Linked Life Data

16825743

Source:http://linkedlifedata.com/resource/pubmed/id/16825743

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
14
pubmed:dateCreated
2006-7-7
pubmed:abstractText
In imaging tasks where the observer is uncertain whether lesions are present, and where they could be present, the image is searched for lesions. In the free-response paradigm, which closely reflects this task, the observer provides data in the form of a variable number of mark-rating pairs per image. In a companion paper a statistical model of visual search has been proposed that has parameters characterizing the perceived lesion signal-to-noise ratio, the ability of the observer to avoid marking non-lesion locations, and the ability of the observer to find lesions. The aim of this work is to relate the search model parameters to receiver operating characteristic (ROC) curves that would result if the observer reported the rating of the most suspicious finding on an image as the overall rating. Also presented are the probability density functions (pdfs) of the underlying latent decision variables corresponding to the highest rating for normal and abnormal images. The search-model-predicted ROC curves are 'proper' in the sense of never crossing the chance diagonal and the slope is monotonically changing. They also have the interesting property of not allowing the observer to move the operating point continuously from the origin to (1, 1). For certain choices of parameters the operating points are predicted to be clustered near the initial steep region of the curve, as has been observed by other investigators. The pdfs are non-Gaussians, markedly so for the abnormal images and for certain choices of parameter values, and provide an explanation for the well-known observation that experimental ROC data generally imply a wider pdf for abnormal images than for normal images. Some features of search-model-predicted ROC curves and pdfs resemble those predicted by the contaminated binormal model, but there are significant differences. The search model appears to provide physical explanations for several aspects of experimental ROC curves.
pubmed:grant
pubmed:commentsCorrections
http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-10845401, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-10845402, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-112681, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-11548929, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-12512721, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-15377098, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-2312249, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-2753640, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-3095258, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-3398748, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-3423330, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-6849084, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-8946368, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-9061087, http://linkedlifedata.com/resource/pubmed/commentcorrection/16825743-9612889
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0031-9155
pubmed:author
pubmed:issnType
Print
pubmed:day
21
pubmed:volume
51
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3463-82
pubmed:dateRevised
2010-12-3
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
ROC curves predicted by a model of visual search.
pubmed:affiliation
Department of Radiology, University of Pittsburgh, 3520 5th Avenue, Suite 300, Pittsburgh, PA 15261, USA. dpc10@pitt.edu
pubmed:publicationType
Journal Article, Research Support, N.I.H., Extramural