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 language | English |
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Pages (from-to) | 1422-1433 |
Number of pages | 12 |
Journal | IEEE Transactions on Medical Imaging |
Volume | 43 |
Issue number | 4 |
DOIs | |
State | Published - 1 Apr 2024 |
Keywords
- Quantification and estimation
- X-ray imaging
- computed tomography
- tissue modeling