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Proceedings Paper

Signal and noise analysis of flat-panel sandwich detectors for single-shot dual-energy x-ray imaging
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Paper Abstract

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.

Paper Details

Date Published: 18 March 2015
PDF: 13 pages
Proc. SPIE 9412, Medical Imaging 2015: Physics of Medical Imaging, 94124A (18 March 2015); doi: 10.1117/12.2081863
Show Author Affiliations
Dong Woon Kim, Pusan National Univ. (Korea, Republic of)
Ho Kyung Kim, Pusan National Univ. (Korea, Republic of)
Hanbean Youn, Pusan National Univ. (Korea, Republic of)
Seungman Yun, Pusan National Univ. (Korea, Republic of)
Jong Chul Han, Pusan National Univ. (Korea, Republic of)
Junwoo Kim, Pusan National Univ. (Korea, Republic of)
Soohwa Kam, Pusan National Univ. (Korea, Republic of)
Jesse Tanguay, Univ. of British Columbia (Canada)
Ian A Cunningham, Robarts Research Institute (Canada)


Published in SPIE Proceedings Vol. 9412:
Medical Imaging 2015: Physics of Medical Imaging
Christoph Hoeschen; Despina Kontos, Editor(s)

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