PROBLEM TO BE SOLVED: To obtain a radiographic image with high image quality by reducing the influence of moire to be generated by a positional deviation between a radiation image detector and first and second gratings in a radiographic apparatus where the radiation image detector or the first and the second gratings are structured in such a manner to be attachable to the radiographic apparatus and detachable therefrom.SOLUTION: The radiographic apparatus where the radiation image detector and the first and the second gratings are structured in such a manner to be attachable to the radiographic apparatus and detachable therefrom includes: a cassette attachment/detachment detection unit 63 that detects attachment and detachment of the radiation image detector a grid attachment/detachment detection unit 64 that detects attachment and detachment of the first and second gratings and a preliminary irradiation control unit 60a that controls a radiation source so that preliminary irradiation for detecting a relative positional deviation between the first and the second gratings and the radiation image detector is performed when attachment or detachment of the first and second gratings or the radiation image detector has been detected.COPYRIGHT: (C)2012,JPO&INPIT【課題】放射線画像検出器または第1および第2の格子が着脱可能な構成の放射線画像撮影装置において、放射線画像検出器と第1および第2の格子との間の位置ずれによって生じるモアレの影響を低減し、高画質な放射線画像を取得する。【解決手段】第1および第2の格子および放射線画像検出器を着脱可能に構成し、放射線画像検出器の着脱を検出するカセッテ着脱検出部63と、第1および第2の格子の着脱を検出するグリッド着脱検出部64と、第1および第2の格子または放射線画像検出器の着脱が検出された際、第1および第2の格子と放射線画像検出器との相対的な位置ずれを検出するためのプレ曝射を行うよう放射線源を制御するプレ曝射制御部60aとを設ける。【選択図】図6
