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Single-image phase retrieval for hard X-ray grating interferometry.

Zhili Wang1, Kun Ren1, Xiaomin Shi1

  • 1School of Electronic Science and Applied Physics, Hefei University of Technology, Anhui 230009, People's Republic of China.

Journal of Synchrotron Radiation
|January 19, 2019
PubMed
Summary
This summary is machine-generated.

A new single-image method simplifies hard X-ray grating interferometry for quantitative phase retrieval. This technique reduces data collection time and improves image quality, making it ideal for in vivo imaging and phase tomography.

Keywords:
X-ray imaginggrating interferometryphase retrievalphase-contrast imaging

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Area of Science:

  • Physics
  • Materials Science
  • Medical Imaging

Background:

  • Quantitative phase retrieval is crucial for analyzing materials using X-rays.
  • Traditional methods like phase-stepping require multiple images, increasing acquisition time and complexity.
  • Artifacts in phase images can hinder accurate interpretation and processing.

Purpose of the Study:

  • To develop a single-image quantitative phase retrieval method for hard X-ray grating interferometry.
  • To validate the proposed method using synchrotron radiation experiments.
  • To improve upon existing phase retrieval techniques by simplifying acquisition and enhancing image quality.

Main Methods:

  • Theoretical derivation of a novel single-image quantitative phase retrieval algorithm.
  • Assumption of quasi-homogeneous samples with a constant ratio between the real and imaginary parts of the complex refractive index.
  • Validation through synchrotron radiation experiments, comparing results with the phase-stepping method.

Main Results:

  • Successful retrieval of phase images directly, bypassing the need for derivative calculations.
  • Significant suppression of stripe artifacts commonly found in integrated phase images.
  • Demonstrated advantage over phase-stepping methods through simplified acquisition and reduced data collection times.
  • Robustness against noise was observed.

Conclusions:

  • The proposed single-image method offers a simplified and faster approach to quantitative phase retrieval in hard X-ray grating interferometry.
  • Direct retrieval of phase images and artifact suppression enhance image quality for better interpretation and processing.
  • The method's efficiency and robustness make it suitable for demanding applications like in vivo imaging and phase tomography.