Patent application number | Description | Published |
20080211498 | INTEGRATED 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 |
20080265885 | Magnetic Resonance Imaging with Short Echo Times - In a magnetic resonance imaging method, inner radial readout lines ( | 10-30-2008 |
20080310695 | Locally Adaptive Nonlinear Noise Reduction - An imaging scanner ( | 12-18-2008 |
20090116761 | Method of Motion Correction for Dynamic Volume Alignment Without Timing Restrictions - When performing repetitive scans of a patient using a magnetic resonance imaging machine or the like, patients often tend to move as they relax during a lengthy scanning session, causing movement in the volume or portion of the patient being scanned. A prospective motion correction component ( | 05-07-2009 |
20090128152 | SIMULTANEOUS MRI IMAGING OF MULTIPLE SUBJECTS - A magnetic resonance scanner includes a main magnet ( | 05-21-2009 |
20090140734 | READOUT ORDERING IN COLLECTION OF RADIAL MAGNETIC RESONANCE IMAGING DATA - In a magnetic resonance imaging apparatus, a sensor ( | 06-04-2009 |
20100239142 | B1 mapping in MRI system using k-space spatial frequency domain filtering - Frequency filtering of spatially modulated or “tagged” MRI data in the spatial frequency k-space domain with subsequent 2DFT to the spatial domain and pixel-by-pixel arithmetic calculations provide robust ratio values that can be subjected to inverse trigonometric functions to derive B1 maps for an MRI system. | 09-23-2010 |
20100239151 | B1 and/or B0 mapping in MRI system using k-space spatial frequency domain filtering - Frequency filtering of spatially modulated or “tagged” MRI data in the spatial frequency k-space domain with subsequent 2DFT to the spatial domain and pixel-by-pixel arithmetic calculations provide robust data that can be used to derive B1 and/or B0 maps for an MRI system. | 09-23-2010 |
20110181282 | Method 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 |
20120032676 | Spatial 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 |
20120032677 | SPATIAL 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 |
20120293171 | PULSED 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 |
20120293172 | SPATIALLY 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 |
20140232393 | MAPPING EDDY CURRENT FIELDS IN MRI SYSTEM - Eddy current fields in a magnetic resonance imaging (MRI) system are mapped by acquiring MRI data from an object located in an imaging volume of the MRI system. An MRI data acquisition sequence is preceded by a pre-sequence including (a) a gradient magnetic field transition that stimulates eddy current fields in the MRI system, and (b) a spatial modulation grid tag module that sensitizes a spatially resolved MR image of the acquired MRI data to the stimulated eddy current fields that existed during the spatial modulation grid tag module. The eddy-sensitized MR image is processed to calculate a spatially resolved map of fields produced by the eddy currents. | 08-21-2014 |
20140361770 | PARALLEL MRI WITH SPATIALLY MISREGISTERED SIGNAL - A magnetic resonance imaging (MRI) system, method and/or computer readable medium is configured to effect improved parallel MR imaging with reduced unfolding artifacts by using either or both of:
| 12-11-2014 |
20150061668 | MRI GHOSTING CORRECTION USING UNEQUAL MAGNITUDES RATIO - A magnetic resonance imaging (MRI) system, method and/or computer readable medium is configured to effect MR imaging with reduced ghosting artifacts by operations including determining spatially varying signal magnitude differences associated with first and second parts of a reference MR data, and reconstructing a diagnostic image based upon a first and a second parts of main scan data and the determined spatially varying signal magnitude differences. The first parts of the reference data and main scan data is acquired using a first readout gradient, and the second parts of the reference data and main scan data is acquired using a second readout gradient that is different from the first readout gradient. | 03-05-2015 |