Patent application number | Description | Published |
20080197842 | K-T SPARSE: HIGH FRAME-RATE DYNAMIC MAGNETIC RESONANCE IMAGING EXPLOITING SPATIO-TEMPORAL SPARSITY - A method of dynamic resonance imaging is provided. A magnetic resonance imaging excitation is applied. Data in 2 or 3 spatial frequency dimensions, and time is acquired, where an acquisition order in at least one spatial frequency dimension and the time dimension are in a pseudo-random order. The pseudo-random order and enforced sparsity constraints are used to reconstruct a time series of dynamic magnetic resonance images. | 08-21-2008 |
20090058418 | DOUBLE 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 T | 03-05-2009 |
20090069664 | METHOD FOR DETERMINING TIME-OPTIMAL GRADIENT WAVEFORMS - A method for magnetic resonance imaging (MRI) is provided. A scanning path is specified. Gradient amplitude is determined as a function of arc-length along the scanning path in k-space. A time optimal gradient waveform for scanning the scanning path is calculated from the gradient amplitude. The scanning path is scanned using the time optimal gradient waveform. | 03-12-2009 |
20090091321 | SELF NAVIGATING CARTESIAN TRAJECTORY - A method for magnetic resonance imaging (MRI) is provided. A magnetic resonance excitation is provided. A magnetic field is read out through k-space using winders, wherein some of the winders overlap for a length of the winders. Readout data from overlapping lengths of winders is used to estimate motion. The readout may use a two dimensional discrete Fourier transform acquisition. | 04-09-2009 |
20090196478 | AUTO CALIBRATION PARALLEL IMAGING RECONSTRUCTION METHOD FROM ARBITRARY K-SPACE SAMPLING - A method for obtaining an image by parallel acquisition magnetic resonance imaging (MRI) is provided. Precessing nuclear spins are excited in a region of a subject. A plurality of response signals, representing magnetic resonance signals arising from the precessing nuclear spins, are simultaneously obtained from the region respectively with a plurality of RF reception coils, with each response signal representing a reduced data set of a totality of all of said response signals. Calibration data points are additionally obtained for each data set. A filter is synthesized using the calibration data points. The synthesizing filter is applied to the reduced data set to obtain a plurality of coupled simultaneous linear equations with a plurality of unknowns. The plurality of coupled simultaneously linear equations with the plurality of unknowns is solved to obtain a complete data set. | 08-06-2009 |
20090315558 | SELF-REFOCUSED SPATIAL-SPECTRAL PULSE - A method for frequency selective and slice selective magnetic resonance imaging (MRI) is provided. A B | 12-24-2009 |
20100026294 | BLIP DESIGN FOR RANDOM SAMPLING COMPRESSED SENSING OF FLYBACK 3D-MRSI - A method of providing a magnetic resonance spectral image (MRSI) is provided. A magnetic resonance imaging excitation is applied. Data is acquired, comprising applying an oscillating gradient in a first dimension and applying blips in at least a second dimension in a pseudo-random order to acquire pseudo-random temporally undersampled spectral data in at least two planes. The pseudo-random order is used to reconstruct a magnetic resonance spectral image in at least two dimensions. | 02-04-2010 |
20100033179 | DISTORTION-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 |
20100085046 | HYPERPOLARIZED DYNAMIC CHEMICAL SHIFT IMAGING WITH TAILORED MULTIBAND EXCITATION PULSES - A method for performing magnetic resonance spectroscopy is described. The method generally includes applying a tailored multiband spectral-spatial radio frequency excitation pulse to a sample including a first species and at least a second species having a different resonant frequency than the first species. The multiband excitation pulse excites the first species according to a first amplitude and excites the second species according to a second amplitude that is substantially greater than the first amplitude. Data is acquired from the sample. The acquired data is then utilized to generate a spectroscopic output. By way of example, the spectroscopic output is a spectroscopic image. In particular embodiments, the data for the first and second species is acquired dynamically over an observation window of time. | 04-08-2010 |
20100102812 | OPTIMIZED 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 k | 04-29-2010 |
20100325185 | ALGORITHM FOR ADIABATIC PULSE DESIGN USING THE SHINNAR LE-ROUX TRANSFORM - A method for providing an adiabatic RF pulse that is an inversion or refocusing pulse for a RF pulse sequence is provided. A linear phase frequency profile (F | 12-23-2010 |
20120092009 | AUTOCALIBRATING 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 |
20130044960 | COIL COMPRESSION FOR THREE DIMENSIONAL AUTOCALIBRATING PARALLEL IMAGING WITH CARTESIAN SAMPLING - A three dimensional image, in a phased array magnetic resonance imaging (MRI) system is provided. Three dimensional k-space data within an auto calibration signal (ACS) region and outside the ACS region are acquired. The k-space data within the ACS region are converted into hybrid space ACS data. Compression matrices and alignment matrices of the compression matrices for the hybrid space ACS data are found along a readout direction. Alignment matrices are multiplied to the compression matrices to achieve the properly-aligned compression matrices along the readout direction. All k-space data are converted into hybrid space. The properly-aligned compression matrices are applied to the hybrid space data to provide compressed data with fewer channels. The compressed data are used to form a three dimensional image. | 02-21-2013 |
20130193966 | PHASE-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 |
20140210469 | NONRIGID MOTION CORRECTION IN 3D USING AUTOFOCUSING WITH LOCALIZED LINEAR TRANSLATIONS - A method for providing an magnetic resonance imaging (MRI) with nonrigid motion correction of an object is provided. An MRI excitation is applied to the object. A magnetic field read out from the object using a plurality of sensor coils. Spatially localized motion estimates are obtained for each sensor coil of the plurality of sensor coils. The motion estimates are used for each sensor coil to provide motion correction. | 07-31-2014 |
20150042329 | DYNAMIC CONTRAST ENHANCED MAGNETIC RESONANCE IMAGING WITH HIGH SPATIAL-TEMPORAL RESOLUTION - A method of providing dynamic magnetic resonance imaging (MRI) of an object in an MRI system is provided. A magnetic resonance excitation from the MRI system is applied to the object. A magnetic resonance signal is read out through k-space for a plurality of regions with two or three spatial dimensions and a temporal dimension, wherein the read out is pseudo-randomly undersampled in the spatial frequency dimensions and the temporal dimension providing k-space data that is pseudo-randomly undersampled in the spatial frequency dimensions and the temporal dimension. The readout data is used to create a sequential series of spatial frequency data sets by generating interpolated data in the spatial frequency dimensions and the temporal dimension. The sequential series of spatial frequency data sets is used to create temporally resolved spatial images. | 02-12-2015 |