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Related Experiment Video

Updated: Nov 6, 2025

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography

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Published on: September 29, 2019

Generalized reverse projection method for grating-based phase tomography.

Zhao Wu¹, Kun Gao¹, Zhili Wang²

¹National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China.

Journal of Synchrotron Radiation

|May 5, 2021

Summary

This summary is machine-generated.

A new generalized reverse projection method enhances grating-based phase tomography by overcoming field-of-view limitations. This advancement enables faster, dose-constrained imaging with improved applicability in phase-contrast imaging systems.

Keywords:

X-ray phase contrast computed tomography phase retrieval reverse projection

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Area of Science:

Medical Imaging
X-ray Imaging
Computational Imaging

Background:

Grating-based phase-contrast imaging offers high sensitivity.
Conventional reverse projection methods require uniform gratings, limiting the field of view.
Existing methods rely on synchronous phase shifting assumptions.

Purpose of the Study:

To develop a generalized reverse projection method for grating-based phase tomography.
To address limitations imposed by non-uniform reference phase shifts.
To enable fast and dose-constrained imaging in phase tomography.

Main Methods:

Analytical derivation of a generalized reverse projection algorithm.
Numerical simulations to validate the method.
Synchrotron radiation experiments for practical demonstration.

Main Results:

The generalized method successfully handles non-uniform reference phase shifts.
Demonstrated independence from strict uniformity and alignment requirements.
Analysis of imaging position effects on sensitivity and phase wrapping.

Conclusions:

The proposed method combines the efficiency of reverse projection with the versatility of phase-stepping.
It overcomes field-of-view limitations in grating-based phase tomography.
The method is expected to find wide application in advanced imaging scenarios.