PROBLEM TO BE SOLVED: To provide an X-ray diagnostic apparatus capable of achieving reduction of exposure to radiation while maintaining required image quality, even in performing image pickup in which a relative moving velocity between a top plate and an X-ray tube changes.SOLUTION: An X-ray diagnostic apparatus includes: a top plate 2a enabling a subject P to lie down an X-ray tube 3c1 for emitting an X-ray toward the subject P on the top plate 2a an X-ray detector 3e for detecting the X-ray having passed through the subject P on the top plate 2a a moving drive section 2b for relatively moving the top plate 2a and the X-ray tube 3c1 in the body axis direction of the subject P on the top plate 2a a velocity detecting section 12 for detecting the relative moving velocity between the top plate 2a and the X-ray tube 3c1 and a tube current adjusting section 13 for adjusting a tube current supplied to the X-ray tube 3c1 so that the minimum X-ray dose may be stable even if the relative movement velocity between the top plate 2a and the X-ray tube 3c1 changes, depending on the relative movement velocity between the top plate 2a and the X-ray tube 3c1 which is detected by the velocity detecting section 12, where the minimum X-ray dose for obtaining the required image quality is the X-ray dose emitted from the X-ray tube 3c1 depending on the body thickness of the subject P.COPYRIGHT: (C)2013,JPO&INPIT【課題】天板とX線管との相対移動速度が変化する撮像を行う場合でも、必要とする画質を維持しつつ被曝低減を実現する。【解決手段】X線診断装置は、被検体Pが横たわる天板2aと、その天板2a上の被検体Pに向けてX線を出射するX線管3c1と、天板2a上の被検体Pを透過したX線を検出するX線検出器3eと、天板2aとX線管3c1とを天板2a上の被検体Pの体軸方向に相対移動させる移動駆動部2bと、天板2aとX線管3c1との相対移動速度を検出する速度検出部12と、被検体Pの体厚に応じて、X線管3c1により出射されるX線のX線量を必要な画質を得る最小のX線量とし、速度検出部12により検出された天板2aとX線管3c1との相対移動速度に応じて、最小のX線量を天板2aとX線管3c1との相対移動速度が変化しても不変とするよう、X線管3c1に供給する管電流を調整する管電流調整部13とを備える。【選択図】図2
