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A performance analysis of a direct-conversion digital X-ray imager Salhotra, Amith Kumar
Abstract
In this thesis, the performance of direct-conversion digital X-ray imagers is evaluated using an elementary model that draws upon the material properties and the dimensions of the X-ray photoconductor employed within such imagers. Five possible X-ray photoconductors are considered in this analysis, namely amorphous selenium, cadmium zinc telluride, mercury iodide, lead iodide, and thallium bromide. The collected charge per unit area is the performance metric considered in this analysis. The collected charge per unit area related to the motion of the electrons and holes individually, and due the motion of both types of charge carriers, is evaluated. The fractional contributions to the collected charge per unit area is also evaluated. The application of both positive and negative biases to the radiation receiving terminals is considered. It is found that the collected charge per unit area, for the case of both positive and negative biases, is higher for the case of cadmium zinc telluride when compared with the other X-ray photoconductors considered in this analysis. This suggests that cadmium zinc telluride may be a better material to employ as the X-ray photoconductor within direct-conversion digital X-ray imagers.
Item Metadata
Title |
A performance analysis of a direct-conversion digital X-ray imager
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2014
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Description |
In this thesis, the performance of direct-conversion digital X-ray imagers
is evaluated using an elementary model that draws upon the material properties and the dimensions of the X-ray photoconductor employed within such
imagers. Five possible X-ray photoconductors are considered in this analysis, namely amorphous selenium, cadmium zinc telluride, mercury iodide,
lead iodide, and thallium bromide. The collected charge per unit area is the
performance metric considered in this analysis. The collected charge per
unit area related to the motion of the electrons and holes individually, and
due the motion of both types of charge carriers, is evaluated. The fractional
contributions to the collected charge per unit area is also evaluated. The
application of both positive and negative biases to the radiation receiving
terminals is considered. It is found that the collected charge per unit area,
for the case of both positive and negative biases, is higher for the case of
cadmium zinc telluride when compared with the other X-ray photoconductors considered in this analysis. This suggests that cadmium zinc telluride
may be a better material to employ as the X-ray photoconductor within
direct-conversion digital X-ray imagers.
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Genre | |
Type | |
Language |
eng
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Date Available |
2014-09-30
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivs 2.5 Canada
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DOI |
10.14288/1.0074381
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2014-11
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Campus | |
Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivs 2.5 Canada