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1. WO2013002231 - 磁気共鳴イメージング装置および高周波磁場決定方法

公開番号 WO/2013/002231
公開日 03.01.2013
国際出願番号 PCT/JP2012/066314
国際出願日 27.06.2012
IPC
A61B 5/055 2006.01
A生活必需品
61医学または獣医学;衛生学
B診断;手術;個人識別
5診断のための検出,測定または記録;個体の識別
05電流または磁場による診断のための測定
055電子または核の磁気共鳴を含むもの,例.磁気共鳴イメージング
CPC
A61B 5/055
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Detecting, measuring or recording for diagnostic purposes
05Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; ; Measuring using microwaves or radiowaves
055involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
G01R 33/288
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
288Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room
G01R 33/54
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
G01R 33/56518
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
56518due to eddy currents, e.g. caused by switching of the gradient magnetic field
G01R 33/56572
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
56572caused by a distortion of a gradient magnetic field, e.g. non-linearity of a gradient magnetic field
G01R 33/583
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
58Calibration of imaging systems, e.g. using test probes ; , Phantoms; Calibration objects or fiducial markers such as active or passive RF coils surrounding an MR active material
583Calibration of signal excitation or detection systems, e.g. for optimal RF excitation power or frequency
出願人
  • 株式会社 日立メディコ HITACHI MEDICAL CORPORATION [JP]/[JP] (AllExceptUS)
  • 呉 彬▲栄▼ WU,Binrong [JP]/[JP] (UsOnly)
発明者
  • 呉 彬▲栄▼ WU,Binrong
優先権情報
2011-14665130.06.2011JP
公開言語 (言語コード) 日本語 (JA)
出願言語 (言語コード) 日本語 (JA)
指定国 (国コード)
発明の名称
(EN) MAGNETIC RESONANCE IMAGING DEVICE AND METHOD FOR DETERMINING HIGH-FREQUENCY MAGNETIC FIELD
(FR) DISPOSITIF D'IMAGERIE PAR RÉSONANCE MAGNÉTIQUE ET PROCÉDÉ DE DÉTERMINATION DE CHAMP MAGNÉTIQUE HAUTE FRÉQUENCE
(JA) 磁気共鳴イメージング装置および高周波磁場決定方法
要約
(EN)
According to this invention, in order to obtain high-quality images even when the slice selection gradient magnetic field waveform is distorted by eddy currents and vibration, high-frequency magnetic field information is calculated on the basis of an output gradient magnetic field waveform applied in accordance with the input gradient magnetic field waveform that is set in a pulse sequence, and the calculated high-frequency magnetic field information is set in the pulse sequence. Then, the set input gradient magnetic field, and the excitation RF pulses of the calculated high-frequency magnetic field information are used during imaging. The output gradient magnetic field waveform used in determining the excitation RF pulses is found by measurement and calculation, for example, by using the input gradient magnetic field waveform.
(FR)
L'invention a pour but d'obtenir des images de qualité élevée même lorsque la forme d'onde de champ magnétique à gradient de sélection de tranche est déformée par des courants de Foucault et une vibration. A cet effet, des informations de champ magnétique haute fréquence sont calculées sur la base d'une forme d'onde de champ magnétique à gradient de sortie appliquée selon la forme d'onde de champ magnétique à gradient d'entrée qui est réglé dans une séquence d'impulsions et les informations de champ magnétique haute fréquence calculées sont réglées dans la séquence d'impulsions. Ensuite, le champ magnétique à gradient d'entrée réglé et les impulsions RF d'excitation des informations de champ magnétique haute fréquence calculées sont utilisées durant une imagerie. La forme d'onde de champ magnétique à gradient de sortie utilisée dans un réglage des impulsions RF d'excitation est trouvée par mesure et calcul, par exemple, à l'aide de la forme d'onde de champ magnétique à gradient d'entrée.
(JA)
 渦電流や振動によりスライス選択傾斜磁場波形が歪む場合であっても高画質の画像を得るために、パルスシーケンスに設定された入力傾斜磁場波形に応じて印加される出力傾斜磁場波形に基づいて、高周波磁場情報を算出し、算出した高周波磁場情報をパルスシーケンスに設定する。そして、撮像時は、設定された入力傾斜磁場と算出した高周波磁場情報の励起RFパルスを用いる。励起RFパルスの決定に用いる出力傾斜磁場波形は、例えば、入力傾斜磁場波形を用て、実測したり、演算により求めたりする。
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