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Analysis of variations in contrast‐detail experiments
Author(s) -
Cohen Gerald,
McDaniel David L.,
Wagner Louis K.
Publication year - 1984
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 - 10.1118/1.595539
Subject(s) - contrast (vision) , medical imaging , computer science , artificial intelligence
Three sources of variability in a contrast‐detail (CD) experiment have been quantitated: within‐observer variance, between‐observer variance, and sample variance. It is concluded that (1) it is more efficient to increase the numbers of replicated images and observers than to increase the number of readings; (2) sampling and between‐observer variations are approximately equal; (3) one can expect approximately 10% standard errors in the measured value of threshold detail or threshold contrast in a CD experiment which employs four observers, four replicate image samples, and one reading per observer.