PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus allowing acquisition of a photographing range without needing scanography, and without increasing cost.SOLUTION: The X-ray CT apparatus introducing a top plate on which a test subject is placed into a base and photographing the test subject to acquire a tomographic image includes a winding shaft, a support means, and an arithmetic part. A linear member formed in a linear shape is wound around the winding shaft. The support means is provided in the base, and supports the winding shaft such that the winding shaft is inclined according to a direction to which the linear member is paid out from the winding shaft. The arithmetic part calculates the photographing range relative to the base based on a length by which the linear member is paid out and an angle by which the winding shaft is inclined when paying out the tip of the linear member from the winding shaft to the range where the tomographic image is acquired by the photographing.COPYRIGHT: (C)2012,JPO&INPIT【課題】スキャノ撮影を必要とせず、コストを嵩ませずに、撮影範囲を求めることが可能なX線CT装置を提供する。【解決手段】被検体を載置した天板を架台内に導入して、被検体を撮影し断層像を取得するX線CT装置において、巻き軸と、支持手段と、演算部とを有している。巻き軸には、線状に形成された線状部材が巻かれている。支持手段は、架台に設けられ、巻き軸から線状部材が繰り出される方向に応じて巻き軸を傾かせるように支持する。演算部は、撮影により断層像を取得する範囲に対して巻き軸から線状部材の先端を繰り出したとき、線状部材が繰り出された長さ、及び、巻き軸が傾いた角度を基に、架台に対する相対的な撮影範囲を算出する。【選択図】図1
