PROBLEM TO BE SOLVED: To reduce remarkable sensitivity degradation generated depending on positioning of a subject in X-ray imaging using an AEC sensor.SOLUTION: An X-ray diagnostic apparatus 100 which performs X-ray imaging in an AEC (Auto Exposure Control) imaging mode includes: a detection signal cumulative value measurement part 11 for measuring a cumulative value of detection signals of an AEC sensor disposed near a subject a minimum irradiation time setting part 12 for setting the minimum irradiation time of X-ray irradiation on the basis of at least one of subject information of the subject, inspection information and an imaging condition an elapsed time measurement part 13 for measuring the elapsed time of the X-ray irradiation to the subject and an irradiation timing setting part 14 for setting irradiation stop timing for stopping the X-ray irradiation to the subject on the basis of a comparison result of the elapsed time and the minimum irradiation time, a comparison result of the elapsed time and the preset maximum irradiation time, and a comparison result of the cumulative value of the detection signals and a prescribed threshold.COPYRIGHT: (C)2014,JPO&INPIT【課題】AECセンサを用いたX線撮影において被検体のポジショニングに依存して発生する著しい感度劣化を低減する。【解決手段】AEC(Auto EXposure Control)撮影モードのX線撮影を行なうX線診断装置100は、被検体の近傍に配置されたAECセンサの検出信号の累積値を計測する検出信号累積値計測部11と、前記被検体の被検体情報、検査情報及び撮影条件の少なくとも何れかに基づいてX線照射の最小照射時間を設定する最小照射時間設定部12と、前記被検体に対するX線照射の経過時間を計測する経過時間計測部13と、前記経過時間と前記最小照射時間との比較結果、前記経過時間と予め設定された最大照射時間との比較結果及び前記検出信号の累積値と所定の閾値との比較結果に基づいて前記被検体に対するX線照射を停止させる照射停止タイミングを設定する照射タイミング設定部14を備える。【選択図】 図1
