While changing tube voltage, the multiple energy type x-ray CT device which can decrease being bombed of the x-ray which is irradiated to the suffering inspection body is offered. The x-ray tube 1 which irradiates the x-ray beam to the suffering inspection body which is placed in the bed and x-ray tube 1 and be opposed arranged and while the detector focusing on the body axis of 3 which detects the x-ray which transmitted the aforementioned suffering inspection body and the aforementioned suffering inspection body x-ray tube 1 and detector 3 turning to circumferential direction, irradiating the x-ray beam, while being acquired DAS10 which acquires the x-ray transmitted data of the aforementioned suffering inspection body with detector 3 and, by the reconstruction computing element 11 which it reconstructs processes the fault picture and DAS10 from the x-ray transmitted data of the suffering inspection body which is acquired, it is impressed in x-ray tube 1The x-ray controller 6 which changes voltage and x-ray tube it is arranged between 1 and the aforementioned suffering inspection body, while being acquired by the x-ray filter 2 which modifies the energy of the x-ray beam where it can change the voltage which is impressed in x-ray tube 1 by x-ray controller 6 and DAS10, the x-ray filter controller 7 which drives x-ray filter 2 and, it has.管電圧を切り替えている間に被検体に照射されるX線の被曝を低減し得るマルチエネルギー型X線CT装置を提供する。寝台に載せられた被検体にX線ビームを照射するX線管1と、X線管1と対向配置され前記被検体を透過したX線を検出する検出器3と、前記被検体の体軸を中心にX線管1と検出器3が円周方向に回転しながらX線ビームを照射して前記被検体のX線透過データを検出器3で取得するDAS10と、取得された被検体のX線透過データから断層画像を再構成処理する再構成演算器11と、DAS10によって取得される間に、X線管1に印加される電圧を切り替えるX線制御器6と、X線管1と前記被検体の間に配置され、X線制御器6によってX線管1に印加される電圧が切り替えられたX線ビームのエネルギーを変更するX線フィルタ2と、DAS10によって取得される間に、X線フィルタ2を駆動させるX線フィルタ制御器7と、を備える。
