PROBLEM TO BE SOLVED: To provide a technique to improve both the image quality of a radiation image and the operability of a radiation imaging apparatus.SOLUTION: In the present invention, three or more unirradiated images are obtained before capturing a radiation image, and a temporal change in the amount of electric charges in each pixel is approximated using a non-linear function. At this time, the amount of residual electric charges is determined by evaluating a coefficient of determination of an approximate equation, and the most appropriate offset correction processing method is selected in accordance with the status of the determination.COPYRIGHT: (C)2014,JPO&INPIT【課題】 放射線画像の高画質化と放射線撮像装置の操作性の向上とを両立させるための技術を提供する。【解決手段】 放射線画像の撮影前に3枚以上の無曝射画像を取得し、各画素の電荷量の時間変化を非線形関数で近似する。その際、近似式の決定係数を評価することで、残留電荷の多寡を判定し、状態に応じて最適なオフセット補正処理の方法に切り替える。【選択図】 図1
