In obtaining a long image in the longitudinal direction, the radiation imaging apparatus of the present invention, correction means radiation image based on the region overlapping radiation images between a plurality based on the detected radiation whenever it relatively moves in the same direction image decomposition unit decomposes at a predetermined distance each There is corrected, the above-described radiation image corrected that the projected image of the projection angle for each image synthesizing means synthesizes the projection angles for each of the same image has been its degradation get. Thus, by the reconstruction process means performs reconstruction processing on the basis of the projection image obtained by combining the, that while reducing the luminance difference in the radiation between the different images from each other, to obtain a tomographic image of the field of view long in the longitudinal direction possible.この発明の放射線撮像装置は、長手方向の長尺画像を得る際に、同方向に相対移動する度に検出された放射線に基づく複数の放射線画像同士で重複する領域に基づいて放射線画像を補正手段が補正し、その補正された放射線画像を上述した所定距離ごとに画像分解手段は分解し、その分解された画像を同一の投影角度毎に画像合成手段が合成して投影角度毎の投影画像を得る。したがって、その合成された投影画像に基づいて再構成処理手段が再構成処理を行うことで、互いに異なる放射線画像間での輝度差を低減させつつ、長手方向の長い視野の断層画像を得ることができる。
