Motionless Phase Stepping in X-Ray Phase Contrast Imaging with a Compact Source

TL;DR

This paper introduces an electromagnetic phase stepping method for X-ray phase contrast imaging that replaces mechanical motion, enabling faster, more accurate, and more flexible imaging suitable for clinical applications.

Contribution

The authors develop a novel electromagnetic phase stepping technique that eliminates the need for mechanical movement in X-ray phase contrast imaging.

Findings

Electromagnetic phase stepping removes mechanical constraints.

Method applicable to projection and tomography modes.

Facilitates clinical translation of phase contrast imaging.

Abstract

X-ray phase contrast imaging offers a way to visualize the internal structures of an object without the need to deposit any radiation, and thereby alleviate the main concern in x-ray diagnostic imaging procedures today. Grating-based differential phase contrast imaging techniques are compatible with compact x-ray sources, which is a key requirement for the majority of clinical x-ray modalities. However, these methods are substantially limited by the need for mechanical phase stepping. We describe an electromagnetic phase stepping method that eliminates mechanical motion, and thus removing the constraints in speed, accuracy and flexibility. The method is broadly applicable to both projection and tomography imaging modes. The transition from mechanical to electromagnetic scanning should greatly facilitate the translation of x-ray phase contrast techniques into mainstream applications.