Patent application number | Description | Published |
20080262339 | Magnetic Resonance Imaging of Amyloid Plaque in the Brain - Amyloid plaque in the brain of a subject is imaged in an MRI system with or without the use of a contrast agent. Contrast is achieved using a spin-echo pulse sequence that is both respiratory gated and cardiac gated to reduce motion artifacts at the very high image resolution required to see plaque. A preparatory pulse sequence is used to insure longitudinal magnetization remains constant for all the acquired views even if the effective TR changes during the scan due to irregular breathing. | 10-23-2008 |
20090257634 | RF pulse distortion correction - This document discloses, among other things, a method for removing a bullseye artifact from a radial image generated using magnetic resonance and using a swept frequency pulse. | 10-15-2009 |
20090264733 | MRI CONTRAST USING HIGH TRANSVERSE RELAXATION RATE CONTRAST AGENT - This document discloses, among other things, a system and method of creating a positive contrast magnetic resonance imaging (MRI) feature using a high transverse relaxation rate contrast agent. | 10-22-2009 |
20100237866 | MAGNETIC 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 |
20100253340 | ADIABATIC 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 |
20100253341 | PULSE 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 |
20100287887 | TISSUE MARKER FOR MULTIMODALITY RADIOGRAPHIC IMAGING - An implantable tissue marker incorporates a contrast agent sealed within a chamber in a container formed from a solid material. The contrast agent is selected to produce a change, such as an increase, in signal intensity under magnetic resonance imaging (MRI). An additional contrast agent may also be sealed within the chamber to provide visibility under another imaging modality, such as computed tomographic (CT) imaging or ultrasound imaging. | 11-18-2010 |
20110068790 | 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. | 03-24-2011 |
20110116696 | DIPOLE MATCHED FILTER FOR MRI - A method includes receiving k-space data corresponding to magnetic resonance data for a subject and selecting a template for analysis. In addition, the method includes generating an image using the k-space data and using the template. | 05-19-2011 |
20110288398 | SHORT TE 3D RADIAL SAMPLING SEQUENCE FOR MRI - A method for magnetic resonance imaging includes providing a radio frequency excitation pulse to a specimen. The pulse has a duration. The method includes, concurrent with providing the radio frequency excitation pulse, applying a first gradient having a first polarity. The method includes applying a readout gradient at a time after the duration. The readout gradient has inverse polarity relative to the first polarity. The method includes, concurrent with applying the readout gradient, acquiring magnetic resonance data from the specimen. The method includes generating an image based on the magnetic resonance data. | 11-24-2011 |
20120092010 | LOCALISATION 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 |
20120286780 | MAGNETIC 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 |
20130043867 | SIDEBAND 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 |
20130069649 | MAGNETIZATION 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 |
20130084023 | MULTISTEP CORRECTION FOR ANGLE CONSISTENT ARTIFACTS IN RADIAL SAMPLED DATASETS - This document discloses, among other things, a method for removing a bullseye artifact from a radial image generated using magnetic resonance and using a swept frequency pulse. | 04-04-2013 |
20130085374 | METHOD OF OSCILLOGRAM FILTERING FOR RADIAL MRI DATA - A system includes a data receiver, a sinogram generator, a processor, a filter module, and an output module. The data receiver is configured to receive radial ordered magnetic resonance data. The sinogram generator is configured to generate a first sinogram corresponding to a view angle as a function of a readout direction for the magnetic resonance data. The processor is configured to generate an oscillogram having an angular frequency axis. The oscillogram corresponds to a Fourier transform of the first sinogram. The filter module is configured to selectively filter a peak in a projection formed along a selected axis of the oscillogram, the peak being related to an interference signal such as an RF interference. The selected axis is orthogonal to the angular frequency axis. The output module is configured to form a second sinogram corresponding to a transform of the filtered projection | 04-04-2013 |
20130271133 | STEERING RESONANCE ALONG A TRAJECTORY - A method for generating a magnetic resonance image includes applying a radio frequency (RF) pulse to a specimen. The method includes modulating a spatially varying magnetic field to impart an angular velocity to a trajectory of a region of resonance relative to the specimen. The method includes acquiring data corresponding to the region of resonance and reconstructing a representation of the specimen based on the data. | 10-17-2013 |
20130320980 | PULSE 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. | 12-05-2013 |
20140187911 | TISSUE MARKER FOR MULTIMODALITY RADIOGRAPHIC IMAGING - An implantable tissue marker incorporates a contrast agent scaled within a chamber in a container formed from a solid material. The contrast agent is selected to produce a change, such as an increase, in signal intensity under magnetic resonance imaging (MRI). An additional contrast agent may also be sealed within the chamber to provide visibility under another imaging modality, such as computed tomographic (CT) imaging or ultrasound imaging. | 07-03-2014 |
20140218028 | BEAM STEERING WITH RESONANCE ALONG A TRAJECTORY - A method for generating a magnetic resonance image includes configuring a magnetic field to correspond to a trajectory within a region of interest. The method includes applying RF excitation to spatially control a region of magnetic resonance corresponding to the trajectory. The method includes modulating the magnetic field coincident with the spatially controlled region of magnetic resonance. The method includes acquiring data corresponding to the region of magnetic resonance and generating an image based on the data. | 08-07-2014 |