PROBLEM TO BE SOLVED: To prevent an ineffective exposure of a subject when determining an appropriate irradiation condition of X-ray pulse.SOLUTION: An X-ray fluoroscopic apparatus 100 includes: an X-ray tube 1 for irradiating repeated X-ray pulse at a predefined pulse rate to a subject 101； an X-ray detector 10 for detecting the X-ray that has penetrated through the subject 101； a distance measuring part 6 provided in the vicinity of the X-ray tube 1 and measuring a first distance d1 to a body surface of the subject 101； and a system control part 14 that determines the irradiation condition of the repeatedly irradiated X-ray pulse according at least to the first distance d1.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】Ｘ線パルスの適切な照射条件を決定する際の、被検者の無効被ばくを防ぐことを目的とする。【解決手段】Ｘ線透視撮影装置１００は、所定のパルスレートで繰り返しＸ線パルスを被検者１０１に照射するＸ線管１と、被検者１０１を透過したＸ線を検出するＸ線検出器１０と、Ｘ線管１近傍に設けられ、被検者１０１の体表までの第１の距離ｄ１を測定する測距部６と、少なくとも第１の距離ｄ１に応じて、繰り返し照射されるＸ線パルスの照射条件を決定するシステム制御部１４とを備える。【選択図】図１
