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Magnetic resonance imaging apparatus, Q value calculation method, and specific absorption rate management method
Magnetic resonance imaging apparatus, Q value calculation method, and specific absorption rate management method
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机译:磁共振成像装置,Q值计算方法和比吸收率管理方法
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摘要
Provided is a technique that enables accurate SAR management using power consumption by an object (Pobject) that was calculated based on accurately acquired Q-factors. For this purpose, the present invention calculates Q-factors of each channel of a high-frequency antenna using measurement results of amplitudes of forward waves and reflected waves of each high-frequency signal between three or more different frequencies. An existing SAR monitor in an MRI apparatus is used for the amplitude measurement. Also, the Q-factors are calculated based on a circuit coefficient to be acquired by fitting the measurement results to a predetermined circuit model. Then, the power consumption by an object (Pobject) is calculated using the calculated Q-factors in order to manage the SAR.
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