PROBLEM TO BE SOLVED: To realize a trade-off relationship between a focus size of an X-ray tube and a maximum output at a higher level. An X-ray CT apparatus according to an embodiment includes a control unit. The control unit controls the movement of the focal point of the X-ray tube. The controller calculates a first speed at which the focus is moved continuously and periodically from the viewpoint of not melting the anode of the X-ray tube, and continuously and periodically moves the focus from the viewpoint of satisfying the required resolution. A second speed for moving is calculated, and a third speed for moving the focus continuously and periodically is determined from the lower limit speed and the upper limit speed in accordance with the purpose of photographing. [Selection diagram] Figure 1【課題】Ｘ線管の焦点サイズと最大出力とのトレードオフの関係をより高いレベルで実現させること。【解決手段】実施形態に係るＸ線ＣＴ装置は、制御部を備える。前記制御部は、Ｘ線管の焦点の移動を制御する。前記制御部は、前記Ｘ線管の陽極を熔解させない観点から焦点を連続的かつ周期的に移動させる第１の速度を算出し、要求される解像度を満たす観点から焦点を連続的かつ周期的に移動させる第２の速度を算出し、前記下限の速度と前記上限の速度とから、撮影の目的に応じて焦点を連続的かつ周期的に移動させる第３の速度を決定する。【選択図】図１
