PROBLEM TO BE SOLVED: To provide an X-ray CT scanner which makes a gantry automatically move within a specified safe range in a direction opposite to a scanning direction.SOLUTION: This X-ray CT scanner includes: an imaging means which includes each of an X-ray source 101 and an X-ray detector 102 a rotary frame 103 which rotates the imaging means around a subject a base moving device 105 for moving the imaging means along the direction of the body axis of the subject P a range setting means for setting a scanning range or an image generation range a safe position input means for inputting a safe position indicating a range making the imaging means movable and a scanning control portion 201 which determines an approach run position and a stop one on the basis of the scanning range and the image generation one, which moves the imaging means from the approach run position, and which stops the imaging means in the stop position.COPYRIGHT: (C)2009,JPO&INPIT【課題】指定された安全な範囲内でガントリをスキャン方向と逆方向に自動的に移動させるX線CT装置を提供する。【解決手段】X線源101とX線検出器102とをそれぞれ含む撮影手段と、撮影手段を前記被検体の周囲にて回転させる回転フレーム103と、撮影手段を被検体Pの体軸方向に沿って移動させる架台移動装置105と、スキャン範囲又は画像生成範囲を設定する範囲設定手段と、撮影手段が移動可能な範囲を示す安全位置を入力する安全位置入力手段と、スキャン範囲又は画像生成範囲に基づいて助走開始位置及び停止位置を求め、該助走開始位置から撮影手段を移動させ、該停止位置で前記撮影手段を停止させるスキャン制御部201と、を備える。【選択図】図1
