PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus which can cope with the failure of the X-ray detector and identify a failure channel automatically to perform data replacement.SOLUTION: An X-ray CT apparatus includes: a photographing section including an X-ray tube being configured to radiate an X-ray to a subject and an X-ray detector of a multi channel type disposed opposite to the X-ray tube a failure channel decision section which compares an output value of the channel direction from the X-ray detector when a pseudo model is photographed by the photographing section, with a preset threshold, to decide a channel with an output value more than the threshold to be a failure channel and a data processing section which processes the output data of the X-ray detector when the subject is photographed by the photographing section, and when there is a failure channel, replaces the data of the failure channel with data which is obtained by interpolating output data of a plural channels around the failure channel.COPYRIGHT: (C)2013,JPO&INPIT【課題】X線検出器の故障に対処し、自動的に故障チャンネルを特定してデータ置換を行うX線CT装置を提供する。【解決手段】被検体にX線を曝射するX線管と、X線管と対向配置した多チャンネル型のX線検出器とを含む撮影部と、撮影部によって疑似模型を撮影したときの、X線検出器のチャンネル方向の出力値を予め設定した閾値と比較し、閾値を超える出力値を呈するチャンネルを故障チャンネルと判定する故障チャンネル判定部と、撮影部によって被検体を撮影したときのX線検出器の出力データを処理し、故障チャンネルがある場合は、故障チャンネルのデータを故障チャンネルの周囲の複数チャンネルの出力データを補間して得たデータに置換するデータ処理部と、を備える。【選択図】図1
