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Comparison of ROC and AFC methods in a visual detection task
Author(s) -
Herrmann Clemens,
Buhr Egbert,
Hoeschen Dietmar,
Fan SuYue
Publication year - 1993
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596986
Subject(s) - medical imaging , computer science , artificial intelligence , task (project management) , medical physics , medicine , engineering , systems engineering
The visual observer performance for detecting low‐contrast patterns by employing both the receiver operating characteristic (ROC) and the 9‐alternative forced choice (9‐AFC) method is investigated. For each observer and each experimental technique, the results were reproducible with respect to a repeated observation. When the results of different observers for each method are compared, a strong variation of values is found. From the ROC data obtained, the expected percentages of correct detection in a 9‐AFC experiment is calculated and compared with the corresponding values of the actual 9‐AFC experiment. For some observers, the latter values were significantly higher than the computed ones, whereas for others the results showed good agreement with predictions from theory.