PMID: 8946368Oct 1, 1996Paper

Unified measurement of observer performance in detecting and localizing target objects on images

Medical Physics
R G Swensson

Abstract

In this paper methods used to measure observer performance are reviewed, and a simple general model for finding and reporting target objects in gray-scale image backgrounds is presented. That model provides the basis for a combined measurement of detection and localization performance in various image-interpretation tasks, whether by human observers or by realized computer algorithms. The model assumes that (1) an observer's detection response and first choice of target location both depend on the "maximally suspicious" finding on an image, (2) a correct (first-choice) localization of the actual target occurs if and only if its location is selected as the most suspicious, and (3) a target's presence does not alter the degree of suspicion engendered by any other (normal) image findings. Formalization of these assumptions relates the ROC curve, which measures the ability to discriminate between images containing targets and images without targets, to the "Localization Response" (LROC) curve, which measures the conjoint ability to detect and correctly localize the actual targets in those images. A maximum-likelihood statistical procedure, developed for a two-parameter "binormal" version of this model, concurrently fits both the RO...Continue Reading

Citations

Mar 26, 2010·European Journal of Nuclear Medicine and Molecular Imaging·Habib Zaidi, Issam El Naqa
Feb 27, 2010·Advances in Health Sciences Education : Theory and Practice·Kathy BoutisMartin Pusic
Jan 1, 2008·Radiological Physics and Technology·Charles E Metz
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