A rotating scanner equipped with an X-ray detector and X-ray source in the arranged as opposed to rotate around the subject, the X-ray CT apparatus comprising a stationary portion for supporting the rotary scanner, and a rotary scanner In order to transmit and receive optical signals to and from the stationary part, with a composed signal transmitting unit by the light-receiving section and the light emitter and between the light emitter and the light body, and diffuses the light that is emitted from the light emitter The provision of the prism sheet for condensing the light receiving portion and / or the diffusion sheet to, and to provide an X-ray CT apparatus that can improve the reliability with which facilitate the maintenance of the signal transmission means.対向した配置関係にあるX線源とX線検出器とを搭載し、被検体の周囲を回転する回転スキャナと、該回転スキャナを支持する静止部とからなるX線CT装置において、回転スキャナと静止部との間で光信号の送受信を行うために、発光体と受光部とにより構成される信号伝送部を備え、発光体と受光部との間に、発光体から発せされる光を拡散するための拡散シート及び/又は受光部に集光させるためのプリズムシートを設けることで、信号伝送手段の保守点検を容易とすると共に信頼性を向上することができるX線CT装置を提供する。
