PROBLEM TO BE SOLVED: To easily perform long-length imaging to place an alignment marker always in an overlapping area of an X-ray flat panel detector (FPD) regardless of the range of the long-length imaging or the position of an X-ray source.SOLUTION: The whole area of the position where the alignment marker set on a screen is projected on the FPD is set in advance as a fixed overlapping area (Ctop-Cbottom) according to the range of the long-length imaging or the position of the X-ray source. In determining a plurality of field-of-view areas when the range of the long-length imaging is divided into a plurality of sections for the radiography, the field-of-view areas (FOVNT-FOVNB) and FPD positions PN corresponding to the respective field-of-view areas are determined so that the set fixed overlapping areas overlap in the adjacent field-of-view areas. By controlling the height of the X-ray source, the X-ray irradiation direction, the collimator aperture angle and the FPD position so as to apply X rays only to each of the determined field-of-view areas, the marker can be always projected to the fixed overlapping area of the FPD regardless of the range of the long-length imaging or the position of the X-ray source.COPYRIGHT: (C)2010,JPO&INPIT【課題】長尺撮影範囲やX線源の位置に関わらず、常に位置合わせ用のマーカーをX線平面検出器(FPD)の重複領域に入れる長尺撮影を容易に実現できるようにする。【解決手段】長尺撮影範囲やX線源の位置に応じて、衝立に設けられた位置合わせ用のマーカーがFPD上に投影される位置の全域を、予め固定重複領域(Ctop~Cbottom)として設定する。長尺撮影時の撮影範囲を複数に分割して撮影する際の複数の照射野領域を決定する際に、隣接する照射野領域間で前記設定した固定重複領域が重複するように各照射野領域(FOVNT~FOVNB)及び各照射野領域に対応するFPD位置PNを決定する。前記決定された各照射野領域のみにX線が照射されるようにX線源の高さ、X線照射方向、コリメータ絞り角、及びFPD位置を制御することにより、長尺撮影範囲やX線源の位置に関わらず、常にマーカーをFPDの固定重複領域に投影可能にする。【選択図】 図3
