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Proceedings Paper

Spatial resolution requirements for soft-copy reporting in digital radiography
Author(s): Andrew G. Davies; Arnold R. Cowen; Richard C. Fowler; Robert F. Bury; Geoff J. S. Parkin; David J. Lintott; Delia Martinez; Asif Safudim
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Paper Abstract

The issue of the spatial resolution required in order to present diagnostic quality digital images, especially for softcopy reporting, has received much attention over recent years. The aim of this study was to compare the diagnostic performance reporting from hardcopy and optimized softcopy image presentations. One-hundred-fifteen radiographs of the hand acquired on a photostimulable phosphor computed radiography (CR) system were chosen as the image material. The study group was taken from patients who demonstrated subtle erosions of the bone in the digits. The control group consisted of radiologically normal bands. The images were presented in three modes, the CR system's hardcopy output, and softcopy presentations at full and half spatial resolutions. Four consultant radiologists participated as observers. Results were analyzed using the receiver operating characteristic (ROC) technique, and showed a statistically significant improvement in observer performance for both softcopy formats, when compared to the hardcopy presentation. However, no significant difference in observer performance was found between the two softcopy presentations. We therefore conclude that, with appropriate attention to the processing and presentation of digital image data, softcopy reporting can, for most examinations, provide superior diagnostic performance, even for images viewed at modest (1 k2) resolutions.

Paper Details

Date Published: 15 April 1996
PDF: 10 pages
Proc. SPIE 2707, Medical Imaging 1996: Image Display, (15 April 1996); doi: 10.1117/12.238461
Show Author Affiliations
Andrew G. Davies, Univ. of Leeds (United Kingdom)
Arnold R. Cowen, Univ. of Leeds (United Kingdom)
Richard C. Fowler, General Infirmary at Leeds (United Kingdom)
Robert F. Bury, General Infirmary at Leeds (United Kingdom)
Geoff J. S. Parkin, General Infirmary at Leeds (United Kingdom)
David J. Lintott, General Infirmary at Leeds (United Kingdom)
Delia Martinez, General Infirmary at Leeds (United Kingdom)
Asif Safudim, General Infirmary at Leeds (United Kingdom)

Published in SPIE Proceedings Vol. 2707:
Medical Imaging 1996: Image Display
Yongmin Kim, Editor(s)

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