a plurality of MR images about a region of interest of an object at different angles, respectively; and an image reconstructing unit configured to reconstruct the 3D image by using the plurality of MR images, wherein the plurality of MR images include information of a slice direction about the region of interest, which is changed depending on the different angles. According to the invention, since the 3D image is reconstructed by using the MR images acquired at different angles, the 3D image may have a better SNR than the method for;reconstructing 3D images of the related an.11-08-2012
20120280683SYSTEM AND METHOD FOR MAGNETIC RESONANCE RADIO-FREQUENCY FIELD MAPPING - A system and method for radio-frequency (RF) field mapping are provided. One method includes encoding a B11-08-2012
20120092011MAGNETIC RESONANCE METHOD AND SYSTEM TO DETERMINE THE POSITION OF A SLICE RELATIVE TO A REGION MOVING RELATIVE TO THE SLICE - In a magnetic resonance method and system to determine a position of a slice relative to a region moving relative to the slice within a predetermined volume segment of an examination subject located in the magnetic resonance system, a physical property within the slice is detected with spatial resolution at multiple points in time, such that a time curve of the physical property is detected for at least one voxel of the slice. The position of the slice relative to the region is determined with respect to defined points in time, depending on the time curve.04-19-2012
20120092010LOCALISATION OF MAGNETIC PARTICLES BY MEANS OF SWIFT-MRI - Positive contrast localization of magnetic (e.g. superparamagnetic) particles in vivo or in vitro by means of SWIFT-MRI using the imaginary component of MR image data in combination with an anatomic reference image derived from the real or magnitude component.04-19-2012
20120092009AUTOCALIBRATING PARALLEL IMAGING RECONSTRUCTION METHOD FROM ARBITRARY K-SPACE SAMPLING WITH REDUCED NOISE - A computer implemented method for magnetic resonance imaging is provided. A 3D Fourier Transform acquisition is performed with two phase encode directions, wherein phase code locations are chosen so that a total number of phase encodes is less than a Nyquist rate, and closest distances between phase encode locations takes on a multiplicity of values. Readout signals are received through a multi-channel array of a plurality of receivers. An autocalibrating parallel imaging interpolation is performed and a noise correlation is generated. The noise correlation is used to weight a data consistency term of a compressed sensing iterative reconstruction. An image is created from the autocalibration parallel imaging using the weighted data consistency term. The image is displayed.04-19-2012
20120286782Method for NMR spectroscopy with sustained induction decays of long-lived coherences - A method for nuclear magnetic resonance (NMR) spectroscopy of a sample involves excitation of long lived coherences (LLC) between the singlet state S11-15-2012
20120133362MAGNETIC RESONANCE METHOD AND SYSTEM FOR PHASE CORRECTION OF MAGNETIC RESONANCE SIGNALS ORIGINATING IN MIXED TISSUE - In a magnetic resonance (MR) system and method to separate an MR system-dependent phase influence from a subject-dependent phase influence in phase values of an MR phase image data set of an examination subject acquired, to which two different tissue types with different resonance frequencies make a signal contribution, the system-dependent phase influence is determined by selecting a contour around a region shown in the MR phase image data set, calculating the system-dependent phase influence in this region with the assumption that the spatial curve of the background phase corresponds to a harmonic or quasi-harmonic function, and subtracting the system-dependent phase influence from the acquired phase image data set to determine the subject-dependent phase influence.05-31-2012
20120139539METHOD FOR GENERATING A PULSE SEQUENCE TO ACQUIRE MAGNETIC RESONANCE DATA, AND OPERATING METHOD AND MAGNETIC RESONANCE SYSTEM EMPLOYING THE GENERATED PULSE SEQUENCE - In a method for generating a pulse sequence for operating a magnetic resonance (MR) system for acquiring data from an examination subject having an interfering object in the patient's body, the bandwidths of at least two of the RF (radio-frequency) pulses in the pulse sequence are matched such that the matched RF pulses respectively excite a congruent slice when they are radiated into an examination subject under the effect of a slice selection gradient of identical amplitude. The matching of the RF pulses in the manner ensures so that the respective slices excited by the at least two RF pulses are subject to the same nonlinearities and inhomogeneities, and therefore the same spatial distortions, and so that signal losses due to inconsistent excitations of the two pulses are avoided. The image data that can be acquired with the pulse sequence are therefore optimized.06-07-2012
20120139538MRT RECEIVER COIL WITH LOCAL DATA STORAGE - The present embodiments relate to a method and a local coil arrangement for a magnetic resonance tomography system. The local coil arrangement includes an antenna element for the reception of signals from an object under examination. The local coil arrangement also includes an A/D converter for the conversion of analog signals received with the antenna element into digitized signals, and a memory configured for the storage of the digitized signals.06-07-2012
20120139537SIMULTANEOUS ASL/BOLD FUNCTIONAL MRI - This disclosure is generally drawn to methods, systems, appliances and/or apparati related to obtaining magnetic resonance imaging (MRI) images. More specifically, the disclosure relates to obtaining MRI images using arterial spin labeling (ASL) and blood-oxygen-level dependence functional magnetic resonance imaging (BOLD-fMRI) techniques. In some examples, a method of obtaining magnetic resonance imaging (MRI) image(s) is provided. An example method may include providing arterial spin labeling (ASL) labeling, obtaining at least one ASL acquisition after ASL labeling, and obtaining at least one blood-oxygen-level dependence functional magnetic resonance imaging (BOLD-fMRI) acquisition after ASL labeling.06-07-2012
20130009641MAGNETIC RESONANCE IMAGING APPARATUS AND CONTROL DEVICE OF A MAGNETIC RESONANCE IMAGING APPARATUS - According to one embodiment, a control device (01-10-2013
20130015856MRI MICROSCOPE ADAPTER - Disclosed embodiments pertain to an inventive method and apparatus that confers the ability to image using Magnetic Resonance Imaging (MRI) to an optical microscope. Through implementation of the disclosed embodiments, it is possible to collect spectroscopic information as well as anatomic information using the objective structure and/or MRI-enabled stage.01-17-2013
20130021031Fourier Tickling For Homonuclear Decoupling in NMR - A method for high resolution NMR (=nuclear magnetic resonance) measurements using the application of excitation pulses and the acquisition of data points, whereby a dwell time Δt separates the acquisition of two consecutive data points, which is characterized in that one or more tickling rf (=radio frequency) pulses of duration τ01-24-2013
20130021030MR Imaging System for Automatically Providing Incidental Findings - A system automatically concurrently performs an MR image study acquisition and supplementary image data acquisition. The system includes a detector for providing a signal indicating individual portions of an imaging scan using a first imaging method have ceased. An image data processor automatically concurrently interleaves imaging of a first anatomical portion using the first imaging method and supplementary imaging of a second anatomical portion using a different second imaging method, in response to the signal. The image data processor incorporates identifier data in data representing images acquired using the second imaging method identifying images acquired using the second imaging method differently from images acquired using the first imaging method.01-24-2013
20130134972METHOD AND SYSTEM FOR B1 FIELD MAPPING IN MAGNETIC RESONANCE IMAGING - A method of B1 field mapping relating to Magnetic resonance imaging (MRI) is given. In the method, RF and gradients are applied to excite and select a linear projection through a volume of interest; a radio frequency pulse sequence is transmitted to impart B1 dependent phase to the linear projection, following which a one dimensional spatial encoding signal is acquired along the linear projection; Subsequently a B1 field map based on the one dimensional spatial encoding signal is reconstructed.05-30-2013
20080231273MAGNETIC RESONANCE IMAGING APPARATUS, MAGNETIC RESONANCE IMAGING METHOD AND SENSITIVITY DISTRIBUTION MEASURING APPARATUS - A magnetic resonance imaging apparatus which executes a scan for allowing an RF coil unit to transmit RF pulses to an imaging area of a subject in a static magnetic filed space and allowing the RF coil unit to acquire magnetic resonance signals generated in the imaging area, includes: a scan section which executes, as the scan, each of an actual scan for acquiring the magnetic resonance signals as actual scan data and a reference scan for acquiring the magnetic resonance signals as reference scan data; an image reconstruction unit which reconstructs an actual scan image about the imaging area, based on the actual scan data and reconstructs a reference scan image about the imaging area, based on the reference scan data; a transmission sensitivity distribution calculating unit which calculates a transmission sensitivity distribution at the transmission of the RF pulses by the RF coil unit in the imaging area, based on the reference scan image and the actual scan image; and an image correcting unit which corrects the actual scan image using the transmission sensitivity distribution, wherein the transmission sensitivity distribution calculating unit includes: a division image generating part which executes image processing for dividing the first reference image by the second reference image, thereby generating a division image; a labeling information generating part which executes a labeling process on the division image thereby to generate labeling information about the division image; a segmentation process executing part which executes a segmentation process on the actual scan image, based on the labeling information thereby to extract a plurality of segments from the actual scan image; and a fitting processing part which calculates relational expressions indicative of relationships between pixel values of pixels constituting the segments and pixel positions thereof with respect to the segments extracted from the actual scan image, by performing a process for fitting to polynomial models, and wherein the transmission sensitivity distribution is calculated based on the relational expressions calculated by the fitting processing part.09-25-2008
20130169274MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus includes a magnetic resonance data acquisition unit and a cerebrospinal fluid image data generation unit. The magnetic resonance data acquisition unit consecutively acquires a plurality of magnetic resonance data for generating a plurality of cerebrospinal fluid image data, each corresponding to a different data acquisition time, after a labeling pulse is applied. The cerebrospinal fluid image data generation unit generates the plurality of cerebrospinal fluid image data based on the plurality of magnetic resonance data.07-04-2013
20130169275MAGNETIC RESONANCE IMAGING METHOD AND MAGNETIC RESONANCE IMAGING DEVICE - A magnetic resonance imaging method and imaging device are disclosed. The magnetic resonance imaging method includes dividing the current slab of an imaging region into an initial number of detection sub-slabs, and expanding the encoded thickness of each detection sub-slab according to a predetermined initial expansion factor, subjecting each expanded detection sub-slab to deformation detection using the first fast spin echo sequence, and determining the position of each imaging sub-slab of the current slab and an expansion factor corresponding to each imaging sub-slab, wherein the readout gradient of the first fast spin echo sequence is applied in the direction of the slice selection gradient, expanding the encoded thickness of each imaging sub-slab of the current slab of the imaging region on the basis of the determined position of each imaging sub-slab and the corresponding expansion factor, and performing an imaging scan of each expanded imaging sub-slab using a second fast spin echo sequence.07-04-2013
20080224700System and method for displaying medical imaging spectral data as hypsometric maps - A system and method for displaying MR spectroscopy data acquired using a magnetic resonance imaging (MRI) system includes acquiring MR spectroscopy data from a region of interest using the MRI system. The MR spectroscopy data is processed to determine relative spectral amplitudes of each of a plurality of points in the MR spectroscopy data resulting from frequency components of molecules in the region of interest. Each of the plurality of points is mapped to a particular optical parameter based at least upon on the relative spectral amplitude associated with each point and a point is generated for each of the plurality of points having the optical parameter mapped thereto. The points for each of the plurality of points are arranged to form a hypsometric map.09-18-2008
20080224699MAGNETIC RESONANCE METHOD AND APPARATUS WITH NUCLEAR SPINS TYPE-SPECIFIC SIGNAL SUPPRESSION - A method in the form of a sequence for magnetic resonance imaging with which image data of a subject to be examined are acquired and with which signals of nuclear spins of a specific type are suppressed, includes the steps of (a) application of a suppression module to suppress signals of the nuclear spins of the specific type, (b) application of an acquisition module after a wait time to acquire measurement data, (c) repetition of the steps (a) and (b) one or more times, respectively after a repetition time and, (d) before the steps (a), (b) and (c), application of a spin preparation module that shifts a magnetization of the nuclear spins of the specific type into a steady state condition that is maintained through the application of the subsequent steps (a), (b) and (c). Alternatively, instead of the spin preparation module the first suppression module can be fashioned such that it has an RF pulse with a flip angle selected such that the magnetization of the nuclear spins of the specific type is shifted into a steady state condition.09-18-2008
20080224698MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus which executes a mask scan for acquiring, as mask data, magnetic resonance signals produced in an imaging area in which a fluid flows through a subject, in a state in which a contrast agent is not injected into the fluid, and an imaging scan for acquiring, as imaging data, magnetic resonance signals produced in the imaging area in which the fluid containing the contrast agent flows after the injection of the contrast agent into the fluid, so as to correspond to a TRICKS method, thereby sequentially generating images about the imaging area along a time base, said magnetic resonance imaging apparatus includes 09-18-2008
20110260726PHASE LABELING USING SENSITIVITY ENCODING: DATA ACQUISITION AND IMAGE RECONSTRUCTION FOR GEOMETRIC DISTORTION CORRECTION IN EPI - A phase labeling using sensitivity encoding system and method for correcting geometric distortion caused by magnetic field inhomogeneity in echo planar imaging (EPI) uses local phase shifts derived directly from the EPI measurement itself, without the need for extra field map scans or coil sensitivity maps. The system and method employs parallel imaging and k-space trajectory modification to produce multiple images from a single acquisition. The EPI measurement is also used to derive sensitivity maps for parallel imaging reconstruction. The derived phase shifts are retrospectively applied to the EPI measurement for correction of geometric distortion in the measurement itself.10-27-2011
20130169276BIOLOGICAL DETECTOR AND METHOD - A biological detector includes a conduit for receiving a fluid containing one or more magnetic nanoparticle-labeled, biological objects to be detected and one or more permanent magnets or electromagnet for establishing a low magnetic field in which the conduit is disposed. A microcoil is disposed proximate the conduit for energization at a frequency that permits detection by NMR spectroscopy of whether the one or more magnetically-labeled biological objects is/are present in the fluid.07-04-2013
20130176026Magnetic Resonance Imaging Methods - A method of investigating an object using nuclear magnetic resonance (NMR) equipment includes generating a one-dimensional projection of the object for each of a plurality of echoes utilizing echo train signal indications resulting from pulse sequences, and utilizing the plurality of one-dimensional projections, for each of the plurality of echoes, generating NMR image data for at least one location in the object. The NMR image data may be displayed. The displayed data may include a T2 decay curve, a T2 value display, a T2 distribution graph, or petrophysical data for at least one object location.07-11-2013
20130176027MAGNETIC RESONANCE IMAGING OF CHEMICAL SPECIES - The invention relates to a method of imaging at least two chemical species using magnetic resonance imaging with signal separation for the two chemical species, the method comprising:—acquiring first and second echo data at different echo times resulting in a first and second acquired complex dataset,—modelling the first and second acquired dataset, said modelling comprising a spectral signal model of at least one of the chemical species,—identifying in the first and second acquired dataset the voxels for which the modelling yields a single, unambiguous mathematical solution for the signal separation, and—resolving the ambiguity for the voxels for which the modelling yields more than one mathematical solution, if any such voxels remain.07-11-2013
20080218169METHODS FOR FAT SIGNAL SUPPRESSION IN MAGNETIC RESONANCE IMAGING - The present invention is directed to methods for chemical species signal suppression in magnetic resonance imaging procedures, wherein Dixon techniques are enhanced by continuously sampling techniques. In the invention, k-space data is acquired during the entire period of read gradient associated with a gradient echo pulse acquisition scheme. The invention utilizes a total sampling time (TST) acquisition during the entire read gradient, using three echoes of a TST data set to achieve chemical species separation in both homogenous fields as well as areas of field inhomogeneity. As an example, a continuously sampled rectilinearly FLASH pulse sequence is modified such that the time between echoes was configured to be 2.2 milliseconds, with TE selected to allow 180° phase variation in the fat magnetization between each of the three TE's (TE09-11-2008
20080218167MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus has a controller which controls an operation of a scan section in such a manner that the scan section executes a scan in an imaging sequence, based on the imaging sequence condition set so as to correspond to a slice tracking method by an imaging sequence condition setting unit, and controls the operation of at least one of the scan section and an image reconstruction unit, based on a phase difference calculated by a phase difference calculation unit so as to eliminate the phase difference at which phases of the magnetic resonance signals produced in an imaging slice areas change, when an RF pulse subsequent to having been adjusted in frequency so as to the slice tracking method is transmitted upon execution of the scan in the imaging sequence.09-11-2008
20120249144METHOD AND DEVICE TO GENERATE SPATIALLY RESOLVED QUASI-T2-WEIGHTED MAGNETIC RESONANCE SIGNALS - In a magnetic resonance method and device to generate spatially resolved, quasi-T2-weighted magnetic resonance signals from an examination region, an initial magnetization is flipped in a first direction with a first gradient-balanced SSFP sequence. Spatially coded first magnetic resonance signals from the first gradient-balanced SSFP sequence are detected during the transient portion of the first SSFP sequence. An initial magnetization is flipped in a direction opposite the first direction with a second gradient-balanced SSFP sequence. Spatially coded second magnetic resonance signals from the second gradient-balanced SSFP sequence during the transient portion of the second gradient-balanced SSFP sequence. The first and second magnetic resonance signals are constructively superimposed into overlay signals. Image data with a predominant T2 weighting are reconstructed from the overlay signals, or are used for spatially resolved estimation of the T2 relaxation time constant.10-04-2012
20120249142LOCAL COIL - A local coil for a magnetic resonance tomography system includes a housing with a recess for an object under examination. The local coil also includes a radio-frequency receive antenna system and one or more shim elements for homogenization of a static basic magnetic field of the magnetic resonance tomography system.10-04-2012
20120249140LOCAL COIL SYSTEM, MAGNETIC RESONANCE SYSTEM AND METHOD FOR TRANSMITTING SIGNALS FROM A LOCAL COIL - A local coil system for a magnetic resonance system has a local coil for detecting MR response signals and a transmitter for wirelessly transmitting signals to the magnetic resonance system. At least one pseudo random device is operable to change signals in a pseudo random fashion in order to avoid interferences in the imaging.10-04-2012
20120249139METHOD AND APPARATUS FOR REDUCTION OF SPECIFIC ABSORPTION RATE (SAR) IN MAGNETIC RESONANCE DATA ACQUISITION - In the acquisition of magnetic resonance data from an examination subject according to a pulse sequence that causes radiation into the examination subject of a radiated radio frequency (RF) pulse having a frequency spectrum and a slice profile with a relationship therebetween, the examination subject is substantially simultaneously, with the radiated RF pulse, to a non-linear magnetic field that alters the relationship in the radiated RF pulse between the frequency spectrum and the slice profile. The alteration of this relationship can be used, for example, to reduce the specific absorption rate (SAR) of the examination subject during the acquisition of the magnetic resonance data.10-04-2012
20130169273MAGNETIC RESONANCE SYSTEM, OPERATING METHOD AND CONTROL DEVICE TO GENERATE T2-WEIGHTED IMAGES USING A PULSE SEQUENCE WITH VERY SHORT ECHO TIMES - In a method to control a magnetic resonance system to generate magnetic resonance exposures of an examination subject, a first magnetic resonance radio-frequency pulse with a pulse length of at most 50 μs is initially emitted in a volume region of the examination subject. At least one second magnetic resonance radio-frequency pulse, whose phase is essentially rotated by 180° relative to the first magnetic resonance radio-frequency pulse, with a pulse length of at most 50 μs, is emitted in the same volume region of the examination subject in a predetermined time interval immediately after the first magnetic resonance radio-frequency pulse. An acquisition of raw data from the volume region of the examination subject then takes place. Furthermore, a control device for operating a magnetic resonance system as well as a magnetic resonance system with such a control device to implement such a method, are described.07-04-2013
20130134973Method for Determining a Control Sequence with Parallel Transmission - A method for determining a set of control parameters of a control sequence for a magnetic resonance device is provided. The set of control parameters is chosen from a plurality of sets of basic parameters. The method includes determining a mean flip angle for each set of basic parameters in an imaging region where an object exists using the set of basic parameters with a first measuring method. For each set of basic parameters, a signal strength of a magnetic resonance signal generated in the case of a reference flip angle of a second measuring method distinguished by a signal maximum or a signal minimum is determined, and the set of basic parameters having a signal strength that is extremal in accordance with the choice of reference flip angle is chosen as the set of control parameters.05-30-2013
20130113483MAGNETIC RESONANCE IMAGING APPARATUS AND CONTROL METHOD THEREOF - The magnetic resonance imaging apparatus includes a main magnet to generate a static magnetic field in an imaging region, a gradient coil assembly to form a gradient in the static magnetic field, a radio frequency (RF) coil assembly to apply a first RF pulse and second RF pulse with respect to n (n≧2) slice regions located at different positions in the imaging region, to excite atomic nuclei of the slice regions, and a controller to control the RF coil assembly to apply a first RF pulse and second RF pulse having a first center frequency f05-09-2013
20130113482METHOD TO GENERATE AN MR IMAGE, AND CORRESPONDING MAGNETIC RESONANCE SYSTEM - To generate an MR image, acquired MR data are entered into k-space on multiple uniform trajectories in k-space within a predetermined time period. The trajectories are acquired chronologically in a predetermined order before a predetermined point in time, and in a different order after the point in time. The i-th trajectory after the point in time in the different order is adjacent to the (n−i+1)-th trajectory in the predetermined order (n is the number of trajectories acquired before and after the point in time). Two trajectories are adjacent if a distance between them is less than a predetermined threshold. Except for the (n−i+1)-th trajectory, none of the trajectories acquired before the point in time has a distance from the i-th trajectory that is less than the threshold. The predetermined time period is set to be at a middle of a time period after an RF excitation pulse, such that a contrast change within the predetermined time period proceeds as linearly as possible over time.05-09-2013
20130113481APPARATUS AND METHOD FOR COMPENSATING ARTIFACT IN HIGHER ORDER DIFFUSION MAGNETIC RESONANCE IMAGING (MRI) - An apparatus and method for compensating for an artifact of higher order diffusion Magnetic Resonance Imaging (MRI) are provided. The apparatus includes a construction unit configured to construct a diffusion q-space matrix, a correction unit configured to correct an image shift in a phase encoding direction in the constructed diffusion q-space matrix, a reconstruction processing unit configured to reconstruct a q-space of a Diffusion Spectrum Imaging (DSI) based on the corrected image shift, and a tracking processing unit to process a DSI fiber tracking using the reconstructed q-space of the DSI.05-09-2013
20130093423Phase Unwrapping in Phase Contrast MR Imaging - Phase unwrapping is provided for phase contrast magnetic resonance (MR) imaging. The velocity values are unaliased. For a given location over time, a path over time through a directed graph of possible velocities at each time is determined by minimization of derivatives over time. The possible velocities are based on the input velocity, the input velocity wrapped in a positive direction, and the input velocity wrapped in a negative direction, so the selection to create the minimum cost path represents unaliasing of any aliased velocities.04-18-2013
20130119984TECHNIQUES FOR CORRECTING MEASUREMENT ARTIFACTS IN MAGNETIC RESONANCE THERMOMETRY - Techniques for correcting measurement artifacts in MR thermometry predict or anticipate movements of objects in or near an MR imaging region that may potentially affect a phase background and then acquire a library of reference phase images corresponding to different phase backgrounds that result from the predicted movements. For each phase image subsequently acquired, one reference phase image is selected from the library of reference phase images to serve as the baseline image for temperature measurement purposes. To avoid measurement artifacts that arise from phase wrapping, the phase shift associated with each phase image is calculated incrementally, that is, by accumulating phase increments from each pair of consecutively scanned phase images.05-16-2013
20110267055MAGNETIC RESONANCE IMAGING APPARATUS - According to a magnetic resonance imaging apparatus according to an embodiment, a Radio Frequency (RF) pulse applying unit applies to a subject a flip pulse for exciting spin of nuclei inside a subject body, and a flop pulse for refocusing the phase of the spin. A gradient magnetic-field applying unit applies a spoiler gradient magnetic field onto the subject after the flop pulse is applied, and applies a rewind gradient magnetic field before applying the flop pulse. A control unit executes a pulse sequence of controlling the gradient magnetic-field applying unit so as to keep each of the strengths of the spoiler gradient magnetic field and the rewind gradient magnetic field at respective predetermined values or higher with respect to each of a plurality of slice encodings.11-03-2011
20130127464BIOLOGICAL DETECTOR AND METHOD - A biological detector includes a conduit for receiving a fluid containing one or more magnetic nanoparticle-labeled, biological objects to be detected and one or more permanent magnets or electromagnet for establishing a low magnetic field in which the conduit is disposed. A microcoil is disposed proximate the conduit for energization at a frequency that permits detection by NMR spectroscopy of whether the one or more magnetically-labeled biological objects is/are present in the fluid.05-23-2013
20130127463Magnetic Resonance Antenna Arrangement and Magnetic Resonance System - A magnetic resonance antenna arrangement includes at least one first antenna group including individually-controllable first antenna conductor loops and a second antenna group adjacent to the first antenna group. The second antenna group includes individually-controllable, longitudinal second antenna elements. The first antenna conductor loops essentially extend in a first extending surface and are disposed in the first extending surface in a first direction in a row behind one another. The longitudinal second antenna elements extend with the longitudinal axes transverse to the first direction disposed in parallel next to one another in a second extending surface that runs essentially in parallel to the first extending surface. Each of the second antenna elements are coupled at first and second end areas to a conductive element to form a second conductor loop with the conductive element. The second antenna elements are disposed to overlap an adjacent first antenna loop in each case.05-23-2013
20130127462Method for Operating a Receiving Device for Magnetic Resonance Image Signals of a Body - A receiving device for magnetic resonance (MR) image signals of a body is operated in an MR system such that for at least one coil element of the receiving device, a space domain, in which a spatial sensitivity of the coil element satisfies a predetermined criterion, is determined. A center frequency and a bandwidth of the MR image signal radiated by the body in the space domain are determined for the space domain. A receive path disposed downstream of the coil element is parameterized for operation at the determined center frequency and with the determined bandwidth.05-23-2013
20130127460MR IMAGING USING NAVIGATORS - The invention relates to a method of magnetic resonance (MR) imaging of at least a portion of a body (05-23-2013
20130127461MRT System, Receive Apparatus for an MRT System and Method for Obtaining an MR Signal in an MRT System - A receive apparatus in a strong magnetic alternating field is disposed in a magnetic resonance tomography (MRT) system. The MRT system includes at least one receive apparatus for a magnetic resonance high frequency (MR-HF) signal. The receive apparatus includes a receive coil element for receiving the MR-HF signal, an optical modulator, in which an electrical control input is coupled to the receive coil element, and an optical output for outputting an output signal of the modulator. The optical modulator forms an optical demodulation device for the MR-HF signal. The optical modulator is coupled to a laser light source via an optical input that is configured to generate a laser light. A light intensity of the laser light varies periodically with a predetermined frequency.05-23-2013
20130134975VIRTUAL COIL EMULATION IN PARALLEL TRANSMISSION MRI - The invention relates to a virtual coil emulation method to be used in a magnetic resonance imaging scan for acquiring a magnetic resonance image of an object (05-30-2013
20130134974COMBINATION OF MR MEASUREMENT SIGNALS IN ORDER TO IMPROVE THE SIGNAL-TO-NOISE RATIO - In a computerized method, a magnetic resonance system, and a data storage medium encoded with programming instructions, n magnetic resonance (MR) signals are provided to a processor and, in the processor, a combination of the n associated MR signals is formed by calculating a median of the n associated MR signals, as an ideal MR signal. The ideal MR signal is then either stored or used for further processing.05-30-2013
20130141093Surface Electrode Design that can be Left in Place During MR Imaging - For use in MR imaging of a patient a plurality of surface electrodes such as ECG or defibrillator are provided for obtaining electrical signals for determining electrical activity within the body of the patient and remain in place during the MR imaging. The surface electrodes include a quick disconnect wire for carrying the signals to a signal processing system to be removed during the MR imaging to prevent heating. Each electrode comprises a conductive layer divided by slits into separate side by side sections to reduce eddy currents which are induced in the surface electrodes when they are exposed to variations in the magnetic field. The sections all are connected through the layer to the conductive location to allow the signal therefrom to be connected to the communication conductor.06-06-2013
20130141094MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - A magnetic resonance imaging apparatus according to an exemplary embodiment includes a first imaging unit, an identifying unit, and a second imaging execution unit. The first imaging execution unit acquires, after applying a labeling RF pulse to blood flowing into the myocardium of a subject, multiple non-contrast MR data for which the time intervals between labeling and acquiring data are different by performing sequential imaging of an imaging area including the myocardium in each segment of a k-space for a given time interval. The identifying unit identifies a time interval taken by the labeled blood to reach a given position in the imaging area. The second imaging execution unit sets the identified time interval and, after applying a labeling RF pulse to the blood flowing into the myocardium of the subject, acquires non-contrast MR data by imaging the imaging area including the myocardium.06-06-2013
20130141095NMR SPECTROSCOPY DEVICE BASED ON RESONANCE TYPE IMPEDANCE (IR) SENSOR AND METHOD OF NMR SPECTRA ACQUISITION - Processes and apparatuses are provided for contactless Nuclear magnetic resonance (“NMR”) spectrum acquiring and spectroscopic analysis and/or measuring or monitoring, in-line, in-situ and/or in real time, at least one composition or object under test of one or more solid, liquid, and/or gaseous substances and/or one or more bulk materials. One or more apparatus may include a resonance type impedance sensor having at least two coils, at least one coil of the at least two coils being at least one excitation coil, at least one other coil of the at least two coils being at least one sensing coil. The method(s) involve acquiring an NMR spectrum of an object under test while changing at least one of the frequency of an IR sensor and the intensity of the magnetic field applied to an object under test and/or sweeping intensity of the magnetic field applied to the object under test.06-06-2013
20130141096SYSTEMS AND METHODS FOR MEASURING NUCLEAR MAGNETIC RESONANCE SPIN-LATTICE RELAXATION TIME T1 AND SPIN-SPIN RELAXATION TIME T2 - A system for measuring nuclear magnetic resonance spin-lattice relaxation time T06-06-2013
20130141097MAGNETIC RESONANCE IMAGING APPARATUS - The MRI apparatus includes an image generating unit, an area setting unit, a slice condition determining unit and an imaging executing unit. The image generating unit images an object at a predetermined imaging position, and generates an image for positioning. The area setting unit sets a slab area and a slice area on a basis of a recommended value that is stored in a storage and corresponds to the predetermined imaging position, and to display the set slab area and the set slice area on the image for positioning, the storage storing the recommended value of a parameter concerning a slice condition for each of a plurality of imaging positions. The slice condition determining unit determines the slice condition on a basis of the slice area. The imaging executing unit executes an imaging of the slab area in accordance with the determined slice condition.06-06-2013
20130141092METHOD OF OPTIMIZING MAGNETIC RESONANCE SCANNING PARAMETERS06-06-2013
20130147476ACTIVE RESISTIVE SHIMMING FOR MRI DEVICES - Active resistive shim coil assemblies may be used in magnetic resonance imaging (MRI) systems to reduce in-homogeneity of the magnetic field in the imaging volume. Disclosed embodiments may be used with continuous systems, gapped cylindrical systems, or vertically gapped systems. Disclosed embodiments may also be used with an open MRI system and can be used with an instrument placed in the gap of the MRI system. An exemplary embodiment of the active resistive shim coil assembly of the present disclosure includes active resistive shim coils each operable to be energized by separate currents through a plurality of power channels. In some embodiments, the disclosed active resistive shim coil assemblies allow for various degrees of freedom to shim out field in-homogeneity.06-13-2013
20130200892Flexible Ordering for Multiple Slice MRI - A method of ordering slices for interleaved MRI is provided that includes selecting a number of interleaved slice locations (N08-08-2013
20080197846Magnetic Resonance Imaging With Several Types of Contrast - A magnetic resonance imaging system comprises a signal acquisition system to acquire magnetic resonance signals. A reconstructor reconstructs magnetic resonance images from the acquired magnetic resonance signals. The signal acquisition system and/or the reconstructor are controlled to perform overhead activities separately from actual acquisition of the magnetic resonance signals notably for different contrast types. Accordingly, time efficient signal acquisition for multiple contrasts is achieved.08-21-2008
20080197845MAGNETIC STRUCTURE FOR MRI MACHINES AND MRI MACHINE PARTICULARLY FOR ORTHOPEDIC OF RHEUMATOLOGIC APPLICATIONS - Magnetic structure for MRI machines, which machine has a U-shaped or annular, that is O-shaped geometry having two opposite poles between which a magnetic field is generated and are borne at a predetermined distance one with respect to the other by a magnetic yoke having an inverted U shape or an annular one, that is an O shape, which poles generating the magnetic field and/or at least a part of which yoke delimit a cavity housing at least a part of the patient body, while inside the volume of said cavity a partial volume is generated wherein values of the magnetic field are such to guarantee the acquisition of MRI images having quality characteristics sufficient to be used like diagnostic images, so called imaging volume.08-21-2008
20080197844METHODS AND APPARATUS FOR JOINT IMAGE RECONSTRUCTION AND COIL SENSITIVITY ESTIMATION IN PARALLEL MRI - A method of parallel magnetic resonance imaging (pMRI) comprising acquiring pMRI signals simultaneously through a plurality of receiving coils, wherein each coil has a localized sensitivity with respect to an imaged volume; jointly estimating values for the imaged volume and for a sensitivity function for at least one of the plurality of receiving coils; and transmitting the reconstructed image to a device.08-21-2008
20080197843Determination Of Relaxation Rate Changes For Mr Molecular Imaging - MR based molecular imaging is strongly supported by the accurate quantification of contrast agents. According to an exemplary embodiment of the present invention, a determination unit of an examination apparatus is adapted for determining an error propagation function, wherein the error propagation function is then used as a weighting function for an accurate determination Of AR08-21-2008
20130147475MAGNETIC RESONANCE SYSTEM AND METHOD THEREOF - A multi-channel coil assembly capable of being configured to operate in a first mode and a second mode is provided. The multi-channel coil assembly includes a plurality of coil elements and a plurality of mode switches. Each of the plurality of mode switches is switchably coupled to at least two of the coil elements. In the first mode, at least one of the mode switches is uncoupled to the coil elements forming a hyperthermia array. The hyperthermia array is configured to transmit first radio frequency signals in response to multiple first input signals supplied thereto. In the second mode, at least one of the mode switches is coupled to the coil elements forming a magnetic resonance (MR) array. The MR array is configured to transmit or receive second radio frequency signals in response to multiple second input signals supplied thereto.06-13-2013
20130147480MAGNETIC RESONANCE IMAGING APPARATUS, MAGNETIC RESONANCE IMAGING METHOD AND MEDICAL SYSTEM - According to one embodiment, a magnetic resonance imaging apparatus includes an imaging condition setting unit and an imaging unit. The imaging condition setting unit is configured to set slice positions same as past slice positions to a same object and to set a table position of a bed with the object set to position a position representing a slice position designated out of the slice positions or a position representing a slice range designated out of the slice positions on a center of a magnetic field. The imaging unit is configured to acquire magnetic resonance data from the slice positions set for the object at the table position of the bed to generate image data corresponding to the slice positions based on the acquired magnetic resonance data.06-13-2013
20130147481MAGNETIC RESONANCE IMAGING APPARATUS AND VIBRATIONAL ERROR MAGNETIC FIELD REDUCTION METHOD - Regardless of the measurement conditions, the degradation of the image quality due to a vibrational error magnetic field, which is generated by the vibration of the mechanical structure of an MRI apparatus, is reduced. In order to do so, error magnetic field image data indicating an error magnetic field distribution is acquired on the basis of an echo signal measured using a pulse sequence having a test gradient magnetic field, a parameter value of a damped vibration function showing a vibrational error magnetic field is calculated using the error magnetic field image data, and a correction magnetic field is calculated on the basis of the calculated parameter value of the damped vibration function showing the vibrational error magnetic field.06-13-2013
20130147482METHOD AND APPARATUS FOR VARYING ADAPTIVELY PULSE INTERVAL IN NMR-BASED WATER CONTENT MEASUREMENT - The invention relates to a NMR method for determining moisture content of a sample, in which method a sample is objected to a magnetic DC-field, the sample under magnetic DC-field is objected to a sequence of excitation pulses in RF-frequency with pulse interval for exciting hydrogen nuclei, and NMR signal of the excited hydrogen nuclei is measured. In accordance with the invention spin-lattice relaxation time is estimated for the sample, and pulse interval is adjusted longer than the estimated spin-lattice relaxation time.06-13-2013
20130147477ENDOGENOUS MAGNETIZATION CONTRAST IN MRI - An endogenous source of magnetic resonance image contrast of biological tissues is provided by modeling a conventional magnetization transfer (CMT) spectrum using z-spectral data and generating magnetization transfer ratio maps from the magnetization transfer spectrum at a frequency of interest. A contribution by the CMT spectrum from the z-spectral data is removed and a direct water saturation component is modeled using the z-spectral data with removed CMT spectrum (z-spectral). When this modeled direct water saturation component contribution is removed from the z-spectral, then the remaining z-spectra reflects new contrast due to chemical exchange saturation transfer (CEST) and magnetization transfer/exchange effect from aliphatic protons probably associated with labile proteins, peptides and lipids, named as novel magnetization transfer (NMT). This technique can be used to illustrate subtle changes in biological tissue as a result of diseases states, provide better visibility of brain white matter plaques, provide improved CEST contrast, provide better visualization of proteins, peptides, and lipids in biological tissue using NMT contrast, improve segmentation of white matter and gray matter in brain images, and the like.06-13-2013
20130147479Method for Monitoring Patient Exposure in a Magnetic Resonance Device - A method for monitoring an exposure experienced by a patient during an examination with a magnetic resonance device having a transmitter device is provided. The method includes determining a coil power loss from measured amplitudes and phases of a first measuring device, and determining an overall transmitted power from voltage measurement values of the second measuring device. The method also includes determining a specific absorption rate (SAR) value describing a power entering a patient from the coil power loss and the overall transmitted power and comparing the SAR value with at least one limit value. A transmission operation of the transmitter device is terminated if the at least one limit value is exceeded.06-13-2013
20100283465SYSTEM AND METHOD FOR TISSUE SPECIFIC MR IMAGING OF METABOLITES USING SPECTRAL-SPATIALLY FORMED STIMULATED ECHO - A system for magnetic resonance (MR) spectroscopy includes a plurality of gradient coils positioned about a bore of a magnet and an RF coil assembly coupled to a pulse generator to emit RF pulse sequences and arranged to receive resulting MR signals from a subject of interest. A system control is also included in the MR spectroscopy system and is coupled to the plurality of gradient coils and the RF coil assembly. The system control is programmed to cause the RF coil assembly to emit a first RF pulse and a second RF pulse, wherein at least one of the first and second RF pulses is spectrally selective and at least one of the first and second RF pulses is spatially selective. The system control is also programmed to cause the RF coil assembly to emit a third RF pulse after a pre-defined time delay to generate a stimulated echo and detect MR signals resulting from the stimulated echo.11-11-2010
20120256627MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE METHOD - According to one embodiment, a magnetic resonance imaging apparatus includes an imaging condition setting unit, a verification image generating unit and an imaging unit. The imaging condition setting unit is configured to set an imaging condition for applying radio frequency pre-pulses to adjust a contrast. The radio frequency pre-pulses includes a region selective radio frequency pulse. The verification image generating unit is configured to generate and display an image for verifying the contrast based on application conditions including an application region and an application number of the radio frequency pre-pulses. The imaging unit is configured to perform magnetic resonance imaging according to the imaging condition.10-11-2012
20120256626PARALLEL TRANSMISSION RF PULSE DESIGN WITH LOCAL SAR CONSTRAINTS - A method of designing a parallel transmission radio frequency (RF) pulse for a magnetic resonance imaging (MRI) system includes compressing a model for a subject to be scanned by the MRI system into a plurality of voxel clusters, each voxel cluster defining a virtual observation point with a peak sensitivity to local specific absorption rate (SAR) for the voxel cluster, and defining the parallel transmission RF pulse based on an approximation of a minimization criterion having a local SAR component based on the peak sensitivity of each virtual observation point, the approximation comprising a weighted sum of the local SAR values for each virtual observation point.10-11-2012
20100308827SYSTEM AND METHOD FOR MULTI-SPECTRAL MR IMAGING NEAR METAL - A system and method for multi-spectral MR imaging near metal include a computer programmed to calculate an MR pulse sequence comprising a plurality of RF pulses configured to excite spins in an imaging object and comprising a plurality of volume selection gradients and determine a plurality of distinct offset frequency values. For each respective determined offset frequency value, the computer is programmed to execute the MR pulse sequence having a central transmit frequency and a central receive frequency of the MR pulse sequence set to the respective determined offset frequency value. The computer is also programmed to acquire a three-dimensional (3D) MR data set for each MR pulse sequence execution and generate a composite image based on data from each of the acquired 3D MR data sets.12-09-2010
20100308826WIRELESS TRANSMIT AND RECEIVE MRI COILS - A magnetic resonance system (12-09-2010
20100308825METHOD AND DEVICE FOR SELECTING BODY MODEL POSITIONS FOR SAR MONITORING OF A MAGNETIC RESONANCE TRANSMIT ARRAY - In a method and a device for specific absorption rate monitoring in a magnetic resonance system wherein multiple transmit coils are independently charged with respective currents, a primary model point voxel and at least one auxiliary model point voxel are automatically selected from among multiple voxels that model a modeled examination subject. The primary model point voxel is that voxel in which an absolute maximum of a total field variable occurs that is produced by the respective electrical fields emitted by the transmit coils. The at least one auxiliary model point voxel is that voxel in which a relative maximum of the variable occurs. The primary model point voxel and the at least one auxiliary model point voxel are stored, and specific absorption rate monitoring of an actual examination subject in the magnetic resonance system is implemented during the acquisition of magnetic resonance data in respective voxels of the actual examination subject corresponding to the stored primary model point voxel and the stored at least one auxiliary model point voxel.12-09-2010
20100308824METHOD FOR RECONSTRUCTING IMAGES OF AN IMAGED SUBJECT FROM A PARALLEL MRI ACQUISITION - A parallel MR imaging method that uses a reconstruction algorithm that combines the GRAPPA image reconstruction method and the compressed sensing (CS) image reconstruction method in an iterative approach (12-09-2010
20100308823MAGNETIC RESONANCE IMAGING APPARATUS - According to one embodiment, a magnetic resonance imaging apparatus includes an electrocardio information acquisition unit and an image data generation unit. The electrocardio information acquisition unit acquires a magnetic resonance signal for estimating an electrocardiogram signal of an object in sync with a biomedical signal other than an electrocardiogram signal. The biomedical signal is acquired from the object and shows a cardiac beat. The electrocardio information acquisition unit further determines a time difference between a position of a reference wave of the electrocardiogram signal and a synchronous position of the biomedical signal. The position of the reference wave is estimated from the acquired magnetic resonance signal. The image data generation unit acquires a magnetic resonance signal for imaging corresponding to a specific time phase of the cardiac cycle in sync with the biomedical signal based on the time difference, to generate an image data corresponding to the specific time phase of the cardiac cycle from the acquired magnetic resonance signal for imaging.12-09-2010
20100308822Small Magnet and RF Coil for Magnetic Resonance Relaxometry - Small and inexpensive probeheads for use in nuclear magnetic resonance systems, in particular, magnetic resonance relaxometry systems are provided. The design of the magnet-radiofrequency coil configurations within the probeheads is guided by an excitation bandwidth associated with radiofrequency pulses to be applied to a sample.12-09-2010
20100308821Real-Time Magnetic Resonance Diffusion Imaging - A method for performing magnetic resonance diffusion imaging, comprising: (a) acquiring a sequence of magnetic resonance images of a target body (BS) using diffusion-encoding gradient pulses applied along a set of non-collinear orientations ( ) sampling a three-dimensional orientation space (AR); (b) estimating, from said sequence of images, a set of space- and orientation-dependent parameters representative of molecular diffusion within said target body; wherein said step of estimating a set of space- and orientation-dependent parameters representative of molecular diffusion within said target body is performed in real time by means of an incremental estimator such as a Kalman filter fed by data provided by said magnetic resonance images; characterized in that said three-dimensional orientation space (AR) selectively excludes a set of orientations (FR) for which magnetic resonance signal intensity is attenuated by diffusion below a threshold level.12-09-2010
20100308820EX-SITU NMR SPECTROSCOPY - A device for ex situ magnetic resonance analysis is disclosed. The device comprises a static magnetic field unit (12-09-2010
20120274324IMPROVED NMR MEASUREMENT BASED ON ANTIPHASE SIGNALS - A method of measuring magnetic resonance properties of an object, which includes a thermally polarized substance and a contrast agent exhibiting a nuclear magnetic resonance (NMR) antiphase signal (A), comprises the steps of subjecting the object in a stationary magnetic field to an excitation sequence including excitation radio frequency pulses, collecting NMR signals generated in the object including a background signal (B) generated by the thermally polarized substance and the antiphase signal (A) generated by the contrast agent, and reconstructing the magnetic resonance properties of the object based on the NMR signals, wherein the NMR signals are collected during the occurrence of the antiphase signal (A) and with a time delay relative to a maximum of the background signal (B). Furthermore, a measuring device for measuring magnetic resonance properties of an object, like an NMR spectrometer or an MRI device, is described.11-01-2012
20120274323MSC-SELMQC METHOD FOR SIMULTANEOUS MAPPING OF POLYUNSATURATED FATTY ACIDS, LACTATE AND CHOLINE IN HIGH FAT TISSUES - Systems and methods employing spin editing techniques to improve magnetic resonance spectroscopy (MRS) and magnetic resonance spectroscopic imaging (MRSI) are discussed. Using these spin editing techniques, magnetic resonance signals of one or more unwanted chemicals (that is, chemicals whose signals are to be filtered out or suppressed) chemicals can be suppressed, so that the signal(s) of a first set of chemicals can be obtained without signals from the one or more unwanted chemicals. Information about and differences between the molecular topologies of the first set of chemicals and the one or more unwanted chemicals can be used to design a sequence that suppresses the one or more unwanted chemicals while allowing acquisition of signal(s) from the first set of chemicals.11-01-2012
20120274322MAGNETIC RESONANCE IMAGING APPARATUS - A magnetic resonance imaging apparatus that carries out a pulse sequence for making a signal of a first substance within an object smaller than a signal of a second substance within the object. The pulse sequence includes an α°-pulse for exciting the object, a refocus pulse for refocusing a phase of spin within a region excited by the α°-pulse, and a readout gradient field for acquiring a magnetic resonance signal from the region. The α°-pulse has a spectral selectivity such that a transverse magnetization of the first substance is made smaller than a transverse magnetization of the second substance. The refocus pulse has a spectral selectivity such that a phase of spin of the second substance is refocused and refocusing of a phase of spin of the first substance is suppressed.11-01-2012
20120274325Imaging By Magnetic Resonance Adsorption, Elastography And Tomography - A microwave imaging system provides superior breast imaging resolution by combining MR microwave absorption and MR-compatible microwave tomography calculations. These techniques may also be supplemented with magnetic resonance elastography calculations, for example, to facilitate quick multispectral imaging.11-01-2012
20110234227Designing a time dependency for a k-space trajectory, in particular a spiral - A method for designing the time dependence function k09-29-2011
20110234226MAGNETIC RESONANCE IMAGING APPARATUS - According to one embodiment, a magnetic resonance imaging apparatus is provided. A first imaging unit captures a plurality of first image data including first and second reference frames. The frames include a reference position and a target region in an object. A movement amount calculation unit calculates a movement amount of a local position between the first and second reference frames. A correction parameter setting unit sets a first correction parameter for correcting body motion of the object, based on the movement amount. An error map generating unit generates a predictive error map including a pixel value corresponding to a predictive correction error. The predictive correction error is obtained from a predictive position based on the movement amount and a predictive correction position based on the first correction parameter. A display unit displays the predictive error map and the first image data.09-29-2011
20110234225Magnetic Resonance Method for Quantification of Transverse Relaxation Times - Apparatus and methods for quantification of transverse relaxation times (T09-29-2011
20110234224Modification of Frequency Response Profiles of Steady State Free Precession for Magnetic Resonance Imaging (MRI) - Apparatus and methods for modification of the frequency response profile of steady-state free precession (SSFP) type of magnetic resonance imaging (MRI) sequences. Using alternating dephasing moments within succeeding radiofrequency (RF) excitation pulses, the frequency response function of SSFP sequences can be modified to different shapes such as near triangular or bell shaped. The particular response function as produced by alternating dephasing moments can be used, among others, for functional brain MRI, MR spectroscopy or spatial encoding.09-29-2011
20110234223METHOD AND APPARATUS FOR IMPROVING THE QUALITY OF MR IMAGES SENSITIZED TO MOLECULAR DIFFUSION - In a method and apparatus for magnetic resonance (MR) imaging of an object, and in particular MR imaging that yields images sensitive to molecular diffusion, undesired image artifacts induced by the rhythmic motion of the apparatus are reduced by manipulating the amplitude, phase, and timing of the diffusion encoding gradient pulses in a manner that interrupts, diminishes, or cancels the rhythmic motion. The residual vibration is evaluated manually or automatically to make such manipulations.09-29-2011
20110234222METHOD AND DEVICE FOR RECONSTRUCTING A SEQUENCE OF MAGNETIC RESONANCE IMAGES - A method for reconstructing a sequence of magnetic resonance (MR) images of an object under investigation, includes the steps of (a) providing a series of sets of image raw data including an image content of the MR images to be reconstructed, the image raw data being collected with the use of at least one radiofrequency receiver coil of a magnetic resonance imaging (MRI) device, wherein each set of image raw data includes a plurality of data samples being generated with a gradient-echo sequence, in particular a FLASH sequence, that spatially encodes an MRI signal received with the at least one radiofrequency receiver coil using a non-Cartesian k-space trajectory, each set of image raw data includes a set of homogeneously distributed lines in k-space with equivalent spatial frequency content, the lines of each set of image raw data cross the center of k-space and cover a continuous range of spatial frequencies, and the positions of the lines of each set of image raw data differ in successive sets of image raw data, and (b) subjecting the sets of image raw data to a regularized nonlinear inverse reconstruction process to provide the sequence of MR images, wherein each of the MR images is created by a simultaneous estimation of a sensitivity of the at least one receiver coil and the image content and in dependency on a difference between a current estimation of the sensitivity of the at least one receiver coil and the image content and a preceding estimation of the sensitivity of the at least one receiver coil and the image content.09-29-2011
20100315085Modular Apparatus for Magnetic Resonance Imaging - The present invention discloses a modular MRI imaging system. The imaging system includes MRI radio-frequency antenna arrays separate from the patient support structure. The antenna arrays are affixed to a thin, flexible film such that they may be located next to the anatomical region of interest. In addition, multiple antenna arrays may be configured in various planar or three-dimensional arrangements to optimize the FOV and SNR. Separate patient support structures are provided that enhance ergonomics and patient stabilization. By removing the antenna from the housing, the support structures may be designed without the constraints of supporting the antenna or the associated electronics. The MRI imaging system further employs a preamplifier module. The preamplifier module houses the preamplifier and much of the other associated circuitry for each of the antennae. The preamplifier module operates to combine the signals from the antenna arrays and pass the signals to the MRI system.12-16-2010
20100315084SYSTEM, METHOD, AND APPARATUS FOR MAGNETIC RESONANCE RF-FIELD MEASUREMENT - An apparatus, system, and method including a magnetic resonance imaging (MRI) apparatus includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images, and a computer. The computer is programmed to apply a first off-resonant radio frequency (RF) pulse at a first frequency different than the resonant frequency to a plurality of nuclei excited at a resonant frequency, acquire a first signal from the plurality of nuclei after application of the first off-resonant RF pulse, determine a phase shift from the first signal based on the first off-resonant RF pulse, determine a B1 field based on the phase shift, and store the B1 field on a computer readable storage medium.12-16-2010
20100315083Nuclear Magnetic Resonance Method for Quantitative and Qualitative Measurement of Natural Products - Provided herein are various methods and systems for analyzing natural products by quantitative proton nuclear magnetic resonance (qHNMR). A method is provided for quantitative and qualitative determination of a natural product by 12-16-2010
20110254548METHOD FOR SIMULTANEOUS MULTI-SLICE MAGNETIC RESONANCE IMAGING - A method for multi-slice magnetic resonance imaging, in which image data is acquired simultaneously from multiple slice locations using a radio frequency coil array, is provided. By way of example, a modified EPI pulse sequence is provided, and includes a series of magnetic gradient field “blips” that are applied along a slice-encoding direction contemporaneously with phase-encoding blips common to EPI sequences. The slice-encoding blips are designed such that phase accruals along the phase-encoding direction are substantially mitigated, while providing that signal information for each sequentially adjacent slice location is cumulatively shifted by a percentage of the imaging FOV. This percentage FOV shift in the image domain provides for more reliable separation of the aliased signal information using parallel image reconstruction methods such as SENSE. In addition, the mitigation of phase accruals in the phase-encoding direction provides for the substantial suppression of pixel tilt and blurring in the reconstructed images.10-20-2011
20130154640MAGNETIC RESONANCE SYSTEM AND METHOD TO GENERATE A MAGNETIC RESONANCE IMAGE OF AN EXAMINATION SUBJECT - The invention concerns a method to generate an MR image of an examination subject of MR signals of the examination subject being detected with a receiver coil element of a magnetic resonance system. A spatially related sensitivity is determined for the receiver coil element. A mask is generated for the receiver coil element depending on the sensitivity of the receiver coil element in order to therewith mask a region of the MR image, in which region the receiver coil element has at least one predetermined sensitivity. At least one RF excitation pulse and at least one magnetic field gradient are activated to acquire MR data with the receiver coil element, and a preliminary MR image is generated depending on MR data acquired therewith. The mask of the receiver coil element is applied to the preliminary MR image in order to generate an MR image of the receiver coil element, and an MR image of the examination subject is generated from the MR image for the receiver coil element.06-20-2013
20130154641METHOD AND DEVICE TO GENERATE MAGNETIC RESONANCE IMAGE DATA OF AN EXAMINATION SUBJECT - In a method, magnetic resonance system and a reconstruction device for generation of magnetic resonance image data of an examination subject, raw magnetic resonance data are acquired in k-space, the raw magnetic resonance data including measurement values at multiple readout points that are arranged along multiple different trajectories in k-space. A displacement value is determined for each trajectory on the basis of the measurement values of a collection of multiple trajectories. Readout points of the raw magnetic resonance data are displaced by the displacement value, and image data are reconstructed from the displaced raw magnetic resonance data.06-20-2013
20130154642MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - In one embodiment, an MRI apparatus (06-20-2013
20130154643TECHNIQUES, SYSTEMS AND MACHINE READABLE PROGRAMS FOR MAGNETIC RESONANCE - The present disclosure provides various methods and systems for performing magnetic resonance studies. In accordance with many embodiments, image or other information of interest is derived from super radiant pulses.06-20-2013
20130154644LOW-FIELD NMR DEVICE FOR MEASURING THE WATER CONTENT OF SOLIDS AND SLURRIES - A Nuclear Magnetic Resonance (NMR) apparatus and method for measuring the water content of samples has a device to produce a main magnetic field; a sample receiving space within a main magnetic field; a device to excite a measurable RF magnetization to a sample placed into the sample receiving space at an operating frequency defined by the main magnetic field; a device to measure the RF signal produced by the excited sample; and a device to determine the water content in the sample based on the RF signal. The sample receiving space is capable of accommodating a sample having a volume of at least 0.5 dm06-20-2013
20130154637MEASUREMENT OF CHEMICAL EQUILIBRIUM RATIO USING A MAGNETIC RESONANCE SPECTROSCOPY SYSTEM - The use of selective RF excitation is discussed. A spectrally selective, large tip angle RF pulse is used to detect a weak signal from a first chemical species. A non-selective, small tip angle pulse is used in measuring a signal from a second chemical species in exchange with the first chemical species. The acquired resonance data provides maybe used to measure the ratio of the spectrally distinct species in exchange.06-20-2013
20130154638METHOD FOR COMPUTING PHARMACOKINETIC PARAMETERS IN MRI - The present invention relates to a method of dynamic contrast magnetic resonance imaging aimed to improve characterization of tissue image by improving accuracy of computed pharmacokinetic parameters such as K06-20-2013
20130154639METHOD OF CAPTURING MAGNETIC RESONANCE IMAGE AND MAGNETIC RESONANCE IMAGING APPARATUS USING THE SAME - A method captures a magnetic resonance image for increasing convenience of a user, and a magnetic resonance imaging (MRI) apparatus uses the method, which includes: obtaining shape information of a subject; adjusting a field of view (FoV) according to the shape information of the subject; setting a K-space corresponding to the adjusted FoV; and capturing the magnetic resonance image by using the set K-space.06-20-2013
20130181709MRI USING FASTER MULTIPLEXED ECHO PLANAR IMAGING (EPI) PULSE SEQUENCES - An MRI scanner and an MRI method that effectively reduce the inherent difference in timing of TE in the SIR images by using alternating polarity of the slice selective gradient pulse Gs and corresponding alternate polarity in RF phase offset in the excitation pulse. By using alternating polarity selective gradients, the refocusing gradient pulse on the Gs axis can be eliminated between the excitation pulses so that the time spacing between the multiple SIR excitation pulses is reduced, and therefore the time delay between onset of slice signal decay is reduced. This results in an earlier possible TE of the first excited slice, hence less signal decay and higher SNR, and overall the TE of different slices can be more nearly the same.07-18-2013
20130181710Method for Simultaneous Multi-Slice Magnetic Resonance Imaging - A method for multi-slice magnetic resonance imaging, in which image data is acquired simultaneously from multiple slice locations using a radio frequency coil array, is provided. By way of example, a modified EPI pulse sequence is provided, and includes a series of magnetic gradient field “blips” that are applied along a slice-encoding direction contemporaneously with phase-encoding blips common to EPI sequences. The slice-encoding blips are designed such that phase accruals along the phase-encoding direction are substantially mitigated, while providing that signal information for each sequentially adjacent slice location is cumulatively shifted by a percentage of the imaging FOV. This percentage FOV shift in the image domain provides for more reliable separation of the aliased signal information using parallel image reconstruction methods such as SENSE. In addition, the mitigation of phase accruals in the phase-encoding direction provides for the substantial suppression of pixel tilt and blurring in the reconstructed images.07-18-2013
20130181711Method for Performing Parallel Magnetic Resonance Imaging - A method of parallel magnetic resonance imaging of a body, comprising:—acquiring a set of elementary magnetic resonance images of said body from respective receiving antennas having known or estimated sensibility maps and noise covariance matrices, said elementary images being under-sampled in k-space; and performing regularized reconstruction of a magnetic resonance image of said body; wherein said step of performing regularized reconstruction of a magnetic resonance image is unsupervised and carried out in a discrete frame space. A method of performing dynamical and parallel magnetic resonance imaging of a body, comprising:—acquiring a set of time series of elementary magnetic resonance images of said body from respective receiving antennas having known or estimated sensibility maps and noise covariance matrices, said elementary images being under-sampled in k-space; and performing regularized reconstruction of a time series of magnetic resonance images of said body.07-18-2013
20110304329LABELED PEPTIDES AND METHODS OF USE THEREOF FOR IMPROVED OXIDATION AND MAPPING OF DISULFIDE BRIDGES - Described herein are labeled proteins and methods of use thereof for identifying the position of multiple disulfide bridges present in the peptide. The methods combine the use of diselenide bridges and NMR-based mapping of the disulfide bridges. Also described herein are labeled proteins described above that contain fluorous bridges and spacers that facilitate oxidative folding of the protein. The resulting biorthogonal oxidation strategy for studying disulfide-rich peptides both improves oxidative folding and provides simultaneous determination of the disulfide crosslink connectivity in the peptide. The methods permit routine and facile production of disulfide-rich peptides.12-15-2011
20110309831SIDE CHAIN DEUTERATED AMINO ACIDS AND METHODS OF USE - Protein structural determination using NMR techniques is improved through use of proteins in which one or more amino acids in the peptidic sequence are isotopically enriched in the sidechain with 12-22-2011
20130187650DYNAMIC B0 FIELD DETECTION BY MAGNETIC RESONANCE NAVIGATORS, AND CORRECTION FOR MULTICHANNEL RECEPTION AND/OR TRANSMISSION RF COIL CONFIGURATIONS - In a method for calculating a B07-25-2013
20130187651MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD - In one embodiment, an MRI apparatus (07-25-2013
20130187652Method for Motion Correction in Magnetic Resonance Imaging Using Radio Frequency Coil Arrays - A method for motion correction using coil arrays, termed “MOCCA,” is provided, in which coil-dependent motion-related signal variations are employed to determine information related to motion in two and three directions. With such a method, navigator echoes are not required, nor is the acquisition of additional data required to resolve complex motions in more than one direction. The motion estimation and compensation method provided by MOCCA is also applicable to applications of cardiac, respiratory, and other physiological self-gating techniques.07-25-2013
20120286779SNMR PULSE SEQUENCE PHASE CYCLING - Technologies applicable to SNMR pulse sequence phase cycling are disclosed, including SNMR acquisition apparatus and methods, SNMR processing apparatus and methods, and combinations thereof. SNMR acquisition may include transmitting two or more SNMR pulse sequences and applying a phase shift to a pulse in at least one of the pulse sequences, according to any of a variety of phase cycling techniques. SNMR processing may include combining SNMR from a plurality of pulse sequences comprising pulses of different phases, so that desired signals are preserved and undesired signals are canceled.11-15-2012
20080211498INTEGRATED SYSTEM OF MRI RF LOOP COILS PLUS SPACING FIXTURES WITH BIOCONTAINMENT USES - When scanning a patient to generate an image thereof, radio frequency (RF) coil modules are scalably coupled to each other using a plurality of clips to form flat or polygonal coil arrays that are placed on or around the patient or a portion thereof. A user assesses the volume to be imaged, identifies a coil array configuration of suitable size and shape and employs clips of one or more pre-determined angles to construct the identified coil array configuration, which is placed on or about the volume. Coil modules are coupled to a preamplifier interface box (PIB), which provides preamplified coil signal(s) to a patient imaging device, such as an MRI scanner. Small arrays are constructible to accommodate pediatric patients and/or smaller animals. Modules are hermetically sealed, can be sanitized between uses, and discarded at end-of-life. In one aspect, the modular coil array, clips, and PIB are maintained in an isolated contamination zone, separate from the patient imaging device.09-04-2008
20120019247SAR REDUCTION IN PARALLEL TRANSMISSION BY K-SPACE DEPENDENT RF PULSE SELECTION - When generating an MR image using a multi-channel transmit coil arrangement, SAR is reduced by employing a number of different RF pulses in a single scan. Each RF pulse exhibits a different performance and/or accuracy, resulting in different RF pulse-specific SAR values. As a result, the RF pulses differ slightly in actual excitation pattern, B1 waveform and/or k-space trajectory, etc. The average SAR over a single scan is thus reduced compared to a fixed RF pulse, without compromising image quality.01-26-2012
20120019246METHOD FOR MAGNETIC RESONANCE IMAGING BASED ON PARTIALLY PARALLEL ACQUISITION (PPA) - In a method and system for magnetic resonance imaging of an examination subject on the basis of partially parallel acquisition (PPA) with multiple component coils, a calibration measurement is implemented in a first time period and an actual measurement for the imaging is implemented in a subsequent second time period. In the calibration measurement, calibration data for predetermined calibration points in spatial frequency space are acquired with the multiple component coils. In the actual measurement, incomplete data sets are respectively acquired in spatial frequency space with each of the multiple component coils. Complete data sets are reconstructed from the incomplete data sets and the calibration data. The first time period and the second time period are different, and the measurements are implemented when triggered in the two time periods. An essentially identical state of the examination subject or of the measurement system is used as a trigger.01-26-2012
20120019245CEST MRI METHODS FOR IMAGING OF METABOLITES AND THE USE OF SAME AS BIOMARKERS - The CEST effect for various neurotransmitters and energy metabolites in the brain and muscles and various endogenous metabolites in the liver, brain, and myocardium are imaged using MR imaging to illustrate a unique CEST effect that may be used to monitor the concentration of the metabolite and hence to characterize and monitor various disease states in the body correlated to the concentration of that metabolite. By adjusting the timing, amplitude, and length of the RF pulse as well as other parameters of the CEST pulse sequence to address the unique chemical shifts and exchange rates of the target, new targets with unique characteristics may be acquired using CEST MR imaging.01-26-2012
20120019244COMPOSITE SPIN LOCKING PULSE SEQUENCE AND METHOD OF USING THE SAME - Present embodiments are directed towards a magnetic resonance imaging method. In one embodiment, the method includes (a) performing a first magnetic resonance imaging sequence including: (i) a first preparatory composite spin locking pulse sequence having a spin lock pulse bounded by similarly oriented spin tipping pulses; and (ii) an acquisition pulse sequence to acquire first magnetic resonance data. The method further includes (b) performing a second magnetic resonance imaging sequence including: (i) a second preparatory composite spin locking pulse sequence having a spin lock pulse bounded by oppositely oriented spin tipping pulses; and (ii) an acquisition pulse sequence to acquire second magnetic resonance data. The method also includes (c) storing the first and second magnetic resonance data.01-26-2012
20120019243REDUCTION OF SLICE SELECT ARTIFACTS IN HALF PULSE EXCITATIONS USED IN ULTRASHORT TE (UTE) IMAGING - The present embodiments are directed towards artifact reduction in slice select pulse sequences utilized in ultra short echo time imaging sequences. In one embodiment, a method includes determining a desired slice select thickness, determining a radiofrequency pulse shape and duration based upon the desired slice select thickness while maintaining a desired relationship between excitation k space and radiofrequency amplitude, and determining radiofrequency scaling based on the determined radiofrequency pulse shape and duration.01-26-2012
20130193966PHASE-SENSITIVE IMAGING OF MAGNETIZATION EXCHANGE AND ISOTOPE FLUX - A method for imaging a substrate and product over time is provided. The substrate and product are magnetically tagged with at least one magnetic gradient where magnetically tagging provides a tag-dependent signal phase for the substrate and a different tag-dependent signal phase for the product. At least one readout of magnetically tagged substrate and product is provided over time. The tag-dependent signal phase is used to determine product that has been transformed from magnetically tagged substrate and substrate that has been transformed from magnetically tagged product over time.08-01-2013
20130193967METHOD FOR TAKING DATA FROM A RESONANCE FORCE MICROSCOPY PROBE - A control apparatus for extracting data from an MRFM system in accordance with exemplary embodiments of the present invention comprising a visualization controller for controlling operation of the MRFM system, an initialization module, coupled to the visualization controller, for retrieving initialization data from a data source, a data collection module, coupled to the visualization controller, for extracting data from the MRFM system and an imaging module for generating image data based on the extracted data.08-01-2013
20130193968LOCAL COIL WITH A NUMBER OF SEPARATELY SWITCHABLE LOCAL COIL SHIM COILS - A local coil for an imaging system includes a number of shim coils. A current for generating a shim field in one of the shim coils may be switched on and switched off. A current for generating a shim field in another of the shim coils may be switched on and switched off. The currents may be switched on and switched off independently of one another for generating a respective shim field in the shim coils.08-01-2013
20130193969RELAXATION TIME ESTIMATION IN SURFACE NMR - Technologies including NMR relaxation time estimation methods and corresponding apparatus are disclosed. Example techniques may generate two or more alternating current transmit pulses with arbitrary amplitudes, time delays, and relative phases; apply a surface NMR acquisition scheme in which initial preparatory pulses, the properties of which may be fixed across a set of multiple acquisition sequence, are transmitted at the start of each acquisition sequence and are followed by one or more depth sensitive pulses, the pulse moments of which are varied across the set of multiple acquisition sequences; and apply processing techniques in which recorded NMR response data are used to estimate NMR properties and the relaxation times T08-01-2013
20130193970PROBE FOR MAGNETIC RESONANCE FORCE MICROSCOPY AND METHOD THEREOF - A probe for use in Magnetic Resonance Force Microscopy (MRFM) to provide an image of a sample comprising: a magnetic field source adapted to orient the spin of the nuclei in a sample; a detector capable of detecting a magnetic field comprising an oscillator; at least one conductor substantially surrounding the oscillator for forming a RF antenna for transmitting a radio frequency electromagnetic field; whereby the at least one conductor transmits a radio frequency electromagnetic field that influences the nuclei in the sample, and whereby the detector detects how the nuclei are influenced through the oscillations of the oscillator to provide identification information concerning the content of the sample. Also included is a method for magnetic resonance force microscopy of a sample.08-01-2013
20130099785METHOD AND MAGNETIC RESONANCE APPARATUS TO ACQUIRE MR DATA IN A PREDETERMINED THREE-DIMENSIONAL VOLUME SEGMENT OF A SUBJECT - Acquisition of magnetic resonance (MR) data in a predetermined three-dimensional volume segment of an examination subject with an MR apparatus proceeds by the volume segment being excited with an RF excitation pulse, and repeated, temporally sequential implementation of the following in order to respectively read out an echo train: 04-25-2013
20120068705MEASUREMENT DEVICE AND MEASUREMENT METHOD - A measuring instrument and a measurement method which measures, using magnetic resonance, images such as a functional image, a morphologic image of an object to be measured eliminate the influences of the moving speed of the object to be measured during moving, thereby obtaining a precise measured image. The instrument comprises: the first and second external magnetic field generation devices which generate magnetic fields for exciting the magnetic resonance of a mouse (M) as a living body to be measured; a turntable which rotates and moves the mouse (M) as an object to be measured, thereby moving the mouse (M) in the magnetic fields of the first and second external magnetic field generation devices; an OMRI measurement processing unit and an MRI measurement processing unit which obtain measured image signals within the mouse (M) by phase encoding while applying a gradient magnetic field in the moving direction (y) of the mouse (M) without stopping during the movement by the turntable; and a measured signal correction unit which corrects the measured image signal (S (k., ky)), thereby obtaining a corrected image signal (S′ (k., ky)) wherein influence of movement in y-direction is corrected.03-22-2012
20130207652System for Accelerated Magnetic Resonance Imaging Using Parallel Coils - An MR imaging system uses multiple RF coils for acquiring corresponding multiple image data sets of a slice or volume of patient anatomy. An image data processor comprises at least one processing device conditioned for, deriving a first set of weights for weighted combination of k-space data of the multiple image data sets for generating a calibration data set comprising a subset of k-space data of composite image data representing the multiple image data sets. The image data processor uses the calibration data set in generating a first MR image data set, deriving the parameters of a probability distribution in response to the first set of weights and the first MR image data set and deriving a second set of weights and second MR image data set together using the probability distribution.08-15-2013
20130207653MAGNETIC RESONANACE IMAGING APPARATUS AND METHOD FOR MEASURING IRRADIATION MAGNETIC FIELD - There is provided an MRI apparatus capable of measuring the B1 distribution of an RF transmission coil in a short time with high accuracy. In order to realize this, imaging means of the MRI apparatus includes a B1 distribution measurement sequence that includes an application of a pre-pulse by RF radiation means and a plurality of signal acquisition sequences with different elapsed time (TI) from the pre-pulse. The signal acquisition sequence uses a pulse having a small flip angle as an RF pulse and is executed before the longitudinal relaxation after the pre-pulse ends. Calculation means calculates the B1 distribution of the RF radiation means using image data with different TI acquired in the respective signal acquisition sequences.08-15-2013