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1. (WO2017131070) MAGNETIC FIELD ADJUSTMENT DEVICE AND MAGNETIC RESONANCE IMAGING DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2017/131070 International Application No.: PCT/JP2017/002663
Publication Date: 03.08.2017 International Filing Date: 26.01.2017
IPC:
A61B 5/055 (2006.01) ,G01R 33/02 (2006.01) ,G01R 33/035 (2006.01) ,G01R 33/20 (2006.01) ,G01R 33/3875 (2006.01) ,H01F 6/00 (2006.01) ,H01F 41/00 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
5
Measuring for diagnostic purposes; Identification of persons
05
Measuring for diagnosis by means of electric currents or magnetic fields
055
involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
02
Measuring direction or magnitude of magnetic fields or magnetic flux
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
02
Measuring direction or magnitude of magnetic fields or magnetic flux
035
using superconductive devices
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
28
Details of apparatus provided for in groups G01R33/44-G01R33/6496
38
Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
387
Compensation of inhomogeneities
3875
using correction coil assemblies, e.g. active shimming
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
F
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
6
Superconducting magnets; Superconducting coils
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
F
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
41
Apparatus or processes specially adapted for manufacturing or assembling the devices covered by this subclass
Applicants:
株式会社日立製作所 HITACHI, LTD. [JP/JP]; 東京都千代田区丸の内一丁目6番6号 6-6, Marunouchi 1-chome, Chiyoda-ku, Tokyo 1008280, JP
Inventors:
阿部 充志 ABE Mitsushi; JP
Agent:
特許業務法人磯野国際特許商標事務所 ISONO INTERNATIONAL PATENT OFFICE, P.C.; 東京都港区虎ノ門一丁目1番18号 ヒューリック虎ノ門ビル Hulic Toranomon Building, 1-18, Toranomon 1-chome, Minato-ku, Tokyo 1050001, JP
Priority Data:
2016-01292727.01.2016JP
Title (EN) MAGNETIC FIELD ADJUSTMENT DEVICE AND MAGNETIC RESONANCE IMAGING DEVICE
(FR) DISPOSITIF D’AJUSTEMENT DE CHAMP MAGNÉTIQUE ET DISPOSITIF D’IMAGERIE PAR RÉSONANCE MAGNÉTIQUE
(JA) 磁場調整装置および磁気共鳴イメージング装置
Abstract:
(EN) [Problem] To provide an operator with operability similar to that of conventional devices with an electromagnetic device that accurately maintains a magnetic field distribution by adjusting the magnetic field for each eigenmode obtained by singular value decomposition. [Solution] The strength of a unique mode is found from a measurement magnetic field, a current for each unique mode of a negative feedback control according to the magnetic field is calculated and the current is added to each mode to obtain a current for each shim coil, and a coil current is controlled so as to reach the obtained current value. In an interface for an operator, a target for a corrected magnetic field and a magnetic field generated by a shim coil are displayed using a spherical surface harmonic function strength. Due to this configuration, a device which enables accurate magnetic field adjustment while offering operability similar to conventional devices can be provided.
(FR) [Problème] Apporter à un opérateur une efficacité opérationnelle similaire à celle de dispositifs conventionnels avec un dispositif électromagnétique qui maintient précisément une distribution de champ magnétique par ajustement du champ magnétique pour chaque mode propre obtenu par décomposition de valeur singulière. [Solution] Selon la présente invention, l’intensité d’un mode unique est obtenue à partir d’un champ magnétique de mesure, un courant pour chaque mode unique d’une commande de rétroaction négative en fonction du champ magnétique est calculé et le courant est ajouté à chaque mode pour obtenir un courant pour chaque bobine de correction, et un courant de bobine est régulé de manière à atteindre la valeur de courant obtenu. Dans une interface pour un opérateur, une cible pour un champ magnétique corrigé et un champ magnétique généré par une bobine de correction sont affichés au moyen d’une intensité de fonction harmonique de surface sphérique. Grâce à cette configuration, un dispositif qui permet un ajustement de champ magnétique précis tout en apportant une efficacité opérationnelle similaire à des dispositifs conventionnels peut être fourni.
(JA) 【課題】 特異値分解により得た固有モード毎に磁場調整することで精度良く磁場分布を保つ電磁石装置で、操作者には従来機と同様な操作性を提供する。 【解決手段】 計測磁場から固有モードの強度を求め、その磁場に応じた負帰還制御の固有モード毎の電流を算出し、その電流をモード毎に加算して各シムコイルの電流を求め、その電流値になるようにコイル電流を制御する。操作者向けインターフェースでは、球面調和関数強度で補正磁場の目標やシムコイルによる磁場を表示する。そのため、従来同様の操作性でありながら精度良い磁場調整が可能となる装置を提供できる。
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)