1. Single-exposure X-ray dark-field imaging via a dual-energy propagation-based setup
- Author
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Ahlers, Jannis N., Pavlov, Konstantin M., Kitchen, Marcus J., Harker, Stephanie A., Pryor, Emily J., Pollock, James A., Croughan, Michelle K., How, Ying Ying, Zdora, Marie-Christine, Costello, Lucy F., O'Connell, Dylan W., Hall, Christopher, and Morgan, Kaye S.
- Subjects
Physics - Optics ,Physics - Medical Physics - Abstract
X-ray dark-field imaging visualises scattering from sample microstructure, and has found application in medical and security contexts. While most X-ray dark-field imaging techniques rely on masks, gratings, or crystals, recent work on the Fokker--Planck model of diffusive imaging has enabled dark-field imaging in the propagation-based geometry. Images captured at multiple propagation distances or X-ray energies can be used to reconstruct dark-field from propagation-based images but have previously required multiple exposures. Here, we show single-exposure dark-field imaging by exploiting the harmonic content in a monochromatised synchrotron beam and utilising an energy-discriminating photon-counting detector to capture dual-energy propagation-based images. The method is validated by filming time-varying samples, showing the advantage of the dark-field contrast in analysing dynamic evolution. We measure and adjust for the impact of detector charge-sharing on the images. This work opens the way for low-dose and dynamic dark-field X-ray imaging without the need for a high-stability set-up and precision optics., Comment: 9 pages, 7 figures
- Published
- 2024