Class / Patent application number | Description | Number of patent applications / Date published |
324312000 | By spectrum storage and analysis | 22 |
20080204020 | Method 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. | 08-28-2008 |
20080246477 | Magnetic resonance imaging apparatus, RF coil system, and magnetic resonance imaging method - A magnetic resonance imaging apparatus has at least one RF coil and a data processing control unit. The RF coil that generates unique information, receives a nuclear magnetic resonance signal, and wirelessly transmits the received nuclear magnetic resonance signal and the unique information. The data processing control unit receives the wirelessly transmitted nuclear magnetic resonance signal and the unique information, and generates image data based on the nuclear magnetic resonance signal in accordance with the unique information. | 10-09-2008 |
20080258727 | METHOD FOR PRODUCING A MAGNETIC RESONANCE IMAGE USING AN ULTRA-SHORT ECHO 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. | 10-23-2008 |
20080265885 | Magnetic Resonance Imaging with Short Echo Times - In a magnetic resonance imaging method, inner radial readout lines ( | 10-30-2008 |
20080272781 | Q-SPACE SAMPLING METHOD AND DIFFUSION SPECTRUM IMAGING METHOD EMPLOYING THE SAME - A q-space sampling method includes: (a) receiving a required sampling number and a range of sampling region in q-space set by a user; (b) obtaining a sampling interval by iteration using a regular non-rectangular sampling lattice when an actual sampling number converges to the required sampling number; and (c) obtaining positions of sampling data in q-space based on the sampling interval and the regular non-rectangular sampling lattice. A diffusion spectrum imaging method using the q-space sampling method is also disclosed. | 11-06-2008 |
20080272782 | SUPPRESSION OF NOISE IN MR IMAGES AND MR SPECTROSCOPIC IMAGES USING SIGNAL SPACE PROJECTION FILTERING - A method for suppressing the noise component of a measured magnetic resonance (MR) signal is disclosed. In particular, a signal-space projection operator is produced and employed to suppress the noise component from acquired MR signals that is uncorrelated with the spatial pattern of a desired NMR signal. In one embodiment, an fMRI scan is performed to acquire time course image data. The NMR data is filtered with a signal-space projection operator and reconstructed into a series of image frames. In another embodiment, the signal-space projection operator is employed to suppress lipid signal in MRS image data. | 11-06-2008 |
20080278165 | Method and apparatus for reconstruction of an image in image space using basis functions (RIB) for partially parallel imaging - Embodiments of the invention pertain to a method and apparatus for image reconstruction for parallel Magnetic Resonance Imaging (MRI). In a specific embodiment, a method for image reconstruction in image space is provided. The method can suppress aliasing caused by undersampling when the number of sampling lines in k-space is reduced to increase the imaging speed. In an embodiment, suppressing aliasing from under-sampling can improve the quality of images reconstructed from the data acquired using a MRI coil array. In an embodiment, the method operates in image space and achieves a good resolution. In the reconstruction, the sum of square errors can be minimized within a region of interest, which can allow the image reconstruction to be optimized in a particular imaging region of interest by sacrificing the reconstruction of other regions. In a further embodiment, image reconstruction can be implemented region by region, allowing global optimization by spending a longer time in reconstruction. | 11-13-2008 |
20080303521 | SYSTEM AND METHOD FOR ACCELERATED MAGNETIC RESONANCE PARALLEL IMAGING - A system and method for MR imaging includes the use of a form of autocalibrated parallel imaging. By combining a segmented, rotated acquisition trajectory with autocalibration parallel imaging (API), the system and method can achieve improved motion insensitivity while maintaining the benefits of accelerated acquisition due to parallel imaging. In various embodiments, calibration values from a set of reference data or from another set of imaging data can be used in determining reconstruction weights for a given k-space data set. Thus, separate calibration data need not necessarily be acquired for each set of imaging data. | 12-11-2008 |
20080309337 | NMR CHARACTERIZATION OF THIN FILMS - A method, apparatus, and system for characterizing thin film materials. The method, apparatus, and system includes a container for receiving a starting material, applying a gravitational force, a magnetic force, and an electric force or combinations thereof to at least the starting material, forming a thin film material, sensing an NMR signal from the thin film material and analyzing the NMR signal to characterize the thin film of material. | 12-18-2008 |
20090219023 | Method of and Software Application for Quantifying Objects in Magnetic Resonance Images via Multiple Complex Summations - A method comprises digitally representing a volume of space as a plurality of voxels and assigning real and imaginary values derived from magnetic resonance imaging data of the space to each of the voxels. Furthermore, the method comprises a steps of calculating a first complex summation of the real and imaginary values of a first set of the voxels, and calculating a second complex summation of the real and imaginary values of a second set of the voxels. Each set of voxels represents a different region of the volume of space. The regions are concentric. The method also comprises steps of using the first and second summations, along with another value quantitatively calculated from the magnetic resonance imaging data, to calculate a value that is dependent upon the approximate magnetic moment of an object within the volume of space, and digitally representing and storing said value. | 09-03-2009 |
20090256567 | THREE-POINT METHOD AND SYSTEM FOR FAST AND ROBUST FIELD MAPPING FOR EPI GEOMETRIC DISTORTION CORRECTION - A system and method for MR magnetic field mapping includes a computer programmed to acquire a first data point at a first location in a first phase image data set, a second data point at the first location in a second phase image data set, a third data point at the first location in a third phase image data set. The first, second, and third phase images are acquired using a first, second, and third TE, respectively. Phase wrapping does not occur among the first and second phase image data sets; however, phase wrapping does occur among the second and third phase image data sets. The computer is also programmed to determine a magnetic field inhomogeneity, wherein the determination of the magnetic field inhomogeneity is based on the first, second, and third data points. | 10-15-2009 |
20090256568 | SYSTEM AND METHOD FOR CORRECTING FLOW VELOCITY MEASUREMENTS IN PHASE CONTRAST IMAGING USING MAGNETIC FIELD MONITORING - A system and method of phase contrast imaging includes a system control programmed to acquire a first set of data and a second set of data via the RF coil assembly during a scan and acquire a third set of data and a fourth set of data via the plurality of magnetic field monitoring devices during the scan. A first single data set from the first and third sets of data is formed, and a second single data set from the second and fourth sets of data is formed. The system control is also programmed to reconstruct a phase contrast image based on the first and second single data sets to correct for spatially-dependent background phase variations. | 10-15-2009 |
20090278539 | SYSTEM AND METHOD FOR USING PARALLEL IMAGING WITH COMPRESSED SENSING - A system and method for combining parallel imaging and compressed sensing techniques to reconstruct an MR image includes a computer programmed to acquire undersampled MR data for a plurality of k-space locations that is less than an entirety of a k-space grid. The computer is further programmed to synthesize unacquired MR data by way of a parallel imaging technique for a portion of k-space location at which MR data was not acquired and apply a compressed sensing reconstruction technique to generate a reconstructed image from the acquired undersampled MR data and the synthesized unacquired data. | 11-12-2009 |
20100308828 | SYSTEM AND METHOD FOR RECONSTRUCTING MULTI-SPECTRAL 3D MR IMAGES - An apparatus and method for reconstructing multi-spectral 3D MR images includes a magnetic resonance (MRI) apparatus that includes an 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. The MRI apparatus also includes a computer programmed to acquire a plurality of three-dimensional (3D) MR data sets, wherein each 3D MR data set is acquired using a central transmit and receive frequency set to an offset frequency value that is distinct for each 3D MR data set. The computer is also programmed to simultaneously generate a composite image and a magnetic field map based on the plurality of 3D MR data sets. | 12-09-2010 |
20110095762 | METHOD AND DEVICE FOR RADIAL DATA ACQUISITION IN THREE-DIMENSIONAL K-SPACE IN AN MR MEASUREMENT FOR A MAGNETIC RESONANCE SYSTEM - For radial data acquisition in three-dimensional k-space in an MR measurement for a magnetic resonance system, data in k-space are acquired along straight-line spokes. Each of the spokes is thereby defined by a point on a sphere and the center point of this sphere, wherein the center point corresponding to the center of k-space. The points are arranged on the sphere such that a distribution of the points obeys the spiral phyllotaxis, in particular the Fibonacci phyllotaxis. | 04-28-2011 |
20120223713 | METHOD AND MAGNETIC RESONANCE SYSTEM TO AUTOMATICALLY DETERMINE PARAMETERS OF A FLOW MEASUREMENT - In a method and a magnetic resonance system to automatically determine parameters of a phase contrast flow measurement, a phase contrast pre-measurement with a flow coding sequence is implemented in a predetermined volume segment of an examination subject, and the flow coding sequence is varied in terms of its parameters so that a pre-measurement is respectively implemented for multiple different parameter sets of the flow coding sequence. A model is automatically determined with which a dimension of a phase error can be determined for each parameter set in the flow measurement, in that phase values of the pre-measurement which is implemented with the flow coding sequence with the respective parameter set are analyzed. Those parameters of the flow measurement at which the dimension of the phase error is smallest are automatically determined. | 09-06-2012 |
20130207654 | MAGNETIC RESONANCE IMAGING APPARATUS, METHOD FOR CORRECTING MEASUREMENT-SPACE COORDINATES, AND IMAGE RECONSTRUCTION METHOD - In order to approximate the gradient magnetic field pulse waveform shape with high accuracy and improve the image quality at the time of imaging cross-section change or oblique imaging, an MRI apparatus of the present invention divides the waveform shape of the gradient magnetic field pulse into a plurality of sections, defines an approximation function for each section, and corrects the k-space coordinates at which the echo signal is arranged using the parameter of the approximation function. In addition, an optimal parameter of the approximation function of the waveform shape of the gradient magnetic field pulse is searched for using the measured signal. | 08-15-2013 |
20140002082 | MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD | 01-02-2014 |
20140035582 | MAGNETIC RESONANCE IMAGING OF OBJECT IN MOTION - A magnetic resonance imaging method includes acquisition of datasets of magnetic resonance data from an object. At least some of the datasets are undersampled in k-space. Each dataset relating to a motion state of the object. Images are reconstructed from each of the datasets by way of a compressed sensing reconstruction. Motion correction is applied to the reconstructed images relative to a selected motion state, so as to generate motion corrected images. A diagnostic image for the selected motion state is derived, e.g. by averaging from the motion corrected images. | 02-06-2014 |
20140097840 | METHOD AND MAGNETIC RESONANCE APPARATUS FOR IMAGE ACQUISITION - A method and magnetic resonance apparatus for image acquisition using a magnetic resonance sequence (in particular a PETRA sequence) in which k-space corresponding to the imaging area is scanned, with a first region of k-space, which does not include the center of k-space, being scanned radially along a number of spokes emanating from the center of k-space, and with at least two phase coding gradients being completely ramped up before administration of the excitation pulse, and a second central region of k-space, which remains without the first region, is scanned in a Cartesian manner (in particular via single point imaging). For the purpose of a contrast increase a pre-pulse—in particular an inversion pulse to establish a T1 contrast—is provided before a predetermined number of individual measurements. The number of spokes to be measured is selected such that a measurement point located (in a Cartesian manner) nearest to the center of k-space is measured at a predetermined point in time after a pre-pulse, which point in time is optimal with regard to the signal-to-noise ratio and/or the contrast. | 04-10-2014 |
20140139216 | METHOD AND SYSTEM FOR A UNIVERSAL NMR/MRI CONSOLE - A method and system are provided for providing values for control signals for a pulsed magnetic resonance spectrometer such as an NMR spectrometer or an MRI apparatus. The AC output(s) corresponding to a particular signal (e.g. a magnetization or gradient pulse or pulse sequence) originating from a source spectrometer is measured and stored by an independent control unit. The digital output of the independent control unit is then connected to the digital input of the control electronics of a target pulsed magnetic resonance spectrometer, the value of the digital output varied until the AC output(s) of the appropriate signal source of the target spectrometer matches that of the corresponding output(s) of the source spectrometer, corrected, if necessary, for differences in magnetic field strengths. | 05-22-2014 |
20160052946 | NOVEL PHOSPHATIDYLALKANOLS AND COMPOSITIONS THEREOF - The present invention discloses a composition comprising a compound of formula I and a deuterated solvent. The deuterated solvent is miscible with water in any proportion at a temperature of 20 to 25° C. and comprises less than 5% residual | 02-25-2016 |