Abstract
In this paper, the detected signal-to-noise was measured and related to the tube current (mA) setting. The line spread function amplitude (LSF) dependence on drift distance of a 3 mm thick detector, for 100 kVp, 100 mA, with an applied electric field of 50 V/mm, and 100 V/mm, were measured. In addition, the dependence of the modulation transfer function [MTF(f)] of the x-ray detector system on the applied bias voltage has been experimentally determined. The experimental setup, although is not offered for large field-of-view imaging applications, offers capabilities for feasibility studies, research and evaluation of the temporal response and noise characteristics of a Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te detector, for fast digital radiographic and CT applications. The experimental results indicate that Cd<SUB>1-x</SUB>Zn<SUB>x</SUB>Te detectors exhibit both a high signal-to-noise ratio and linear response, as well as a good spatial resolution within the diagnostic energy range. Tor system improves both with increasing applied bias voltage and decreasing detector thickness. A study is in process aimed at improving the spatial resolution of the x-ray system by suitable optimization of the system geometry as well as the system temporal response.
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