| 摘要 |
<p>The present invention prevents image quality from degrading even when misalignment occurs between the relative positions of gratings during fringe scanning. First and second absorptive gratings are disposed between an X-ray source and an X-ray image detector. While the relative positions of the first and second absorptive gratings are being incrementally varied, an image is taken by the X-ray image detector at each relative position. The relative positions are detected by a position sensor. A phase differential image generator generates, on the basis of the detection value of the position sensor, a phase differential image by computing the phase shift of an intensity modulation signal that indicates the intensity variation of pixel data for each pixel. A phase contrast image generator generates a phase contrast image by integrating the phase differential image in the direction of change of the relative positions.</p> |
