PROBLEM TO BE SOLVED: To reduce the load of a user when setting a shimming region (a region for correcting the uniformity of an electromagnetic field).SOLUTION: The shimming region is automatically set on the basis of an image by preparatory photographing. As one example, in the case where a photographing target region is the mamma, the positions of the maximum values MAX1 and MAX2 are searched on the profile Prl obtained by projecting and integrating an axial tomographic image Ga in an AP direction and the regions [Xa, Xb] and [Xc, Xd] in the RL direction of the mamma are detected on the basis of the searched positions. The position of the maximum value is searched on the profile obtained by projecting and integrating a sagittal preparatory image in the AP direction and the region in the SI direction of the mamma is detected on the basis of this position. Then, the position of an inflection point is searched on the profile obtained by projecting and integrating a sagittal preparatory image in the SI direction and the region in the AP direction of the mamma is detected on the basis of this position. The shimming region is set on the basis of the calculated three-dimensional region of the mamma.COPYRIGHT: (C)2013,JPO&INPIT【課題】シミング領域(静磁場の均一度を補正する領域)の設定に際し、ユーザの負担を軽減させる。【解決手段】シミング領域を、予備撮影で得た画像を基に自動で設定する。一例として、撮影対象部位が乳房の場合、アキシャル断層像GaをAP方向に投影、積算して得たプロファイルPrl上で極大値MAX1,MAX2の位置を探索し、この位置を基に乳房のRL方向の領域[Xa,Xb],[Xc,Xd]を検出する。サジタル予備画像をAP方向に投影、積算して得たプロファイル上で極大値の位置を探索し、この位置を基に乳房のSI方向の領域を検出する。そして、サジタル予備画像をSI方向に投影、積算して得たプロファイル上で変曲点の位置を探索し、この位置を基に乳房のAP方向の領域を検出する。求めた乳房の3次元領域を基にシミング領域を設定する。【選択図】図4
