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1. EP4266073 - PROCÉDÉ ET APPAREIL POUR RÉALISER UNE IMAGERIE PAR RÉSONANCE MAGNÉTIQUE ACCÉLÉRÉE AVEC UN EFFET DE NON-RÉSONANCE RÉDUIT

Office
Office européen des brevets (OEB)
Numéro de la demande 23169293
Date de la demande 21.04.2023
Numéro de publication 4266073
Date de publication 25.10.2023
Type de publication B1
CIB
G01R 33/48
GPHYSIQUE
01MÉTROLOGIE; TESTS
RMESURE DES VARIABLES ÉLECTRIQUES; MESURE DES VARIABLES MAGNÉTIQUES
33Dispositions ou appareils pour la mesure des grandeurs magnétiques
20faisant intervenir la résonance magnétique
44utilisant la résonance magnétique nucléaire
48Systèmes d'imagerie RMN
G01R 33/565
GPHYSIQUE
01MÉTROLOGIE; TESTS
RMESURE DES VARIABLES ÉLECTRIQUES; MESURE DES VARIABLES MAGNÉTIQUES
33Dispositions ou appareils pour la mesure des grandeurs magnétiques
20faisant intervenir la résonance magnétique
44utilisant la résonance magnétique nucléaire
48Systèmes d'imagerie RMN
54Systèmes de traitement du signal, p. ex. utilisant des séquences d'impulsions
56Amélioration ou correction de l'image, p. ex. par des techniques de soustraction ou d'établissement de moyenne
565Correction de distorsions d'image, p. ex. dues à des inhomogénéités de champ magnétique
CPC
G01R 33/4824
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
4818MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
4824using a non-Cartesian trajectory
G01R 33/4826
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
4818MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
4824using a non-Cartesian trajectory
4826in three dimensions
G01R 33/56563
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
56Image enhancement or correction, e.g. subtraction or averaging techniques ; , e.g. improvement of signal-to-noise ratio and resolution
565Correction of image distortions, e.g. due to magnetic field inhomogeneities
56563caused by a distortion of the main magnetic field B0, e.g. temporal variation of the magnitude or spatial inhomogeneity of B0
G01R 33/56536
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
56Image enhancement or correction, e.g. subtraction or averaging techniques ; , e.g. improvement of signal-to-noise ratio and resolution
565Correction of image distortions, e.g. due to magnetic field inhomogeneities
56536due to magnetic susceptibility variations
G01R 33/385
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
385using gradient magnetic field coils
G01R 33/4822
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
4818MR characterised by data acquisition along a specific k-space trajectory or by the temporal order of k-space coverage, e.g. centric or segmented coverage of k-space
482using a Cartesian trajectory
4822in three dimensions
Déposants COMMISSARIAT ENERGIE ATOMIQUE
SIEMENS HEALTHCARE SAS
Inventeurs GILIYAR RADHAKRISHNA CHAITHYA
DAVAL FREROT GUILLAUME
VIGNAUD ALEXANDRE
CIUCIU PHILIPPE
États désignés
Données relatives à la priorité 22305592 21.04.2022 EP
Titre
(DE) VERFAHREN UND VORRICHTUNG ZUR DURCHFÜHRUNG BESCHLEUNIGTER MAGNETRESONANZBILDGEBUNG MIT REDUZIERTEM OFF-RESONANZEFFEKT
(EN) METHOD AND APPARATUS FOR PERFORMING ACCELERATED MAGNETIC RESONANCE IMAGING WITH REDUCED OFF-RESONANCE EFFECT
(FR) PROCÉDÉ ET APPAREIL POUR RÉALISER UNE IMAGERIE PAR RÉSONANCE MAGNÉTIQUE ACCÉLÉRÉE AVEC UN EFFET DE NON-RÉSONANCE RÉDUIT
Abrégé
(EN) A method of performing magnetic resonance imaging of a body using a magnetic resonance imaging scanner the method comprising applying to said body a time-varying magnetic field gradient (Gx, Gy, Gz) defining a continuous trajectory (ST) in k-space complying with a set of constraints including constraints on maximum amplitude and maximum slew rate of said time-varying magnetic field gradient, such that sampling points (KS) belonging to the trajectory define a pseudo-random sampling of the k-space, approximating a predetermined target sampling density, said trajectory in k-space minimizing, subject to said set of constraints, a cost function defined by the difference between a first term, called attraction term, promoting consistency of the distribution of sampling points in k-space with said predetermined target sampling density, and a second term, called repulsion term, promoting separation in k-space between sampling points, said repulsion term being expressed as a sum of contributions corresponding to respective pairs of sampling points;characterized in that each said contribution is weighted by a weight which increase with temporal separation of the sampling points along said trajectory in k-space.
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