Higher-order Reconstruction Method of Differential Phase Shift

TL;DR

This paper introduces a higher-order phase retrieval method for x-ray differential phase shift imaging, improving accuracy over traditional linear models and enabling more precise reconstructions in complex scenarios.

Contribution

The paper presents a novel higher-order reconstruction approach that relaxes weak absorption assumptions and simplifies phase retrieval to a linear inverse problem.

Findings

Demonstrates improved accuracy over linear approximation models

Shows stability and robustness through numerical studies

Eliminates nonlinear terms in phase and attenuation

Abstract

In this paper, we develop a novel phase retrieval approach to reconstruct x-ray differential phase shift induced by an object. A primary advantage of our approach is a higher-order accuracy over that with the conventional linear approximation models, relaxing the current restriction of weak absorption and slow phase variation scenario. The optimal utilization of the diffraction images at different distance in Fresnel diffraction region eliminates the nonlinear terms in phase and attenuation, and simplifies the reconstruction to a linear inverse problem. Numerical studies are also described to demonstrate the accuracy and stability of our approach.