X-Ray Dark-Field Signal Reduction Due to Hardening of the Visibility Spectrum

Fabio De Marco, Jana Andrejewski, Theresa Urban, Konstantin Willer, Lukas Gromann, Thomas Koehler, Hanns Ingo Maack, Julia Herzen, Franz Pfeiffer

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

X-ray dark-field imaging enables a spatially-resolved visualization of ultra-small-angle X-ray scattering. Using phantom measurements, we demonstrate that a material’s effective dark-field signal may be reduced by modification of the visibility spectrum by other dark-field-active objects in the beam. This is the dark-field equivalent of conventional beam-hardening, and is distinct from related, known effects, where the dark-field signal is modified by attenuation or phase shifts. We present a theoretical model for this group of effects and verify it by comparison to the measurements. These findings have significant implications for the interpretation of dark-field signal strength in polychromatic measurements.

Original languageEnglish
Pages (from-to)1422-1433
Number of pages12
JournalIEEE Transactions on Medical Imaging
Volume43
Issue number4
DOIs
StatePublished - 1 Apr 2024

Keywords

  • Quantification and estimation
  • X-ray imaging
  • computed tomography
  • tissue modeling

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