PROBLEM TO BE SOLVED: To provide a radiation imaging apparatus capable of accurately preventing erroneous detection of irradiation start of radiation when detecting the irradiation start of the radiation by the radiation imaging apparatus itself.SOLUTION: The control means 22 of the radiation imaging apparatus 1 makes a read circuit 17 perform a read operation in the state of turning respective switch means 8 to an off state by applying an off voltage from a scanning drive means 15 to all scanning lines 5, makes the read processing of leak data dleak be repeatedly performed before radiation imaging, detects that irradiation with the radiation is started at the point of time at which the read leak data dleak exceeds a threshold dleak_th, and performs detection processing of the irradiation start of the radiation for only the leak data dleak read from the respective read circuits 17 incorporated in a read IC 16 other than the read IC 16 specified beforehand among all the read IC 16 in which the read circuits 17 are incorporated.COPYRIGHT: (C)2013,JPO&INPIT【課題】放射線画像撮影装置自体で放射線の照射開始を検出する場合に、放射線の照射開始の誤検出を的確に防止することが可能な放射線画像撮影装置を提供する。【解決手段】放射線画像撮影装置1の制御手段22は、放射線画像撮影前に、走査駆動手段15から全ての走査線5にオフ電圧を印加して各スイッチ手段8をオフ状態とした状態で読み出し回路17に読み出し動作を行わせてリークデータdleakの読み出し処理を繰り返し行わせ、読み出したリークデータdleakが閾値dleak_thを越えた時点で放射線の照射が開始されたことを検出するとともに、読み出し回路17が内蔵された全ての読み出しIC16のうち、予め指定された読み出しIC16以外の読み出しIC16に内蔵された各読み出し回路17から読み出されたリークデータdleakのみを対象として放射線の照射開始の検出処理を行う。【選択図】図7
