PROBLEM TO BE SOLVED: To provide an X-ray CT (computed tomography) apparatus in which the temperature control of a PDA (photodiode array) is facilitated with a simple structure to improve the image quality of a CT image, allowing the temperature control to be applied particularly to a case in which an X-ray detector and a DAS (data acquisition system) are configured to be adjacent structures, or a unitary structure.SOLUTION: The X-ray CT apparatus includes: a scintillator configured to emit a fluorescent based on an X-ray from an X-ray source the PDA 52 having a photodetection element 52a configured to convert the fluorescent into an electrical signal, a temperature sensor 52b, and a heat element 52c the DAS 24 configured to collect transmission data based on the electrical signal and a controller 26 configured to control a temperature of a photodiode 52 by adjusting an electric current of the heat element 52c based on the temperature detected by the temperature sensor 52b.COPYRIGHT: (C)2012,JPO&INPIT【課題】X線CT装置において、簡素な構造によってPDAの温度制御を容易にすることでCT画像の画質を向上させ、特に、X線検出器とDASとを近接、又は一体化する場合にも温度制御を応用すること。【解決手段】X線CT装置は、X線源からのX線を基に蛍光を発するシンチレータと、蛍光を電気信号に変換する受光素子52a、温度センサ52b、及び熱源素子52cを有するPDA52と、電気信号に基づく透過データを収集するDAS24と、温度センサ52bで検知された温度を基に熱源素子52cの電流を調整することで、フォトダイオード52の温度を制御するコントローラ26と、を備える。【選択図】 図3
