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Multipoint rank-order study methodology: observer issues.

J D Towers·J M Holbert·C A Britton·P Costello·R Sciulli·D Gur
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Abstract

RATIONALE AND OBJECTIVES: We performed a multipoint rank-order experiment to evaluate variability in observers' sensitivity to small differences in image presentation and to assess observers' performance as a function of the type and number of tasks included. METHODS: Five experienced observers were presented with four sets of chest images that had been compressed at five different levels. Each set contained six images ranging from noncompressed to approximately 60:1-compressed images. Observers were asked to review all images of each case side by side and rank-order the "quality" of each to enable determination of the presence or absence of interstitial disease and/or pneumothoraces. RESULTS: Observers varied significantly in their ability to detect very small differences among the images (P < 0.001). Those who performed well did so regardless of whether they ranked a specific abnormality in a multidisease or a single-disease setting. CONCLUSIONS: Selected observers can reliably detect very small differences among similar images. These readers could be used to confirm or rule out the need for objective observer-performance-type studies.

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HumansImage Processing, Computer-AssistedObserver VariationRadiography, ThoracicJournal ArticleResearch Support, U.S. Gov't, P.H.S.

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J D Towers, J M Holbert, C A Britton, P Costello, R Sciulli, D Gur. 2000. Multipoint rank-order study methodology: observer issues.. https://doi.org/10.1097/00004424-200002000-00006

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