PROBLEM TO BE SOLVED: To suppress an exposure dosage and to achieve uniform density of each radiation image in radiography that obtains a long radiation image by photographing the radiation image in each region while sequentially moving a radiation detector to multiple regions adjoining to a subject.SOLUTION: In performing radiography of each region N1, N2, ..., visible light image of each region N1, N2, ... is photographed, a photographed portion of the subject N included in the visible light image is recognized, a radiation dose of a radiation source is set so that concentration of each radiation image is uniform based on a recognized result of the photographed portion, and the radiation image of each region N1, N2, ... is synthesized so as to generate the long radiation image exhibiting the entire subject N.COPYRIGHT: (C)2013,JPO&INPIT【課題】放射線検出器を被写体中の隣接する複数の領域に順次移動させつつ、各領域の放射線画像を撮影して長尺な放射線画像を得る放射線撮影において、被曝量を抑えつつ、各放射線画像の濃度を均一にする。【解決手段】各領域N1,N2…の放射線撮影をする際に、各領域N1,N2…の可視光画像を撮影し、可視光画像に含まれる被写体Nの撮影部位を認識し、撮影部位の認識結果に基づいて、各放射線画像の濃度が均一となるように、放射線源の照射線量を設定して各領域N1,N2…の放射線画像を合成して被写体Nの全体を表す長尺放射線画像を生成する。【選択図】図1
