Patent ID: 7615756

Claim:
An apparatus for capturing a radiation image, comprising: a radiation source for emitting a radiation to be applied to a subject; a radiation detector for detecting the radiation which has passed through said subject, said radiation detector including an exposure area for being irradiated with said radiation and an non-exposure area for being not irradiated with said radiation; corrective image data acquiring means for acquiring unexposed image data RO and non-exposure image data rO respectively from said exposure area and said non-exposure area, as corrective image data, while said radiation detector is not being irradiated with said radiation; and exposed image data correcting means for acquiring exposed image data Rn and non-exposure image data rn respectively from said exposure area and said non-exposure area while said radiation detector is being irradiated with said radiation through said subject, adjusting said unexposed image data RO according to a variation of said non-exposure image data rn with respect to said non-exposure image data rO, and correcting said exposed image data Rn based on the adjusted unexposed image data RO, wherein said exposed image data correcting means adjusts said unexposed image data RO according to a variation of an average value of said non-exposure image data rn with respect to an average value of said non-exposure image data rO.