| Autor: |
Cale Lewis, S. Vespucci, Ivan Vazquez, Mini Das |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Medical Imaging 2019: Physics of Medical Imaging. |
| Popis: |
X-ray phase contrast imaging is being investigated with the goal of improving the contrast of soft tissue. Enhanced edges at material boundaries are characteristic of phase contrast images. These allow better retrieval of phase maps and attenuation maps when material properties are very close to each other. Previous observations have shown that the edge contrast of a target material reduces with increasing thickness of the surrounding bulk material. In order to accurately retrieve material properties, it is important to understand the contributions from various factors that may lead to this phase degradation. We investigate this edge degradation dependence due to beam hardening and object scatter that results from the surrounding bulk material. Our results suggest that the large propagation distances used in PB-PCI are effective at reducing the scatter influence. Rather, our results indicate that the phase contrast degradation due to beam hardening is the most critical. The ability to account for these variations may be necessary for more accurate phase retrievals using polychromatic sources and large objects. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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