PROBLEM TO BE SOLVED: To provide an X-ray diagnostic apparatus capable of reducing an exposure dosage in an area of non-interest and moving a dosage reduction filter in accordance with the position and size of an area of interest.SOLUTION: An X-ray diagnostic apparatus 1 includes: an image generation part 29 which generates an X-ray image on the basis of output from an X-ray detector 21 for detecting an X-ray generated from an X-ray tube 13 a dosage reduction filter 17 which includes a non-reduction passage portion allowing the X-ray to pass therethrough in such a manner that the dosage of the X-ray is not reduced and a dosage reduction portion being a periphery of the non-reduction passage portion and reducing the dosage, and is provided on the front face of the X-ray tube 13 a movement amount determination part 41 which determines the movement amount of the dosage reduction filter 17 on the basis of the position of an area of interest in order to make the X-ray having passed through the non-reduction passage portion reach a partial area on a detection surface in the X-ray detector 21 corresponding to the area of interest set in the X-ray image and a movement support mechanism 19 which movably supports the dosage reduction filter 17 in accordance with the movement amount.COPYRIGHT: (C)2015,JPO&INPIT【課題】非関心領域における被曝量を低減しかつ関心領域の位置及び大きさに応じて線量低減フィルタを移動可能なX線診断装置の提供。【解決手段】X線診断装置1は、X線管13から発生されたX線を検出するX線検出器21からの出力に基づいてX線画像を発生する画像発生部29と、X線の線量を非低減で通過させる非低減通過部分と、非低減通過部分の周囲であって線量を低減させる線量低減部分とを有し、X線管13の前面に設けられる線量低減フィルタ17と、X線画像に設定された関心領域に対応するX線検出器21における検出面上の部分領域に非低減通過部分を通過したX線を到達させるために、関心領域の位置に基づいて線量低減フィルタ17の移動量を決定する移動量決定部41と、移動量に従って線量低減フィルタ17を移動可能に支持する移動支持機構19と、を具備する。【選択図】図1
