PROBLEM TO BE SOLVED: To provide a radiation tomographic apparatus where the radiotransparent fault image of the radiation grid is not reflected in the radiation tomographic image regardless of the cutting position.SOLUTION: An X-ray grid 8 is relatively moved to FPD so as to change the position where the X-ray transparent fault image of the X-ray grid 8 is reflected into FPD while the X-ray transparent image is successively taken. Additionally, the X-ray grid 8 is not followed to the X-ray image of the subject in the grid unmoved cutting position, and the appearance position of the transparent fault image which the X-ray grid 8 has is moved to the X-ray image of the subject in the grid unmoved cutting position while the X-ray transparent image is successively taken, and the X-ray transparent fault image of the X-ray grid 8 is not reflected into the X-ray tomographic image.COPYRIGHT: (C)2010,JPO&INPIT【課題】裁断位置に係らず放射線グリッドの放射線透過ムラが放射線断層画像に写り込むことがない放射線断層撮影装置を提供する。【解決手段】X線グリッド8をFPDに対して相対移動させて、X線グリッド8のX線透過ムラのFPDに写り込む位置を変更させながらX線透視画像を連写する。そうすると、グリッド不動裁断位置における被検体のX線像にX線グリッド8が追従せず、X線グリッド8が有する透過ムラの出現位置をグリッド不動裁断位置における被検体のX線像に対してズレながらX線透視画像が連写され、X線グリッド8のX線透過ムラがX線断層画像に写り込むことがない。【選択図】図4
