The effects of the spatio-energetic system response of cadmium telluride x-ray detectors on basis-material decomposition for iodine imaging tasks

Robert Lalonde; Jesse Tanguay

doi:10.1117/12.2548605

16 March 2020 The effects of the spatio-energetic system response of cadmium telluride x-ray detectors on basis-material decomposition for iodine imaging tasks

Robert Lalonde, Jesse Tanguay

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Proceedings Volume 11312, Medical Imaging 2020: Physics of Medical Imaging; 113124T (2020) https://doi.org/10.1117/12.2548605
Event: SPIE Medical Imaging, 2020, Houston, Texas, United States

Abstract

Spectroscopic x-ray detectors are under development in academic and industry laboratories, and have been receiving attention for their ability to perform single-shot, multi-material decomposition. However, a number of physical processes, including charge sharing and characteristic emission, cause spectral distortion which results in image degradation. In this study, the effects of the system response of cadmium telluride x-ray detectors on basis-material decomposition were investigated. A spatio-energetic model of the system response of spectroscopic x-ray detectors was developed and incorporated into material decomposition of simulated flat-field images. The spatio-energetic decomposition was compared against two other decomposition methods: one which incorporated the energy response and one which assumed an ideal system response. The results were also compared against the decomposition of images simulated assuming ideal conditions (i.e. no charge sharing or characteristic emission). All decomposition methods investigated here were shown to preserve linearity of the iodine signal with respect to the background. However, inclusion of the non-ideal system response resulted in a 3-fold reduction in SNR. Investigating the effects of the spatio-energetic system response on the spatial resolution of basis-material images will be a focus of future work.

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Robert Lalonde and Jesse Tanguay "The effects of the spatio-energetic system response of cadmium telluride x-ray detectors on basis-material decomposition for iodine imaging tasks", Proc. SPIE 11312, Medical Imaging 2020: Physics of Medical Imaging, 113124T (16 March 2020); https://doi.org/10.1117/12.2548605

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KEYWORDS

Iodine

Photons

Monte Carlo methods

Sensors

X-ray detectors

Imaging systems

Signal to noise ratio

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