PROBLEM TO BE SOLVED: To provide a technique which can reduce the quantity of an object exposed to an X-ray and make an X-ray detecting surface compact.SOLUTION: In an X-ray imaging apparatus for carrying out an X-ray CT image recording, under a state that an X-ray generator 13 for generating an X-ray cone beam BX1 is opposed to an X-ray detector 21 for detecting the X-ray cone beam BX1 applied to the object with the object (specifically, the image object OB) held between them, the X-ray generator 13 and the X-ray detector 21 are turned by 180o. While the X-ray generator 13 and the X-ray detector 21 are turned by 180o, the X-ray generator 13 is moved so as to move a turning reference point CP set on an optical axis CB of the X-ray cone beam BX1 on a prescribed ellipse for one round. Thus, a CT image area CA to be imaged by applying the X-ray cone beam BX1 is set to be substantially triangular.COPYRIGHT: (C)2012,JPO&INPIT【課題】被写体のX線被曝量を低減しつつ、X線検出面の小型化を実現し得る技術を提供すること。【解決手段】X線CT撮影を行うX線撮影装置において、X線コーンビームBX1を発生するX線発生器13と、被写体に照射されたX線コーンビームBX1を検出するX線検出器21とを被写体(具体的には、撮影対象物OB)を挟んで対向させた状態で180度旋回させる。さらに、この180度旋回させる間に、X線コーンビームBX1の光軸CB上に設定される旋回基準点CPを所定の楕円形上を1周分描く様に、X線発生器13を移動させる。これにより、X線コーンビームBX1の照射により撮影されるCT撮影領域CAが略三角形状となるように設定する。【選択図】図11
