Patent ID: 8021044

Claim:
An X-ray computed tomography apparatus comprising: an X-ray source which irradiates a subject with X-rays; an X-ray detection unit which detects the X-rays transmitted through the subject and produces a detection signal; a rotating frame which supports the X-ray source and the X-ray detection unit so as to be opposed to each other, said rotating frame is rotated around the subject; a bearing which rotatably supports the rotating frame; a support frame which supports the bearing; an electrically conductive brush which is disposed on the support frame; a slip ring which is annularly disposed on the rotating frame in a direction of rotation of the rotating frame, mechanically contacts the brush, and is configured to supply an electrical power to the rotating frame, wear debris being produced in a contact area between the slip ring and the brush; a plurality of fins which are arranged between the bearing and the slip ring and are provided on the rotating frame, the plurality of fins are rotated with the rotating frame to produce airflow flowing from a side of the bearing to the outside of the apparatus in such a manner that the airflow transports the wear debris to the outside of the apparatus; and a labyrinth seal or a cover plate which is provided between the bearing and the slip ring and is fixed to the rotating frame to prevent the wear debris from being scattered from the contact area.