Patent ID: 8632247

Claim:
An X-ray radiation imaging system comprising: a first grating for passing X-ray radiation emitted from an X-ray radiation source and producing a first fringe image; an intensity modulator for applying intensity modulation to the first fringe image and producing a second fringe image in each of plural relative positions out of phase with one another with respect to a periodic pattern of the first fringe image; an X-ray radiation image detector for detecting the second fringe image; an image processor for producing a phase contrast image of an object disposed between the X-ray radiation source and the X-ray radiation image detector based on a plurality of the second fringe images detected by the X-ray radiation image detector; and a positional deviation detector for detecting a positional deviation between the first grating and the intensity modulator, the positional deviation detector obtaining an intensity modulation signal from the plural second fringe images on a pixel-by-pixel basis, and evaluating the positional deviation based on a characteristic value of the intensity modulation signal.