Challenges of employing a high resolution x-ray detector in a coded-aperture x-ray phase-contrast imaging system

Abdollah Pil-Ali; Sahar Adnani; Christopher C. Scott; Karim S. Karim

doi:10.1117/12.2582351

15 February 2021 Challenges of employing a high resolution x-ray detector in a coded-aperture x-ray phase-contrast imaging system

Abdollah Pil-Ali, Sahar Adnani, Christopher C. Scott, Karim S. Karim

Author Affiliations +

Proceedings Volume 11595, Medical Imaging 2021: Physics of Medical Imaging; 115954O (2021) https://doi.org/10.1117/12.2582351
Event: SPIE Medical Imaging, 2021, Online Only

Conference Poster

Abstract

In this work, we have evaluated the performance of a coded-aperture (edge-illumination) x-ray phase contrast imaging (CA-XPCi) system employing a high resolution x-ray detector with pixel pitch and size equal to 7.8 µm. Two of the main challenges concerning a high resolution x-ray detector employed in a CA-XPCi system that are fabrication of high resolution x-ray absorption masks and environmental vibration are addressed in this paper. We have investigated both the effect of absorption mask thicknesses and mechanical vibration on the performance of a high resolution CA-XPCi system employing a simulation tool based on a wave-optics model. It is demonstrated how the thickness of absorption mask affects the behavior of the CA-XPCi system when more than 30% of the incident x-ray is transmitted through the absorption masks. The behavior of the CA-XPCi system will change to propagation-based (PB) XPCi one when the transmitted portion of x-rays through absorption masks exceeds 60% of the incident beam. It is also highlighted how mechanical (environmental) vibration has an almost minor effect on CA-XPCi systems with big pixel sizes, however, it has a considerable impact on a CA-XPCi system when a high resolution detector is employed. Albeit a high resolution CA-XPCi system has not been yet realized in reality due to technological bottlenecks related to high resolution mask fabrication, this study provides a comprehensive analysis on the challenges we will face to use a high resolution x-ray detector with the current technology, thus they can be considered in future designs.

Conference Presentation

Citation Download Citation

Abdollah Pil-Ali, Sahar Adnani, Christopher C. Scott, and Karim S. Karim "Challenges of employing a high resolution x-ray detector in a coded-aperture x-ray phase-contrast imaging system", Proc. SPIE 11595, Medical Imaging 2021: Physics of Medical Imaging, 115954O (15 February 2021); https://doi.org/10.1117/12.2582351

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