PROBLEM TO BE SOLVED: To inhibit an X-ray generator and an X-ray detector revolving around a subject from coming into contact with the subject.SOLUTION: An X-ray CT imaging apparatus 10 comprises: a revolving support unit 20 for supporting an X-ray generator 22 and an X-ray detector 24; a revolving drive mechanism 30 including a revolving mechanism 32 and a revolving axis movement mechanism 38; an imaging region position setting unit 40 for accepting setting of a position of an imaging region R with respect to a spot of a dental arch of a head P; and a revolving control unit 60. Position control of a revolving axis X1 on the mechanism is performed according to the position of the imaging region R set by the imaging region position setting unit 40.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】被写体周りを旋回するX線発生器及びX線検出器が被写体に接触することを抑制することを目的とする。【解決手段】X線CT撮影装置10は、X線発生器22とX線検出器24とを支持する旋回支持部20と、旋回機構32と旋回軸移動機構38とを含む旋回駆動機構30と、頭部Pの歯列弓の局所に対する撮影領域Rの位置の設定を受付ける撮影領域位置設定部40と、旋回制御部60とを備える。撮影領域位置設定部40で設定された撮影領域Rの位置に応じて、機構上の旋回軸X1の位置制御を行う。【選択図】図1