PROBLEM TO BE SOLVED: To make reduction effect of an exposure doze effective when using a filter.SOLUTION: An X-ray computer tomography apparatus includes: a frame 1 having an X-ray tube flexibly rotating around the circumference of a subject, and an X-ray detector a bed 2 having a top plate flexibly movable with respect to three axes of a rotational axis of the X-ray tube and two axes orthogonal to the rotational axis and a control part 30 controlling movement of the top plate for making the position of interest relating to the subject match or come closest to the position of the rotation axis of the X-ray tube.COPYRIGHT: (C)2014,JPO&INPIT【課題】フィルタを使った場合に被曝線量の低減効果を実効的なものとすること。【解決手段】X線コンピュータ断層撮影装置は、被検体の周囲を回転自在なX線管とX線検出器を有する架台1と、X線管の回転軸と回転軸に直交する2軸との3軸に関し移動自在な天板を有する寝台2と、被検体に関する関心位置をX線管の回転軸の位置に一致又は最接近させるために天板の移動を制御する制御部30とを具備する。【選択図】図1
