PROBLEM TO BE SOLVED: To provide a technique detecting defective elements in an optional stage.SOLUTION: An X-ray CT apparatus includes: an X-ray source an X-ray detector provided with a plurality of X-ray detection elements outputting analog data corresponding to the amount of detected X-rays a data collecting device which is mounted corresponding to each of the X-ray detection elements and includes the same number of data-collecting elements collecting digital data obtained by converting the analog data, as the number of the X-ray detection elements a rotating disk on which the X-ray source and the X-ray detector are mounted while facing each other and which rotates an image reconstruction device which creates reconstructed images an image display device and a defective element detecting part which detects defects in measurement elements composed of a pair of combinations of the X-ray detection elements and the data collection elements corresponding thereto. The defective element detecting part generates determination/measurement data for being used for determination of malfunction with respect to each of the measurement elements, generates determination reference data based on determination/measurement data of peripheral elements, and determines the defects based on the result of comparison between the determination/measurement data and the determination reference data of the measurement elements as a target for the determination of the defects.COPYRIGHT: (C)2014,JPO&INPIT【課題】任意の段階において故障素子を検出する技術を提供する。【解決手段】X線CT装置は、X線源と、検出したX線量に応じたアナログデータを出力するX線検出素子を複数備えたX線検出器と、X線検出素子のそれぞれに対応して設けられ、アナログデータをデジタルデータに変換して収集するデータ収集素子を、X線検出素子と同数備えたデータ収集装置と、X線源とX線検出器とを対向させて搭載し、回転する回転円盤と、再構成画像を生成する画像再構成装置と、画像表示装置と、X線検出素子とそれに対応するデータ収集素子との1対の組み合わせからなる計測素子の故障を検出する故障素子検出部と、を備える。故障素子検出部は、計測素子毎に故障判定に用いるための判定計測データを生成し、周辺素子の判定計測データに基づいて判定基準データを生成し、故障判定の対象となる計測素子の判定計測データと判定基準データとの比較結果に基づいて、故障判定を行う。【選択図】 図3
