The multiple energy photographing possible x-ray CT device of high speed and high picture quality is offered high energy low the x-ray beam of energy making use of the change possible x-ray supply system and that to high speed. The rotating anode the x-ray tube having with tube voltage occurrence section 9a and tube variable voltage control section 9d1 and filament heating unit 9b and tube electric current control section 9d2 and grid voltage occurrence section 9c and grid opening and closing control section 9d3 and the grid change section 9e where, controls the condition of 9 which has two grid electrodes 202a and 202b where controls the discharge of 204 which emits the x-ray from the x-ray focus with the electron beam which is discharged from two cathodes 200a, 200b and these cathode filaments and the aforementioned electron beam and the x-ray it forms the x-ray supply system. Changing to every projection angle which the energy x-ray is adjacent with the high energy x-ray from this x-ray supply system low, irradiating to the suffering inspection body, you collect the projection data.高エネルギーと低エネルギーのX線ビームを高速に切替え可能なX線発生装置及びそれを用いて高速かつ高画質のマルチエネルギー撮影可能なX線CT装置を提供する。二つの陰極200a、200bと、これらの陰極フィラメントから放出される電子ビームによってX線焦点からX線を放射する回転陽極204と、前記電子ビームの放出を制御する二つのグリッド電極202a、202bとを備えたX線管9と、X線の条件を制御する管電圧発生部9a及び管電圧制御部9d1と、フィラメント加熱部9b及び管電流制御部9d2と、グリッド電圧発生部9c及びグリッド開閉制御部9d3と、グリッド切替部9eとを備えてX線発生装置を構成する。このX線発生装置からの高エネルギーX線と低エネルギーX線を隣り合う投影角度毎に切り替えて被検体に照射して投影データを収集する。
