PROBLEM TO BE SOLVED: To provide an MRI apparatus providing high uniformity of a static magnetic field.SOLUTION: The MRI apparatus includes an MRI body 200, a control device for controlling operation of the MRI body 200, and a bed on which a subject is placed. The MRI body 200 includes: static magnetic field generators 300, 400 for generating a static magnetic field on an observation area 204 gradient magnetic field generators 210, 211 for generating a gradient magnetic field and RF pulse irradiation coils 214, 215. The static magnetic field generators 300, 400 include coils 320, 420 for generating magnetic fluxes, and magnetic materials 318, 418 for uniformizing the magnetic fluxes. Support mechanisms of the magnetic materials 318, 418 include heat generators 522, 524 at parts thereof, where the physical relationship of the magnetic materials 318, 418 is controlled by controlling heat-generating amounts of the heat generators 522, 524.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】静磁場の高い均一性が得られるMRI装置を提供する。【解決手段】MRI装置は、MRI本体200とMRI本体200の動作を制御する制御装置と被検体を載せる寝台とを有し、MRI本体200は、観測領域204に静磁場を発生する静磁場発生装置300,400と、傾斜磁場を発生する傾斜磁場発生装置210,211と、RFパルス照射コイル214,215とを有し、静磁場発生装置300,400は磁束を発生するコイル320,420と磁束の均一化を図るための磁性材318,418を有し、磁性材318,418の支持機構の一部に発熱体522,524を設け、発熱体522,524の発熱量を制御することにより、磁性材318,418の位置関係を制御する。【選択図】図2
