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1. WO2014121991 - ACTIVE COMPENSATION FOR FIELD DISTORTING COMPONENTS IN A MAGNETIC RESONANCE IMAGING SYSTEM WITH A GANTRY

Publication Number WO/2014/121991
Publication Date 14.08.2014
International Application No. PCT/EP2014/050743
International Filing Date 16.01.2014
IPC
G01R 33/3875 2006.1
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
387Compensation of inhomogeneities
3875using correction coil assemblies, e.g. active shimming
G01R 33/389 2006.1
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 33/48 2006.1
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
CPC
A61B 5/0555
A61N 2005/1055
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
5Radiation therapy
10X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
1048Monitoring, verifying, controlling systems and methods
1049for verifying the position of the patient with respect to the radiation beam
1055using magnetic resonance imaging [MRI]
A61N 5/1039
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
5Radiation therapy
10X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
103Treatment planning systems
1039using functional images, e.g. PET or MRI
G01R 33/307
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
30Sample handling arrangements, e.g. sample cells, spinning mechanisms
307specially adapted for moving the sample relative to the MR system, e.g. spinning mechanisms, flow cells or means for positioning the sample inside a spectrometer
G01R 33/3875
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
387Compensation of inhomogeneities
3875using correction coil assemblies, e.g. active shimming
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
Applicants
  • KONINKLIJKE PHILIPS N.V. [NL]/[NL] (AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BE, BF, BG, BH, BJ, BN, BR, BW, BY, BZ, CA, CF, CG, CH, CI, CL, CM, CN, CO, CR, CU, CY, CZ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, FR, GA, GB, GD, GE, GH, GM, GN, GQ, GR, GT, GW, HN, HR, HU, ID, IE, IL, IN, IR, IS, IT, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MC, MD, ME, MG, MK, ML, MN, MR, MT, MW, MX, MY, MZ, NA, NE, NG, NI, NL, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SI, SK, SL, SM, SN, ST, SV, SY, SZ, TD, TG, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW)
  • PHILIPS GMBH [DE]/[DE] (DE)
Inventors
  • OVERWEG, Johannes Adrianus
  • UHLEMANN, Falk
Agents
  • COHEN, Julius, S.
Priority Data
13154203.706.02.2013EP
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) ACTIVE COMPENSATION FOR FIELD DISTORTING COMPONENTS IN A MAGNETIC RESONANCE IMAGING SYSTEM WITH A GANTRY
(FR) COMPENSATION ACTIVE DES COMPOSANTS DE DÉFORMATION DE CHAMP DANS UN SYSTÈME D'IMAGERIE PAR RÉSONANCE MAGNÉTIQUE À PORTIQUE
Abstract
(EN) The invention provides for a medical apparatus (300, 400, 500) comprising: a magnetic resonance imaging system (306); magnetic compensation coils (334, 335) for compensating for magnetic inhomogeneities within the imaging zone; a gantry (308) operable for rotating about the imaging zone; a position sensor (312) for measuring the angular position and the angular velocity of the gantry; at least one magnetic field distorting component (310, 510, 512) in the gantry, a memory (362) storing machine executable instructions (380, 382, 410, 530, 532) and field correction data (372). The instructions cause a processor to: receive (100, 200) the position and angular velocity data from the position sensor; determine (102, 202) coil control commands (374) for controlling the magnetic compensation coils using the field correction data, the position data and the angular velocity data; control (104, 204) the magnetic compensation coils to compensate for magnetic inhomogeneities within the imaging zone using the coil control commands; and acquire (106, 212) the magnetic resonance data.
(FR) La présente invention concerne un appareil médical (300, 400, 500) comprenant : un système d'imagerie par résonance magnétique (306); des bobines de compensation magnétique (334, 335) servant à compenser les inhomogénéités magnétiques au sein de la zone d'imagerie; un portique (308) conçu pour tourner autour de la zone d'imagerie; un capteur de position (312) servant à mesurer la position angulaire et la vitesse angulaire du portique; au moins un composant de déformation de champ magnétique (310, 510, 512) dans le portique, une mémoire (362) stockant des instructions (380, 382, 410, 530, 532) exécutables par une machine et des données de correction de champ (372). Les instructions amènent un processeur à : recevoir (100, 200) les données de position et de vitesse angulaire provenant du capteur de position; déterminer (102, 202) des ordres de commande de bobine (374) servant à commander les bobines de compensation magnétique au moyen des données de correction de champ, des données de position et des données de vitesse angulaire; commander (104, 204) les bobines de compensation magnétique pour compenser les inhomogénéités magnétiques au sein de la zone d'imagerie au moyen des ordres de commande de bobine; et acquérir (106, 212) les données de résonance magnétique.
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