硬x射线同轴相衬成像相位恢复的模拟

Phase retrieval for hard x-ray in-line phase contrast imaging

分析了硬x射线同轴相衬成像过程,在菲涅耳衍射的基础上,提出了基于强度传播方程(Transport of Intensity equation)的相位恢复算法,并利用数值法模拟研究了相衬成像和相位恢复过程,从而验证了这一相位恢复算法。

In this paper, we analyze hard x-ray in-line phase contrast imaging using Fresnel diffraction of x-ray. Then we propose a linear phase retrieval method based on Transport of Intensity equation （TIE）. According to computer simulation for the process of phase contrast imaging and Phase retrieval, this method is tested on simulated images and is demonstrated to be efficient for phase retrieval in the ＂near-Fresnel＂ region.