Analysis of polychromaticity effects in X-ray Talbot interferometer

Zhili Wang; Peiping Zhu; Wanxia Huang; Qingxi Yuan; Xiaosong Liu; Kai Zhang; Youli Hong; Huitao Zhang; Xin Ge; Kun Gao; Ziyu Wu
July 2010
Analytical & Bioanalytical Chemistry;Jul2010, Vol. 397 Issue 6, p2137
Academic Journal
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.


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