| 摘要 |
A radiation imaging system includes an X-ray source, first and second absorption gratins disposed in a path of X-rays emitted from the X-ray source, and an FPD. The second absorption grating is stepwise slid in an X direction relatively against the first absorption grating. Whenever the second absorption grating is slid, the FPD captures a fringe image and produces image data. A correction section corrects the image data for spatial variation of X-ray transmittance of the first and second absorption gratings. A phase contrast image generator produces a phase contrast image from the corrected image data. An X-ray absorption contrast image generator calculates a value related to an average of the corrected image data on a pixel-by-pixel basis, and produces an X-ray absorption contrast image from the value. |
