PROBLEM TO BE SOLVED: To sufficiently reduce effect of scattered light and suppress effect of variations in strength and distribution of a plurality of radiation beams in a radiographic imaging apparatus having a plurality of radiation sources.SOLUTION: Fan beams of radiation are output from multiple radiation sources 1a. Radiation is output simultaneously only from a part of the radiation sources 1a having irradiation ranges that neither overlap with each other nor are adjacent to each other. Image correction data is obtained by irradiating the radiographic image detector with radiation while the groups of radiation sources are sequentially switched in a state in which a subject is not present. An effective area having a value higher than a predetermined threshold is determined for each image correction data. The radiographic image detector is irradiated with radiation in a state in which a subject is set while groups of radiation sources are sequentially switched. Radiation image data obtained based on the effective area, which corresponds to each of the groups of radiation sources, is corrected based on the image correction data.COPYRIGHT: (C)2010,JPO&INPIT【課題】放射線源を複数備えた放射線画像撮影装置において、散乱線の影響を十分に除去するとともに、複数の放射線の強度と分布のばらつきの影響を抑制する。【解決手段】多数の放射線源1aからファンビームの放射線を射出させるとともに、放射線の照射範囲が重畳または隣接しないような一部の放射線源1aの群からのみ同時に放射線を射出させるようにし、被写体が存在しない状態において、放射線源の群を順次切り替えて放射線を放射線画像検出器に照射することにより各画像補正データを取得し、各画像補正データのそれぞれについて、所定の閾値よりも高い値の有効領域を決定し、被写体を設置した状態において、放射線源の群を順次切り替えて放射線を放射線画像検出器に順次照射し、有効領域に基づいて取得した各放射線源の群に対応する各放射線画像データを上記各画像補正データに基づいて補正する。【選択図】図1
