Method and apparatus for obtaining radiation image data

摘要

In a radiation image data obtaining method and a radiation image data obtaining apparatus, quality degradation at the periphery of an image is prevented after subtraction processing. Radiation emitted from a radiation source and having passed through a subject is irradiated onto a detector. An image signal in accordance with the intensity of the radiation is output from a detection layer at the front. Meanwhile, a portion of the radiation which has not been converted into visible light by a scintillator out of the radiation irradiated onto the detection layer passes through the detection layer and reaches another detection layer at the rear. An image signal is output from the layer at the rear. The image signal from the rear is input to size correction means and a size correction operation is carried out in the means so that the sizes of images represented by the image signal from the front and an image signal after the correction agree.