Abstract
The effects of charge carrier trapping (i.e., incomplete charge collection) on the detective quantum efficiency (DQE) of a photoconductive detector are studied by using a cascaded linear system model. The model includes signal and noise propagations in the following stages: (1) x-ray attenuation, (2) conversion gain, (3) charge collection, and (4) the addition of electronic noise. We examine and discuss the DQE of an a-Se fluoroscopic detector as a function of charge transport parameters and x-ray exposure. The theoretical model shows a very good agreement with experimental DQE versus exposure characteristics.
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