Spectral X-ray dark-field signal characterization from dual-energy projection phase-stepping data with a Talbot-Lau interferometer

Material-selective analysis of spectral X-ray imaging data requires prior knowledge of the energy dependence of the observed signal. Contrary to conventional X-ray imaging, where the material-specific attenuation coefficient is usually precisely known, the linear diffusion coefficient of the X-ray d...

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Bibliographic Details
Published in:Scientific reports 2023-01, Vol.13 (1), p.767-8, Article 767
Main Authors: Taphorn, Kirsten, Kaster, Lennard, Sellerer, Thorsten, Hötger, Alexander, Herzen, Julia
Format: Article
Language:English
Subjects:
639/624/400/1106
639/766/930/2735
Diffusion coefficient
Energy
Foams
Humanities and Social Sciences
Microstructure
multidisciplinary
Optimization
Physics
Science
Science (multidisciplinary)
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Summary:Material-selective analysis of spectral X-ray imaging data requires prior knowledge of the energy dependence of the observed signal. Contrary to conventional X-ray imaging, where the material-specific attenuation coefficient is usually precisely known, the linear diffusion coefficient of the X-ray dark-field contrast does not only depend on the material and its microstructure, but also on the setup geometry and is difficult to access. Here, we present an optimization approach to retrieve the energy dependence of the X-ray dark-field signal quantitatively on the example of closed-cell foams from projection data without the need for additional hardware to a standard grating-based X-ray dark-field imaging setup. A model for the visibility is used to determine the linear diffusion coefficient with a least-squares optimization. The comparison of the results to spectrometer measurements of the linear diffusion coefficient suggests the proposed method to provide a good estimate for the energydependent dark-field signal.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-27155-1