微焦点X射线相衬成像相位复原算法研究

Research of phase retrieval method for micro-focus X-ray phase contrast imaging

在不同散度值下获得一系列图像,得到两种不同相位复原算法:一种为基于傅立叶变换求解强度传输方程(TIE)得到物体的相位分布;一种为基于薛定谔波动方程的迭代算法。用数值法模拟研究了两种算法的相衬成像和相位恢复过程,并对两种算法进行了对比。

We develop and compare two different methods of phase retrieval from series of image measurements obtained at different defocus values. One is a solution to the transport of intensity equation （TIE） based on Fourier transforms. Another is an iterative method based on Schr dinger equation. By computer simulation, we study the phase retrieval procedure and give a comparison for two methods.