Contribution of scatter and beam hardening to phase contrast imaging

Cale Lewis; Ivan Vazquez; Stefano Vespucci; Mini Das

doi:10.1117/12.2513512

13 March 2019 Contribution of scatter and beam hardening to phase contrast imaging

Cale Lewis, Ivan Vazquez, Stefano Vespucci, Mini Das

Proceedings Volume 10948, Medical Imaging 2019: Physics of Medical Imaging; 109485G (2019) https://doi.org/10.1117/12.2513512
Event: SPIE Medical Imaging, 2019, San Diego, California, United States

Abstract

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.

Citation Download Citation

Cale Lewis, Ivan Vazquez, Stefano Vespucci, and Mini Das "Contribution of scatter and beam hardening to phase contrast imaging", Proc. SPIE 10948, Medical Imaging 2019: Physics of Medical Imaging, 109485G (13 March 2019); https://doi.org/10.1117/12.2513512

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