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Proceedings Paper

A robust approach to measuring the detective quantum efficiency of radiographic detectors in a clinical setting
Author(s): Michael C. McDonald; H. K. Kim; J. R. Henry; I. A. Cunningham
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Paper Abstract

The detective quantum efficiency (DQE) is widely accepted as a primary measure of x-ray detector performance in the scientific community. A standard method for measuring the DQE, based on IEC 62220-1, requires the system to have a linear response meaning that the detector output signals are proportional to the incident x-ray exposure. However, many systems have a non-linear response due to characteristics of the detector, or post processing of the detector signals, that cannot be disabled and may involve unknown algorithms considered proprietary by the manufacturer. For these reasons, the DQE has not been considered as a practical candidate for routine quality assurance testing in a clinical setting. In this article we described a method that can be used to measure the DQE of both linear and non-linear systems that employ only linear image processing algorithms. The method was validated on a Cesium Iodide based flat panel system that simultaneously stores a raw (linear) and processed (non-linear) image for each exposure. It was found that the resulting DQE was equivalent to a conventional standards-compliant DQE with measurement precision, and the gray-scale inversion and linear edge enhancement did not affect the DQE result. While not IEC 62220-1 compliant, it may be adequate for QA programs.

Paper Details

Date Published: 9 March 2012
PDF: 8 pages
Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831315 (9 March 2012); doi: 10.1117/12.912923
Show Author Affiliations
Michael C. McDonald, Robarts Research Institute (Canada)
The Univ. of Western Ontario (Canada)
H. K. Kim, Pusan National Univ. (Korea, Republic of)
J. R. Henry, London Health Sciences Ctr. (Canada)
I. A. Cunningham, Robarts Research Institute (Canada)
The Univ. of Western Ontario (Canada)
London Health Sciences Ctr. (Canada)

Published in SPIE Proceedings Vol. 8313:
Medical Imaging 2012: Physics of Medical Imaging
Norbert J. Pelc; Robert M. Nishikawa; Bruce R. Whiting, Editor(s)

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