title: [A ROC analysis for comparing contrast perception in grey scale reversal of digital images].
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.
authors.affiliation: Institut für Röntgendiagnostik, Universität Würzburg.
authors.forename: W
authors.initials: W
authors.lastname: Dölken
authors.forename: T
authors.initials: T
authors.lastname: Krahe
authors.forename: P
authors.initials: P
authors.lastname: Landwehr
authors.forename: A E
authors.initials: AE
authors.lastname: Horwitz
authors.forename: K
authors.initials: K
authors.lastname: Lackner
mesh_terms: D006801:Humans; D012372:ROC Curve; D011856:Radiographic Image Enhancement; D014796:Visual Perception / Q000502:physiology*