title: Analysis of polychromaticity effects in X-ray Talbot interferometer.
abstract: The influence of polychromaticity of the X-ray source on the performance of an X-ray Talbot interferometer applied for phase-contrast imaging is analyzed through numerical simulations based on the Fresnel diffraction theory. The presented simulation results show that the visibility of the self-image is fairly insensitive to the source polychromaticity and explain why the interferometer could be well combined with polychromatic X-ray sources in recent experiments. Furthermore, the self-image with a high visibility can be obtained under polychromatic illumination even at a high-order fractional Talbot distance. This fact implies that the acquired image quality for phase measurements can be improved, since the primary signal for phase measurement is proportional to the inter-grating distance. Finally, we mention that the results are also valid for Talbot-Lau interferometer and scanning double-grating configuration.
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Zhili
authors.initials: Z
authors.lastname: Wang
authors.forename: Peiping
authors.initials: P
authors.lastname: Zhu
authors.forename: Wanxia
authors.initials: W
authors.lastname: Huang
authors.forename: Qingxi
authors.initials: Q
authors.lastname: Yuan
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Liu
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.forename: Youli
authors.initials: Y
authors.lastname: Hong
authors.forename: Huitao
authors.initials: H
authors.lastname: Zhang
authors.forename: Xin
authors.initials: X
authors.lastname: Ge
authors.forename: Kun
authors.initials: K
authors.lastname: Gao
authors.forename: Ziyu
authors.initials: Z
authors.lastname: Wu
mesh_terms: D003952:Diagnostic Imaging / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D007368:Interferometry / Q000379:methods*; D008962:Models, Theoretical; D014965:X-Rays