PROBLEM TO BE SOLVED: To configure an X-ray generator to rotate around a subject as closely as possible thereto, while inhibiting the X-ray generator and an X-ray detector from coming into contact with the subject.SOLUTION: While an imaging region R is captured by X-ray CT imaging, an X-ray generator 22 and an X-ray detector 24 are rotatingly moved around a head part P within a rotating range of 270° or less, the X-ray detector 24 passes a side where the imaging region R is eccentrically located in the head part P, out of the periphery of the head part P, and the X-ray generator 22 passes an opposite side of the eccentrically-located side, out of the periphery of the head part P, so that the X-ray detector 24 forms an arc-shaped X-ray detection trajectory Or by the rotating movement. When the imaging region R set by an imaging region positioning part 40 is eccentric to any of the left/right with respect to a midline Mc of the head part P, the rotating range of a rotation support part 20 is set such that a central part OrM of the arc of the X-ray detection trajectory Or is eccentric to the same side with respect to the midline Mc as the eccentrically-located side of the imaging region R.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】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しつつ、Ｘ線発生器がなるべく被写体に近くを旋回するようにする。【解決手段】撮影領域ＲのＸ線ＣＴ撮影を行う間、Ｘ線発生器２２とＸ線検出器２４とを頭部Ｐの周りに２７０°以下の旋回範囲で旋回移動させて、かつ、Ｘ線検出器２４が頭部Ｐの周囲のうち、撮影領域Ｒが頭部Ｐ中で偏在する側を通過し、Ｘ線発生器２２が頭部Ｐの周囲のうち、偏在する側の反対側を通過し、Ｘ線検出器２４が旋回移動によって弧のＸ線検出軌道Ｏｒを形成する。撮影領域位置設定部４０で設定された撮影領域Ｒが頭部Ｐの正中Ｍｃに対して左右のいずれかに偏った位置にある場合に、Ｘ線検出軌道Ｏｒの弧の中央部ＯｒＭが、正中Ｍｃに対し、撮影領域Ｒが偏っている側と同じ側に偏って位置するように、旋回支持部２０の旋回範囲を設定する。【選択図】図１
