Modeling of pulse signals in photon-counting detectors

Chang Hwy Lim; Okla Joe; Ian Cunningham; Ho Kyung Kim

doi:10.1117/12.844161

22 March 2010 Modeling of pulse signals in photon-counting detectors

Chang Hwy Lim, Okla Joe, Ian Cunningham, Ho Kyung Kim

Proceedings Volume 7622, Medical Imaging 2010: Physics of Medical Imaging; 76223U (2010) https://doi.org/10.1117/12.844161
Event: SPIE Medical Imaging, 2010, San Diego, California, United States

Abstract

We are developing a theoretical model to describe signal pulses from a detector-amplifier system operated in photoncounting mode. In the model, we include incomplete signal generation due to the charge trapping within a semiconductor detector as well as to the ballistic deficit caused by insufficient charge integration time. This model can be utilized for the characterization of detector material properties such as the mobility and the lifetime, as well as the optimization of operation conditions such as the applied bias voltages and the charge integration time. The model was experimentally verified with the measurement of charge collection efficiency of a planar cadmium zinc telluride detector with respect to the applied bias voltage and the charge integration time. We expect that the developed model will be helpful for the design of photon-counting detectors.

Citation Download Citation

Chang Hwy Lim, Okla Joe, Ian Cunningham, and Ho Kyung Kim "Modeling of pulse signals in photon-counting detectors", Proc. SPIE 7622, Medical Imaging 2010: Physics of Medical Imaging, 76223U (22 March 2010); https://doi.org/10.1117/12.844161

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