PROBLEM TO BE SOLVED: To provide an X-ray image diagnostic apparatus capable of setting a CT imaging position optimum for reduction in an exposure doze.SOLUTION: The X-ray image diagnostic apparatus includes: an X-ray fluoroscope including an imaging system composed of an X-ray generation part emitting an X ray onto a subject placed on a bed, and an X-ray detection part disposed so as to be opposite to the X-ray generation part a CT device controlled by a coordinate system common to the X-ray fluoroscope a region-of-interest setting part setting a designation region in the vicinity of a region of interest projected on a radiographic image imaged by the imaging system a region-of-interest position estimating part estimating the position of the region of interest of the subject by using the designation region and an imaging position calculation part calculating an imaging position of the CT device on the basis of the estimated position of the region of interest.COPYRIGHT: (C)2014,JPO&INPIT【課題】被曝量低減に対して最適なCT撮影位置を設定できるX画像診断装置を提供すること。【解決手段】本実施形態のX線画像診断装置は、寝台に載置される被検体にX線を発生するX線発生部、及びこのX線発生部に対向して配置されるX線検出部とで構成される撮像系を備えるX線透視装置と、前記X線透視装置と共通の座標系で制御されるCT装置と、前記撮像系で撮影されるX線撮影画像上に投影される関心領域近傍に指定領域を設定する関心領域設定部と、前記指定領域を用いて被検体の関心領域の位置を推定する関心領域位置推定部と、前記関心領域の推定位置に基づいて前記CT装置の撮影位置を計算する撮影位置計算部と、を有する。【選択図】図1
