X-ray dark-field via spectral propagation-based imaging

  • Ahlers J
  • Pavlov K
  • Kitchen M
  • et al.
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Abstract

Dark-field X-ray imaging visualizes scattering from unresolved microstructure. Most dark-field imaging techniques rely on crystals or structured illumination, but recent work has shown that dark-field effects are observable in straightforward propagation-based imaging (PBI). Based on the single-material X-ray Fokker–Planck equation with an a priori dark-field energy dependence, we propose an algorithm to extract phase and dark-field effects from dual-energy PBI images. We successfully apply the dark-field retrieval algorithm to simulated and experimental dual-energy data, and show that by accounting for dark-field effects, projected thickness reconstruction is improved compared to the classic Paganin algorithm. With the emergence of spectral detectors, the method could enable single-exposure dark-field imaging of dynamic and living samples.

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Ahlers, J. N., Pavlov, K. M., Kitchen, M. J., & Morgan, K. S. (2024). X-ray dark-field via spectral propagation-based imaging. Optica, 11(8), 1182. https://doi.org/10.1364/optica.506742

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