AUTHOR=Tao Siwei , He Congxiao , Hao Xiang , Kuang Cuifang , Liu Xu 

TITLE=Factors Affecting the Spatial Resolution in 2D Grating–Based X-Ray Phase Contrast Imaging

JOURNAL=Frontiers in Physics

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.672207

DOI=10.3389/fphy.2021.672207

ISSN=2296-424X

ABSTRACT=<p>X-ray phase contrast imaging is a promising technique in X-ray biological microscopy, as it improves the contrast of images for materials with low electron density compared to traditional X-ray imaging. The spatial resolution is an important parameter to evaluate the image quality. In this paper, simulation of factors which may affect the spatial resolution in a typical 2D grating–based phase contrast imaging system is conducted. This simulation is based on scalar diffraction theory and the operator theory of imaging. Absorption, differential phase contrast, and dark-field images are retrieved <italic>via</italic> the Fourier transform method. Furthermore, the limitation of the grating-to-detector distance in the spatial harmonic method is discussed in detail.</p>