PROBLEM TO BE SOLVED: To stably compensate an error magnetic field in an imaging space of a super-conducting magnet comprising a refrigerator.SOLUTION: A vibration magnetic field of a super-conducting magnet 103 comprising a refrigerator 105 is measured, and based on the vibration magnetic field, a wave form of a magnetic field component in at least two directions, is determined. A vibration magnetic field compensation unit 117 generates a vibration magnetic field for cancelling the vibration magnetic field of the determined wave form, for correcting a spatial distribution of the vibration magnetic field.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2016,JPO&INPIT【課題】冷凍機を備えた超電導磁石の撮影空間の誤差磁場を安定して補償する。【解決手段】冷凍機105を備えた超電導磁石103の振動磁場を計測し、その振動磁場から少なくとも2方向の磁場成分の波形を求める。振動磁場補償ユニット117は、少なくとも2方向について、求めた波形の振動磁場を打ち消す振動磁場を発生させ、振動磁場の空間分布を補正する。【選択図】図3
