Problem to be solved: to provide a radiation image processing apparatus, a method of operating the same, and a radiation image processing program capable of estimating and removing a scattered line in a direct radiation area based on the radiation directly arriving at the radiation detecting portion without transmitting the subject, and removing the radiation.In the radiation image, a region detection image is obtained by detecting a direct radiation region RD in which the radiation passes through the subject h and reaches the radiation detecting part, and the direct radiation area Rd which has reached the radiation detecting part without passing through the subject h passes through the subject region RH.Based on the region detection image and scattered line spread information concerning the spread of the scattered line, a scattered line image of the scattered ray component is obtained.By subtracting the scattered image from the radiation image, a radiation image which has been removed from the scattered ray component is obtained.Diagram【課題】被写体を透過せずに、直接的に放射線検出部に到達した放射線に基づく直接放射線領域の散乱線を推定し、除去することができる放射線画像処理装置及びその作動方法並びに放射線画像処理プログラムを提供する。【解決手段】放射線画像のうち、放射線が被写体Ｈを透過して放射線検出部に到達した被写体領域ＲＨと、放射線が被写体Ｈを透過せずに放射線検出部に直接的に到達した直接放射線領域ＲＤを検出して領域検出画像を得る。領域検出画像と、散乱線の広がりに関する散乱線広がり情報とに基づいて、散乱線成分に関する散乱線画像を得る。放射線画像から散乱線画像を減算することにより、散乱線成分除去済みの放射線画像を得る。【選択図】図６
