| Autor: |
De Marco F, Andrejewski J, Urban T, Willer K, Gromann L, Koehler T, Maack HI, Herzen J, Pfeiffer F |
| Jazyk: |
angličtina |
| Zdroj: |
IEEE transactions on medical imaging [IEEE Trans Med Imaging] 2024 Apr; Vol. 43 (4), pp. 1422-1433. Date of Electronic Publication: 2024 Apr 03. |
| DOI: |
10.1109/TMI.2023.3337994 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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