Pelliccia Daniele, Rigon Luigi, Arfelli Fulvia, Menk Ralf-Hendrik, Bukreeva Inna, Cedola Alessia
School of Physics, Monash University, VIC 3800, Australia.
Opt Express. 2013 Aug 12;21(16):19401-11. doi: 10.1364/OE.21.019401.
A three-image method to extract absorption, refraction and scattering information for hard x-ray grating interferometry is presented. The method comprises a post-processing approach alternative to the conventional phase stepping procedure and is inspired by a similar three-image technique developed for analyzer-based x-ray imaging. Results obtained with this algorithm are quantitatively comparable with phase-stepping. This method can be further extended to samples with negligible scattering, where only two images are needed to separate absorption and refraction signal. Thanks to the limited number of images required, this technique is a viable route to bio-compatible imaging with x-ray grating interferometer. In addition our method elucidates and strengthens the formal and practical analogies between grating interferometry and the (non-interferometric) diffraction enhanced imaging technique.
提出了一种用于硬X射线光栅干涉测量的提取吸收、折射和散射信息的三图像方法。该方法包括一种后处理方法，它是传统相移过程的替代方法，其灵感来自于为基于分析仪的X射线成像开发的类似三图像技术。用该算法获得的结果在定量上与相移相当。该方法可以进一步扩展到散射可忽略不计的样品，在这种情况下，仅需要两幅图像来分离吸收和折射信号。由于所需图像数量有限，该技术是利用X射线光栅干涉仪进行生物兼容成像的可行途径。此外，我们的方法阐明并加强了光栅干涉测量与（非干涉）衍射增强成像技术之间的形式和实际类比。
