Predicting fringe visibility in dual-phase grating interferometry with polychromatic X-ray sources

Article type: Research Article

Authors: Yan, Aimin^a | Wu, Xizeng^{a; *} | Liu, Hong^b

Affiliations: [a] Department of Radiology University of Alabama at Birmingham Birmingham, AL, USA | [b] Center for Bioengineering School of Electrical and Computer Engineering University of Oklahoma Norman, OK, USA

Correspondence: [*] Corresponding author: Department of Radiology, University of Alabama at Birmingham, Birmingham, AL 35249, USA. E-mail: xwu@uabmc.edu.

Abstract: Dual phase grating X-ray interferometry is radiation dose-efficient as compared to common Talbot-Lau grating interferometry. The authors developed a general quantitative theory to predict the fringe visibility in dual-phase grating X-ray interferometry with polychromatic X-ray sources. The derived formulas are applicable to setups with phase gratings of any phase modulation and with either monochromatic or polychromatic X-rays. Numerical simulations are presented to validate the derived formulas. The theory provides useful tools for design optimization of dual-phase grating X-ray interferometers.

Keywords: X-ray imaging, X-ray interferometry

DOI: 10.3233/XST-200726

Journal: Journal of X-Ray Science and Technology, vol. 28, no. 6, pp. 1055-1067, 2020