PROBLEM TO BE SOLVED: To improve the quality of an image to be reconstituted by suppressing a rotary part from vibrating around the rotary center of a tilt part when a subject is scanned by rotating the rotary part, where an X-ray tube and an X-ray detector are attached to an annular frame, around the subject in the X-ray CT apparatus having the tilt part.SOLUTION: An X-ray CT apparatus includes: a base table 25 a tilt part 13 supported by the base table 25 so as to be rotatable around a spindle 27 a tilt driving part 7 for rotating the tilt part 13 at an arbitrary angle around the spindle 27 a rotary part 12 which has an annular frame 28, and an X-ray tube 9 and an X-ray detector 10 attached to the frame 28 and opposed each other and which is supported by the tilt part 13 so as to be rotatable around the center of the frame 28 and a brake device 8 for fixing the tilt part 13 to the base table 25.COPYRIGHT: (C)2013,JPO&INPIT【課題】チルト部を備えるX線CT装置において、円環状のフレームにX線管とX線検出器とを取付けた回転部を被検体の周りに回転させて被検体をスキャンした場合に、回転部がチルト部の回動中心回りに振動することを抑制し、再構成される画像の品質を向上させる。【解決手段】X線CT装置において、基台25と、基台25に支軸27の回りに回動可能に支持されたチルト部13と、チルト部13を支軸27の回りに任意の角度に回動させるチルト駆動部7と、円環状のフレーム28とこのフレーム28に取付けられて対峙するX線管9とX線検出器10とを有し、フレーム28の中心回りに回転可能にチルト部13に支持された回転部12と、チルト部13を基台25に固定するブレーキ装置8と、を備える。【選択図】 図2
