Large-field phase contrast imaging method based on detuning configuration including acquisition and reconstruction techniques

摘要

X-ray grating interferometer comprising a phase difference digital imaging system such as a Talbot-Lau interferometer system, an X-ray source and X-ray detector for radiography, a beam forming device, a phase grating (G1) and an analysis grating (G2) And an embodiment of a method and apparatus for obtaining a phase contrast digital imaging system that can comprise an X-ray detector. Here, the source grating (G0), the phase grating (G1), and the analysis grating (G2) are detuned, and a plurality of uncorrelated reference images are taken for image processing by the detuning system. The phase grating (G1), the analysis grating (G2) and the X-ray detector have relative positions that remain fixed to each other, and the interferometer and the sample to be imaged are scanned relative to each other. Since the interferometer is detuned, moiré fringes are formed on the detector, and the scanning range of the interferometer covers the entire period of the moiré fringes.