PROBLEM TO BE SOLVED: To reduce pulsation artifact and radiation dose without using electrocardiographic synchronized radiography.SOLUTION: An X-ray computer tomography apparatus includes: an X-ray tube a high pressure generating part for generating a tube voltage and a tube current to the X-ray tube a control part for controlling the high pressure generating part to repeat alternatively an X-ray ON period in which X-rays are generated with a prescribed dosage and an X-ray OFF period in which X-ray radiation is stopped or X-rays are generated with a dosage less than the prescribed dosage and an image reconfiguration part for reconfiguring image data on the basis of an output of the X-ray detector corresponding to the X-ray ON period. A time length of the X-ray OFF period is predetermined according to a cardiac rate of an analyte.COPYRIGHT: (C)2014,JPO&INPIT【課題】心電同期撮影法を用いることなく拍動アーチファクトの低減を被曝低減とともに実現すること。【解決手段】X線コンピュータ断層撮影装置は、X線管と、X線管に対する管電圧及び管電流を発生する高圧発生部と、X線検出器と、X線を所定線量で発生するX線オン期間とX線を停止し又は前記所定線量よりも低い線量で発生するX線オフ期間とを交互に繰り返すために高圧発生部を制御する制御部と、X線オン期間に対応するX線検出器の出力に基づいて画像データを再構成する画像再構成部とを具備し、X線オフ期間の時間長は被検体の心拍数に応じて事前に決定される。【選択図】 図1
