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Proceedings Paper

Objective measures of quality assurance in a computed radiography-based radiology department
Author(s): Charles E. Willis; Robert G. Leckie; Jon R. Carter; Morgan P. Williamson; Stephen D. Scotti; Gary S. Norton
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Paper Abstract

Parameters are needed to assess quality assurance in a radiology department where computed radiography (CR) is the principal means of image acquisition. Laser-printed computed radiographs were collected for all patients examined over a period of several days. A sample of 1200 was sorted by subject anatomy and the associated exam information was entered into an EXCEL spreadsheet. Sensitivity (S) numbers were sorted into histogram and analyzed using standard descriptive statistics. Each film was over-read by a board-certified radiologist to assess whether the image was diagnostic and to determine if there were pathologic findings. A significant proportion of images were acquired using inappropriate menu codes. The histogram of S numbers for a given menu code describes a log normal distribution. The S number depends on the technologist's ability to control the technique. A significant proportion of the images were deemed non diagnostic, and many correlated to excessive S numbers. Some were a result of mispositioning. The S number is a valid retrospective measure of radiographic quality assurance. Departments using CR should strive for control on menu codes selected and S numbers produced. Such data should be available from PACS databases.

Paper Details

Date Published: 8 May 1995
PDF: 12 pages
Proc. SPIE 2432, Medical Imaging 1995: Physics of Medical Imaging, (8 May 1995); doi: 10.1117/12.208381
Show Author Affiliations
Charles E. Willis, Univ. of Texas/Houston (United States)
Robert G. Leckie, Walter Reed Army Medical Ctr. (United States)
Jon R. Carter, Madigan Army Medical Ctr. (United States)
Morgan P. Williamson, U.S. Army Medical Research and Materiel Command (United States)
Stephen D. Scotti, U.S. Air Force Medical Logistics Office (United States)
Gary S. Norton, U.S. Air Force Medical Logistics Office (United States)

Published in SPIE Proceedings Vol. 2432:
Medical Imaging 1995: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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