18 March 2015 Signal and noise analysis of flat-panel sandwich detectors for single-shot dual-energy x-ray imaging
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We have developed a novel sandwich-style single-shot (single-kV) detector by stacking two indirect-conversion flat-panel detectors for preclinical mouse imaging. In the sandwich detector structure, extra noise due to the direct x-ray absorption in photodiode arrays is inevitable. We develop a simple cascaded linear-systems model to describe signal and noise propagation in the flat-panel sandwich detector considering direct x-ray interactions. The noise-power spectrum (NPS) and detective quantum efficiency (DQE) obtained from the front and rear detectors are analyzed by using the cascaded-systems model. The NPS induced by the absorption of direct x-ray photons that are unattenuated within the photodiode layers is white in the spatial-frequency domain like the additive readout noise characteristic; hence that is harmful to the DQE at higher spatial frequencies at which the number of secondary quanta lessens. The model developed in this study will be useful for determining the optimal imaging techniques with sandwich detectors and their optimal design.
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Dong Woon Kim, Dong Woon Kim, Ho Kyung Kim, Ho Kyung Kim, Hanbean Youn, Hanbean Youn, Seungman Yun, Seungman Yun, Jong Chul Han, Jong Chul Han, Junwoo Kim, Junwoo Kim, Soohwa Kam, Soohwa Kam, Jesse Tanguay, Jesse Tanguay, Ian A Cunningham, Ian A Cunningham, "Signal and noise analysis of flat-panel sandwich detectors for single-shot dual-energy x-ray imaging", Proc. SPIE 9412, Medical Imaging 2015: Physics of Medical Imaging, 94124A (18 March 2015); doi: 10.1117/12.2081863; https://doi.org/10.1117/12.2081863

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