Radiology, Vol 205, 859-863, Copyright © 1997 by Radiological Society of North America

ARTICLES

Accuracy of bedside chest hard-copy screen-film versus hard- and soft- copy computed radiographs in a medical intensive care unit: receiver operating characteristic analysis

HL Kundel, W Gefter, J Aronchick, W Miller Jr, H Hatabu, CH Whitfill and Sr Miller W
Department of Radiology, Pendergrass Diagnostic Research Laboratory, University of Pennsylvania Medical School, Philadelphia 19104-6086, USA.

PURPOSE: To compare the clinical diagnostic accuracy of hard-copy readings of screen-film bedside chest radiographs and both hard- and soft-copy readings of bedside chest computed radiographs obtained in a medical intensive care unit. MATERIALS AND METHODS: Two samples of 95 cases were assembled from chest images obtained in 541 patients with either screen-film radiography or computed radiography. The cases were stratified according to the clinical problem for which the examination was ordered; the corresponding diagnosis was verified by a panel of two or three radiologists. Four radiologists blindly read the hard-copy images obtained with screen-film or computed radiography. Six months later, the radiologists read the computed radiographs by using an 8- bit, 1,684 x 2,048-pixel display. The data were analyzed by using multireader-multicase receiver operating characteristic (ROC) analysis of variance. RESULTS: No statistically significant differences in the area under the ROC curve were found between any of the methods. CONCLUSION: The results provide some justification for using bedside chest computed radiography and for reading soft-copy images from a high- quality display.

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