PROBLEM TO BE SOLVED: To establish in high precision an optimal dosage irradiated on an interested region of an object.SOLUTION: A radiation image information of a mammo 44 is acquired by a solid detector 46 from radiation rays X irradiated and transmitted from a radiation ray source 74. The detected value detected from a region including the interested region by the solid detector 46 is compared with a prescribed threshold for identifying the interested region, and a detection correction value is calculated based on the region including the identified interested region and the detection value of the interested region. The radiation dosage detected by AEC sensors 49a-49f is corrected by an AEC correction part 78 based on the detection correction value, and irradiation control conditions are determined according to an imaging portion of the object based on the corrected radiation dosage.COPYRIGHT: (C)2008,JPO&INPIT【課題】被写体の関心領域に曝射される最適な放射線量を高精度に設定することを可能とする。【解決手段】放射線源74から曝射され、透過した放射線Xからマンモ44の放射線画像情報を固体検出器46で取得し、固体検出器46により関心領域を含む領域から検出した検出値を、関心領域を特定するための所定の閾値と比較し特定した関心領域を含む領域と関心領域の検出値に基づいて検出補正値を算出し、前記検出補正値に基づいてAECセンサ49a~49fで検出した放射線量をAEC補正部78で補正し、補正された放射線量に基づいて曝射制御条件を被写体の撮像部位に応じて決定する。【選択図】図4
