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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 24, Iss. 12 — Dec. 1, 2007
  • pp: B1–B12

Human linear template with mammographic backgrounds estimated with a genetic algorithm

Cyril Castella, Craig K. Abbey, Miguel P. Eckstein, Francis R. Verdun, Karen Kinkel, and François O. Bochud  »View Author Affiliations

JOSA A, Vol. 24, Issue 12, pp. B1-B12 (2007)

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We estimated human observer linear templates underlying the detection of a realistic, spherical mass signal with mammographic backgrounds. Five trained naïve observers participated in two-alternative forced-choice (2-AFC) detection experiments with the signal superimposed on synthetic, clustered lumpy backgrounds (CLBs) in one condition and on nonstationary real mammographic backgrounds in another. Human observer linear templates were estimated using a genetic algorithm. A variety of common model observer templates were computed, and their shapes and associated performances were compared with those of the human observer. The estimated linear templates are not significantly different for stationary CLBs and real mammographic backgrounds. The estimated performance of the linear template compared with that of the human observers is within 5% in terms of percent correct (Pc) for the 2-AFC task. Channelized Hotelling models can fit human performance, but the templates differ considerably from the human linear template. Due to different local statistics, detection efficiency is significantly higher on nonstationary real backgrounds than on globally stationary synthetic CLBs. This finding emphasizes that nonstationary backgrounds need to be described by their local statistics.

© 2007 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(110.3000) Imaging systems : Image quality assessment
(170.3830) Medical optics and biotechnology : Mammography
(330.1880) Vision, color, and visual optics : Detection
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5510) Vision, color, and visual optics : Psychophysics

Original Manuscript: May 1, 2007
Manuscript Accepted: June 29, 2007
Published: September 21, 2007

Virtual Issues
Vol. 3, Iss. 1 Virtual Journal for Biomedical Optics

Cyril Castella, Craig K. Abbey, Miguel P. Eckstein, Francis R. Verdun, Karen Kinkel, and François O. Bochud, "Human linear template with mammographic backgrounds estimated with a genetic algorithm," J. Opt. Soc. Am. A 24, B1-B12 (2007)

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