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1. WO2020139476 - CORRECTING FOR HYSTERESIS IN MAGNETIC RESONANCE IMAGING

Publication Number WO/2020/139476
Publication Date 02.07.2020
International Application No. PCT/US2019/061663
International Filing Date 15.11.2019
IPC
G01R 33/389 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44-G01R33/6496
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
389Field stabilisation
G01R 33/44 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
G01R 33/565 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences
56Image enhancement or correction, e.g. subtraction or averaging techniques
565Correction of image distortions, e.g. due to magnetic field inhomogeneities
CPC
G01R 33/32
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
32Excitation or detection systems, e.g. using radio frequency signals
G01R 33/3802
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
3802Manufacture or installation of magnet assemblies; Additional hardware for transportation or installation of the magnet assembly or for providing mechanical support to components of the magnet assembly
G01R 33/3806
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
3806Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets
G01R 33/389
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
28Details of apparatus provided for in groups G01R33/44 - G01R33/64
38Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
389Field stabilisation ; , e.g. by field measurements and control means or indirectly by current stabilisation
G01R 33/445
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
445MR involving a non-standard magnetic field B0, e.g. of low magnitude as in the earth's magnetic field or in nanoTesla spectroscopy, comprising a polarizing magnetic field for pre-polarisation, B0 with a temporal variation of its magnitude or direction such as field cycling of B0 or rotation of the direction of B0, or spatially inhomogeneous B0 like in fringe-field MR or in stray-field imaging
G01R 33/543
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33Arrangements or instruments for measuring magnetic variables
20involving magnetic resonance
44using nuclear magnetic resonance [NMR]
48NMR imaging systems
54Signal processing systems, e.g. using pulse sequences ; , Generation or control of pulse sequences
543Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription
Applicants
  • HYPERFINE RESEARCH, INC. [US]/[US]
Inventors
  • O'HALLORAN, Rafael
  • HUGON, Cedric
  • SACOLICK, Laura
  • DYVORNE, Hadrien, A.
Agents
  • RUDOY, Daniel, G.
  • BAKER, C., Hunter
  • ATTISHA, Michael, J.
  • AMUNDSEN, Eric, L.
  • ALAM, Saad
Priority Data
62/786,26528.12.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CORRECTING FOR HYSTERESIS IN MAGNETIC RESONANCE IMAGING
(FR) CORRECTION D'HYSTÉRÉSIS EN IMAGERIE PAR RÉSONANCE MAGNÉTIQUE
Abstract
(EN)
An apparatus for controlling at least one gradient coil of a magnetic resonance imaging (MRI) system. The apparatus may include at least one computer hardware processor; and at least one computer-readable storage medium storing processor executable instructions that, when executed by the at least one computer hardware processor, cause the at least one computer hardware processor to perform a method. The method may include receiving information specifying at least one target pulse sequence; determining a corrected pulse sequence to control the at least one gradient coil based on the at least one target pulse sequence and a hysteresis model of induced magnetization in the MRI system caused by operation of the at least one gradient coil; and controlling, using the corrected gradient pulse sequence, the at least one gradient coil to generate one or more gradient pulses for imaging a patient.
(FR)
L'invention concerne un appareil pour la commande d'au moins une bobine de gradient d'un système d'imagerie par résonance magnétique (IRM). Le système comprend au moins un processeur matériel; et au moins un support de stockage lisible par ordinateur mémorisant des instructions pouvant être exécutées par un processeur qui, lorsqu'elles sont exécutées par ledit processeur matériel, entraîne la réalisation d'un procédé par ledit processeur Le procédé peut comprendre la réception d'information spécifiant au moins une séquence d'impulsions cible; la détermination d'une séquence d'impulsions corrigée pour commander ladite au moins une bobine de gradient sur la base de ladite au moins une séquence d'impulsions cible et d'un modèle d'hystérésis de magnétisation induite dans le système IRM entraîné par le fonctionnement de ladite au moins une bobine de gradient; et la commande, au moyen de la séquence d'impulsions de gradient corrigée, de ladite au moins une bobine de gradient pour la génération d'une ou de plusieurs impulsions de gradient pour la formation de l'image d'un patient.
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