9 March 2018 Multi-layer dual-energy detectors with fiber optic faceplate
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Abstract
Sandwich-like multilayer detectors can measure dual-energy images at a single x-ray shot and the resulting images are free from the motion artifacts. In case of phosphor-coupled photodiode detector-based multilayer detectors, the direct x-ray interaction within the front photodiode layer can be a significant noise source. In this study, we propose to use a fiber-optic faceplate (FOP) between the front phosphor and photodiode layers, instead of the intermediate metal filter between the front and rear detector layers. This detector design is based on the fact that the FOP can reduce the probability of direct interaction of x-ray photons with the front photodiode as well as prevent x-ray photons with lower energies from reaching the rear detector layer. We develop a cascaded-systems model to describe the signal and noise characteristics in multilayer detector designs with the FOP. With the developed model, we investigate the imaging performance of the proposed detector designs for various FOP thicknesses in comparisons with the experimental measurements. The cascaded-systems analysis and demonstration dual-energy images of a postmortem mouse show that the proposed design is feasible for dual-energy imaging.
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Dong Woon Kim, Dong Woon Kim, Junwoo Kim, Junwoo Kim, Jiwoong Park, Jiwoong Park, Sung Kyn Heo, Sung Kyn Heo, Ho Kyung Kim, Ho Kyung Kim, } "Multi-layer dual-energy detectors with fiber optic faceplate", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 105735B (9 March 2018); doi: 10.1117/12.2293057; https://doi.org/10.1117/12.2293057
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