| 摘要 |
An air grid is constructed such that absorbing foil strips, which absorb scattered X-rays, are arranged in a direction parallel to the direction of rows of detecting elements, and that spacing between adjacent shadows among shadows of the absorbing foil strips formed on a flat panel X-ray detector (FPD) as a result of the absorbing foil strips absorbing X-rays is larger than spacing between pixels forming an X-ray image. An image data acquiring unit, a transmittance smoothing unit, a grid data acquiring unit, a shadowless pixel calculating unit, a shadow total quantity calculating unit, a transmittance correcting unit and an X-ray image acquiring unit are provided to remove the shadows with high accuracy by using corrected image data (X-ray transmittances) which constitutes a profile of shadows occurring at an actual time of X-ray imaging of a subject.
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