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• W4313887346 abstract "Emerging methods of x-ray imaging that capture phase and dark-field effects are equipping medicine with complementary sensitivity to conventional radiography. These methods are being applied over a wide range of scales, from virtual histology to clinical chest imaging, and typically require the introduction of optics such as gratings. Here, we consider extracting x-ray phase and dark-field signals from bright-field images collected using nothing more than a coherent x-ray source and a detector. Our approach is based on the Fokker-Planck equation for paraxial imaging, which is the diffusive generalization of the transport-of-intensity equation. Specifically, we utilize the Fokker-Planck equation in the context of propagation-based phase-contrast imaging, where we show that two intensity images are sufficient for successful retrieval of both the projected thickness and the dark-field signal associated with the sample. We show the results of our algorithm using both a simulated dataset and an experimental dataset. These demonstrate that the x-ray dark-field signal can be extracted from propagation-based images, and that sample thickness can be retrieved with better spatial resolution when dark-field effects are taken into account. We anticipate the proposed algorithm will be of benefit in biomedical imaging, industrial settings, and other non-invasive imaging applications." @default.
• W4313887346 created "2023-01-10" @default.
• W4313887346 creator A5014334670 @default.
• W4313887346 creator A5034929360 @default.
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• W4313887346 date "2023-06-01" @default.
• W4313887346 modified "2023-09-25" @default.
• W4313887346 title "X-ray dark-field and phase retrieval without optics, via the Fokker–Planck equation" @default.
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• W4313887346 doi "https://doi.org/10.1109/tmi.2023.3234901" @default.
• W4313887346 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37018560" @default.
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