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  • Title: Digital and conventional chest imaging: a modified ROC study of observer performance using simulated nodules.
    Author: Chakraborty DP, Breatnach ES, Yester MV, Soto B, Barnes GT, Fraser RG.
    Journal: Radiology; 1986 Jan; 158(1):35-9. PubMed ID: 3940394.
    Abstract:
    A modified receiver operating characteristic (ROC) study was performed in which five readers were asked to locate multiple nodules on images of an anthropomorphic phantom obtained with a prototype digital radiographic chest unit and with a conventional chest unit. Results indicate that when nodules were projected over the lungs, a significantly greater number (significant at the 5% level) were identified on conventional radiographs, whereas for nodules projected over the mediastinum, the digital images were notably superior (difference significant at the 2% level). An error analysis of the multiple nodule problem and pseudo-ROC curves are presented. The modified ROC study does not suffer from the positional ambiguity inherent in most ROC studies and is efficient in acquiring data.
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