PROBLEM TO BE SOLVED: To reduce restrictions as much as possible when the part of a patient is arranged between an X-ray generating section and an X-ray detector.SOLUTION: This medical X-ray CT imaging system includes: a base body 22 a supporting section 30 and a rotation driving section which rotate-drives the supporting section 30. In this case, the supporting section 30 includes: a supporting arm section 32 which supports the X-ray generating source 36 and the X-ray detector 37 under a confronted state and a rotation supporting section 40 which rotatably supports the supporting arm section 32 to the base body 22. At least on one of the base body 22 and the rotation supporting section 40, a cavity section 48 which forms a space around the rotation axis A is formed. In the cavity section 48, a cylindrical body 60 is arranged under a freely rotatable state to the supporting section 30.COPYRIGHT: (C)2011,JPO&INPIT【課題】患者の局部をX線発生部とX線検出器との間に配設する際の制約をなるべく少なくすること。【解決手段】基体22と、X線発生源36とX線検出器37とを対向状態で支持する支持アーム部32と、支持アーム部32を基体22に対して回転可能に支持する回転支持部40とを有する回転支持部とを有する支持部30と、支持部30を回転駆動する回転駆動部とを備えている。基体22及び回転支持部40のうちの少なくとも一方に、回転軸A周りに空間を形成する空洞部48が形成されている。この空洞部48内に、筒状体60が支持部30に対して回転自在な状態で配設されている。【選択図】図1
