PROBLEM TO BE SOLVED: To provide an MRI apparatus comprising a multichannel transmission coil, which MRI apparatus performs optimum RF shimming for individual patients to be imaged, while confining local SAR to a predetermined limit value or less.SOLUTION: The MRI apparatus comprises: a multichannel transmission coil a high-frequency magnetic field shimming unit 213 for performing high-frequency magnetic field shimming to determine transmission high-frequency magnetic field parameters, which are parameters transmitted from each channel for high-frequency magnetic fields, such that the high-frequency magnetic field distribution in a region of interest is optimized and an imaging unit 220 for capturing images using the transmission high-frequency magnetic field parameters determined by the high-frequency magnetic field shimming unit. The high-frequency magnetic field shimming unit 213 determines the transmission high-frequency magnetic field parameters by using at least one of an optimization index which indicates a uniformity of the high-frequency magnetic field distribution in the region of interest, a local specific absorption ratio and a systemic specific absorption ratio, and information to specify exclusion parameters which are the high-frequency magnetic field parameters to be excluded at high-frequency magnetic field shimming.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT
