Patent ID: 9717470
Date: 2017-08-01
CPC Classifications: A61B,G01N

Claim:
1. An X-ray imaging system for differential phase contrast imaging, the system comprising: a differential phase contrast setup with: a processor; and a translation arrangement for translating the source grating; wherein: the phase grating, the analyzer grating and the detector are provided as a rigid interferometer, in which the phase grating and the analyzer grating are mounted in parallel to each other; the source grating is misaligned in respect to the interferometer such that moiré fringes are detectable in the plane of the detector; the processor is configured to detect moiré patterns in signals provided by the detector upon X-ray radiation; and the processor is further configured to compute a translation signal for translating the source grating for achieving a predetermined moiré pattern; and the translation arrangement is configured to adjust the positioning of the source grating at least in the X-ray projection direction, based on the value of the translation signal for misaligning the source grating such that at least 2 pi of phase changes are covered with the moiré fringes over the width of the detector.