PROBLEM TO BE SOLVED: To increase readout efficiency when reading out radiation images recorded in a detecting panel by radiation imaging in a radiation CT apparatus.SOLUTION: By an imaging section 20 including a radiation source 22 and a detecting panel 24 arranged to face each other with a rotating axis C1 that passes through a predetermined position 5 interposed therebetween, and a rotating section 26 for integrally rotating the radiation source 22 and the detecting panel 24 around the rotating axis C1, while sequentially imaging the radiation image of a subject 1A placed at the predetermined position 5 while rotating the radiation source 22 and the detecting panel 24 around the rotating axis C1, image signals recorded in detection pixels configuring the detecting panel 24 are read out for each imaging operation by a readout section 30. A control section 38 refers to a setting result of a necessary readout region and controls a readout switching section 34 such that the image signals belonging to the necessary readout region 24A are read out by a normal readout section 31N and the image signals belonging to an unnecessary region 24B are read out by a high speed readout section 31F.COPYRIGHT: (C)2010,JPO&INPIT【課題】放射線CT装置において、放射線撮影により検出パネルに記録された放射線画像を読み出すときの読出効率を高める。【解決手段】所定位置5を通る回転軸C1を間に挟んで対向配置された放射線源22と検出パネル24、および回転軸C1の周りに放射線源22と検出パネル24とを一体的に回転させる回転部26を有してなる撮影部20により、回転軸C1の回りに放射線源22と検出パネル24とを回転させつつ、所定位置5に配された被写体1Aの放射線像を連続撮影しながら、各撮影毎に、読出部30により検出パネル24を構成する検出画素に記録された画像信号を読み出す。制御部38が、設定部72による読出必要領域の設定結果を参照して、読出必要領域24Aに属する画像信号を通常読出部31Nで読み出し、不要領域24Bに属する画像信号を高速読出部31Fで読出すように読出切換部34を制御する。【選択図】図2
