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Proceedings Paper

Analysis of discrepancies observed between digital and analog images during a clinical trial of IRIS
Author(s): Morris Goldberg; Marjorie Coristine; Shawn Currie; Garry Belanger; J. Ahuja; Richard F. Dillon; John G. Robertson
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Paper Abstract

A clinical trial of an Integrated Radiological Information System (IRIS) was conducted at the Ottawa Civic Hospital with the Department of Emergency Medicine and the Department of Radiological Sciences between April 4, and May 12, 1989. During the trial, 319 active Emergency Department cases (905 films) were processed using IRIS. Radiologists examined the digital images on the image screen to formulate a diagnosis, then before dictating a report, they examined the analog films. In 30 cases there was a discrepancy between the information obtained while viewing the digital images on IRIS and the information obtained from the analog films. These anomalous cases were used in an independent study of the discrepancies. In the study, each case was reviewed in both digital and analog form by three physicians who provided a comparative rating of diagnostic quality. Any perceived differences between the digital and analog media were noted. Particular attention was paid to rating the relevance of the IRIS enhancement capabilities. Although ratings for digital images were high, the comparative ratings for the film are in general better. An analysis of the individual cases shows that: (i) most of the discrepancies probably resulted from physician inexperience in reading radiographs in digital form, (ii) the IRIS enhancement facilities significantly increase the ratings of satisfaction or perceived quality of digital images and (iii) an appropriate choice of enhancement may make visible the required diagnostic features for cases where some reviewers did not find the image/digital discrepant.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1234, Medical Imaging IV: PACS Systems Design and Evaluation, (1 August 1990); doi: 10.1117/12.18972
Show Author Affiliations
Morris Goldberg, Univ. of Ottawa (Canada)
Marjorie Coristine, Carleton Univ. (Canada)
Shawn Currie, Carleton Univ. (Canada)
Garry Belanger, Ottawa Civic Hospital (Canada)
J. Ahuja, Ottawa Civic Hospital (Canada)
Richard F. Dillon, Carleton Univ. (Canada)
John G. Robertson, Univ. of Ottawa (Canada)


Published in SPIE Proceedings Vol. 1234:
Medical Imaging IV: PACS Systems Design and Evaluation
Samuel J. Dwyer; R. Gilbert Jost, Editor(s)

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