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  • Title: [A ROC analysis for comparing contrast perception in grey scale reversal of digital images].
    Author: Dölken W, Krahe T, Landwehr P, Horwitz AE, Lackner K.
    Journal: Aktuelle Radiol; 1991 Jan; 1(1):23-7. PubMed ID: 2018803.
    Abstract:
    Based on ROC (receiver operating characteristic) analysis, contrast perception by eight physicians engaged in x-ray diagnostics for different lengths of time was examined in respect of inversion of grey scale values of digital x-ray film images. The ROC analysis showed a significantly superior contrast perception for imaging by the negative mode (bones white) than by the positive mode (bones black). With r* = + 0.61 a positive correlation was obtained between the period of the physicians' activity in x-ray diagnostics and the difference between the areas below the ROC curves for both imaging modes. Hence, the negative mode is to be preferred for diagnostic work based on digital x-ray film images.
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