PROBLEM TO BE SOLVED: To provide a medical X-ray imaging apparatus which reduces radiation exposure of a subject by restricting the X-ray irradiation area of the subject in a direction intersecting with a scan direction of X-ray beams in accordance with a photographing region in X-ray imaging for performing X-ray imaging by scanning the subject with X-ray beams.SOLUTION: In the medical X-ray imaging apparatus including a supporting member for supporting an X-ray generator and an X-ray detector with the subject in between, an irradiation field restricting part for restricting the irradiation field of the X-ray beams generated from the X-ray generator, and a scan driving part for scanning the subject with the X-ray beams restricted by the irradiation field restricting part for performing the X-ray imaging, an X-ray irradiation position changing part which changes a position irradiated with the X-ray beams to a height direction being a direction intersecting with the scan direction of the X-ray beams in accordance with the photographing region of the subject during the scan with the X-ray beams is provided.COPYRIGHT: (C)2011,JPO&INPIT【課題】X線ビームを被写体に走査してX線撮影を行うX線撮影において、撮影部位に対応して被写体へのX線照射領域を、X線ビームの走査方向に対して交差する方向で制限して、被写体への被曝量を低減できる医療用X線撮影装置を提供することを目的とする。【解決手段】X線発生器とX線検出器とを被写体を挟んで対向させて支持する支持部材と、X線発生器から発生したX線ビームの照射野を規制する照射野規制部と、照射野規制部で規制されたX線ビームを被写体に対して走査させてX線撮影を行わせる走査駆動部とを備えた医療用X線撮影装置であって、X線ビームの走査中に、X線ビームの照射位置を、被写体の撮影部位に応じて、X線ビームの走査方向と交差する方向である高さ方向に変更させるX線照射位置変更部を備えている。【選択図】図1
