PROBLEM TO BE SOLVED: To improve image quality of a difference image generated from an image of an outward trip and an image of a return trip when photographing is performed by continuously rotating an X-ray tube and an X-ray detector about a subject while a top plate where the subject is placed is reciprocally moved in a direction of a body axis.SOLUTION: In performing go-and-return helical scanning or helical shuttle scanning, a bed driving part 22 reciprocally moves the top plate 21 where the subject P is placed in the direction of the body axis, and a pedestal driving part 16 rotates the X-ray tube 12 and the X-ray detector 13 about the subject P placed on the top plate 21. Then, when the top plate 21 is reciprocally moved by the bed driving part 22, a scan control part 33 controls the pedestal driving part 16 in a manner to reverse the rotating direction of the X-ray tube 12 and the X-ray detector 13 between the outward trip and the return trip.COPYRIGHT: (C)2011,JPO&INPIT【課題】被検体が載置される天板を体軸方向に往復移動させながら、被検体を中心にX線管およびX線検出器を連続的に旋回移動させて撮影を行う場合に、往路の画像と復路の画像とから生成される差分画像の画質を向上させる。【解決手段】ゴー&リターンヘリカルスキャンまたはヘリカルシャトルスキャンが行われる場合に、寝台駆動部22が、被検体Pが載置される天板21を体軸方向に往復移動させ、架台駆動部16が、天板21に載置された被検体Pを中心にX線管12およびX線検出器13を旋回移動させる。そして、スキャン制御部33が、寝台駆動部22によって天板21が往復移動される際に、往路と復路とでX線管12およびX線検出器13の旋回方向が反転するように架台駆動部16を制御する。【選択図】図1
