Title:
MAGNETIC RESONANCE IMAGING DEVICE, AND SAR PREDICTION METHOD
Document Type and Number:
WIPO Patent Application WO/2014/080781
Kind Code:
A1
Abstract:
The purpose of the present invention is to easily determine the Q value of an RF irradiation coil in a state where an examination subject is disposed in an MRI device, and to predict a specific absorption rate (SAR) with good accuracy. In order to achieve the foregoing, in a state where an examination subject (1) is disposed in an image pick-up space, high-frequency magnetic field pulses are radiated from an irradiation coil (14a) towards the examination subject (1), and the transmission voltage and reflected voltage of the irradiation coil (14a) are detected. The Q value of the irradiation coil, in a state where the examination subject (1) is disposed, is determined from the transmission voltage and the reflected voltage. Using that Q value, the SAR is predicted in a case where an image pick-up pulse sequence is executed on the examination subject.
Inventors:
ARAI KOICHI (JP)
YATSUO TAKESHI (JP)
SATO YOSHIAKI (JP)
YATSUO TAKESHI (JP)
SATO YOSHIAKI (JP)
Application Number:
PCT/JP2013/080373
Publication Date:
May 30, 2014
Filing Date:
November 11, 2013
Export Citation:
Assignee:
HITACHI MEDICAL CORP (JP)
International Classes:
A61B5/055
Domestic Patent References:
| WO2010041706A1 | 2010-04-15 |
Foreign References:
| US20110148411A1 | 2011-06-23 | |||
| JPH11253416A | 1999-09-21 | |||
| JPH07246194A | 1995-09-26 |
Other References:
Y. ZHU: "In Vivo RF Power and SAR Calibration for Multi-Port RF Transmission", PROC. INTL. SOC. MAG. RESON. MED., vol. 17, April 2009 (2009-04-01)
L. ALON ET AL.: "An Automated Method for Subject Specific Global SAR Prediction in Parallel Transmission", PROC. INTL. SOC. MAG. RESON. MED., vol. 18, May 2010 (2010-05-01)
A. M. EL-SHARKAWY ET AL.: "A Multi-Channel, High Dynamic Range, Real Time RF Power Deposition Monitor", PROC. INTL. SOC. MAG. RESON. MED., vol. 19, May 2011 (2011-05-01)
B. GAGOSKI ET AL.: "Flexibly shaped saturation band excitation using 7T parallel transmit system", PROC. INTL. SOC. MAG. RESON. MED., vol. 19, May 2011 (2011-05-01)
SUKHOON OH ET AL.: "Thermal Conduction from Coil: Assessment of Effects and Comparison to Simulation", PROC. INTL. SOC. MAG. RESON. MED., vol. 20, May 2012 (2012-05-01)
L. ALON ET AL.: "An Automated Method for Subject Specific Global SAR Prediction in Parallel Transmission", PROC. INTL. SOC. MAG. RESON. MED., vol. 18, May 2010 (2010-05-01)
A. M. EL-SHARKAWY ET AL.: "A Multi-Channel, High Dynamic Range, Real Time RF Power Deposition Monitor", PROC. INTL. SOC. MAG. RESON. MED., vol. 19, May 2011 (2011-05-01)
B. GAGOSKI ET AL.: "Flexibly shaped saturation band excitation using 7T parallel transmit system", PROC. INTL. SOC. MAG. RESON. MED., vol. 19, May 2011 (2011-05-01)
SUKHOON OH ET AL.: "Thermal Conduction from Coil: Assessment of Effects and Comparison to Simulation", PROC. INTL. SOC. MAG. RESON. MED., vol. 20, May 2012 (2012-05-01)
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