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1. US20140197835 - Magnetic resonance imaging apparatus and magnetic resonance imaging method

Office
États-Unis d'Amérique
Numéro de la demande 14240192
Date de la demande 19.09.2012
Numéro de publication 20140197835
Date de publication 17.07.2014
Numéro de délivrance 09535146
Date de délivrance 03.01.2017
Type de publication B2
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 33/56
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
G01R 33/561
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
561par réduction du temps de balayage, c.à d. systèmes d'acquisition rapide, p.ex. utilisant des séquences d'impulsions écho-planar
CPC
G01R 33/482
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
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 33/5608
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
5608Data processing and visualization specially adapted for MR, e.g. for feature analysis and pattern recognition on the basis of measured MR data, segmentation of measured MR data, edge contour detection on the basis of measured MR data, for enhancing measured MR data in terms of signal-to-noise ratio by means of noise filtering or apodization, for enhancing measured MR data in terms of resolution by means for deblurring, windowing, zero filling, or generation of gray-scaled images, colour-coded images or images displaying vectors instead of pixels
G01R 33/5611
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
561by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
5611Parallel magnetic resonance imaging, e.g. sensitivity encoding [SENSE], simultaneous acquisition of spatial harmonics [SMASH], unaliasing by Fourier encoding of the overlaps using the temporal dimension [UNFOLD], k-t-broad-use linear acquisition speed-up technique [k-t-BLAST], k-t-SENSE
Déposants Yasuhiro Kamada
HITACHI, LTD.
Hikaru Hanada
Masahiro Takizawa
Inventeurs Yasuhiro Kamada
Hikaru Hanada
Masahiro Takizawa
Mandataires Cooper & Dunham LLP
Données relatives à la priorité 2011-214936 29.09.2011 JP
Titre
(EN) Magnetic resonance imaging apparatus and magnetic resonance imaging method
Abrégé
(EN)

In the non-Cartesian measurement, image quality is improved while the advantages of non-Cartesian measurement are maintained. To realize the aforementioned, in the non-Cartesian measurement, artifacts caused by non-uniform data density in k-space are reduced. Therefore, each unit k-space is imaged by an inverse Fourier transform, the field of view of the image is enlarged in a direction in which data density is to be increased, and the image after the enlargement of the field of view is Fourier transformed and gridded as unit k-space that has a small k-space pitch in the direction in which the field of view has been enlarged and has an increased amount of data. This processing is repeated for all blades.


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