Analysis of polychromaticity effects in X-ray Talbot interferometer
Analysis of polychromaticity effects in X-ray Talbot interferometer
复制标题
DOI：
10.1007/s00216-010-3640-9
复制
发表时间：
2010-04
影响因子：
4.3
通讯作者：
Zhili Wang;P. Zhu;Wanxia Huang;Q. Yuan;Xiaosong Liu;Kai Zhang;Youli Hong;Huitao Zhang;Xin G
中科院分区：
文献类型：
--
作者：
Zhili Wang;P. Zhu;Wanxia Huang;Q. Yuan;Xiaosong Liu;Kai Zhang;Youli Hong;Huitao Zhang;Xin G
基于菲涅耳衍射理论，通过数值模拟，分析了X射线源的多色性对X射线塔尔博特干涉仪相衬成像性能的影响。所提出的模拟结果表明，自图像的可见性是相当不敏感的源多色性和解释为什么干涉仪可以很好地结合在最近的实验中的多色X射线源。此外，即使在高阶分数塔尔博特距离下，在多色照明下也可以获得具有高可见度的自像。这一事实意味着可以改善用于相位测量的所获取的图像质量，因为用于相位测量的主信号与光栅间距离成比例。最后，我们提到，结果也适用于Talbot-Lau干涉仪和扫描双光栅配置。
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.