Patent ID: 7753586

Claim:
A radiation imaging apparatus comprising: radiation irradiating means; two-dimensional radiation detector including pixels, arranged in row and column directions, for converting radiation to charges, and readout means for reading out the charges as image signals; an anti-scatter grid arranged between the radiation irradiating means and the two-dimensional radiation detector, the anti-scatter grid including a plurality of radiation shielding plates arranged parallel to a pixel column including a plurality of pixels and for each of the plurality of pixel columns; and correction calculation means for correcting the image signal read out from a shielded pixel column including one or a plurality of pixel columns projected with a shade of the radiation shielding plate based on the image signal read out from the plurality of pixel columns adjacent in the row direction with respect to the shielded pixel column, wherein the correction calculation means further includes scattered radiation distribution estimating means for estimating a scattered radiation distribution entering the two-dimensional radiation detector based on the image signals read out from the shielded pixel column, and means for removing an estimated transmitted scattering component based on the estimated scattered radiation distribution from the image signals read out from at least one part of the pixels.