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    The effect of abnormality-prevalence expectation on expert observer performance and visual search.

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    Authors
    Reed, Warren M
    Ryan, John T
    McEntee, Mark F
    Evanoff, Michael G
    Brennan, Patrick C
    Affiliation
    Department of Medical Imaging and Radiation Sciences, Faculty of Health Sciences, University of Sydney, Cumberland Campus, East Street, PO Box 170, Lidcombe, NSW 1825, Australia. warren.reed@sydney.edu.au
    Issue Date
    2011-03
    
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    Citation
    The effect of abnormality-prevalence expectation on expert observer performance and visual search. 2011, 258 (3):938-43 Radiology
    Journal
    Radiology
    URI
    http://hdl.handle.net/10147/129474
    DOI
    10.1148/radiol.10101090
    PubMed ID
    21248231
    Abstract
    To measure the effect of abnormality-prevalence expectation on experienced radiologists' performance during pulmonary nodular lesion detection on a chest radiograph.
    A multiobserver receiver operating characteristic (ROC) and eye-position analysis study was performed to assess the effect of prevalence expectation on observer performance. Twenty-two experienced radiologists were divided into three groups and each was asked to interpret 30 (15 abnormal) identical posteroanterior chest images twice and decide if pulmonary lesions were present. Before each viewing, the radiologists were told that the images contained a specific number of abnormal images: group 1: 9 and 15; group 2: 15 and 22; and group 3: 15 and not told.
    ROC analysis demonstrated that no significant effect could be measured as a function of prevalence expectation (P > .05). However, eye-position analysis showed significant increases in eye movements at higher prevalence expectation rates in terms of the number of fixations per image (group 1: P = .0001; group 2: P = .0001; group 3: P = .001) and the total scrutiny time of each image (group 1: P = .0001; group 2: P = .0283; group 3: P = .028).
    Overall, findings of this study showed no evidence that the accuracy of expert radiologists is altered due to changing prevalence expectation rates. However, the time spent interpreting each image and the number of fixations increased at higher prevalence rates. Maintenance of diagnostic efficacy has been shown even when circumstances challenge normal observer behavior.
    Item Type
    Article
    Language
    en
    ISSN
    1527-1315
    ae974a485f413a2113503eed53cd6c53
    10.1148/radiol.10101090
    Scopus Count
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