Detection characterization of Cd1-xZnxTe detectors for x-ray linear arrays

George C. Giakos; Srinivasan Vedantham; Sankararaman Suryanarayanan; Samir Chowdhury; Ravi K. Guntupalli; J. Odogba; Amlan Dasgupta; Bindu Pillai; Robert J. Endorf

doi:10.1117/12.317056

24 July 1998 Detection characterization of Cd_1-xZn_xTe detectors for x-ray linear arrays

George C. Giakos, Srinivasan Vedantham, Sankararaman Suryanarayanan, Samir Chowdhury, Ravi K. Guntupalli, J. Odogba, Amlan Dasgupta, Bindu Pillai, Robert J. Endorf

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Proceedings Volume 3336, Medical Imaging 1998: Physics of Medical Imaging; (1998) https://doi.org/10.1117/12.317056
Event: Medical Imaging '98, 1998, San Diego, CA, United States

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_1-xZn_xTe detector, for fast digital radiographic and CT applications. The experimental results indicate that Cd_1-xZn_xTe 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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George C. Giakos, Srinivasan Vedantham, Sankararaman Suryanarayanan, Samir Chowdhury, Ravi K. Guntupalli, J. Odogba, Amlan Dasgupta, Bindu Pillai, and Robert J. Endorf "Detection characterization of Cd_1-xZn_xTe detectors for x-ray linear arrays", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); https://doi.org/10.1117/12.317056

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KEYWORDS

Sensors

Modulation transfer functions

Signal to noise ratio

X-ray detectors

X-rays

Electric field sensors

Spatial resolution

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