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Proceedings Paper

Detection in power-law noise: spectrum exponents and CD diagram slopes
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Paper Abstract

Normal mammographic image backgrounds have approximately isotropic power spectra of the form, P(f) =K/fe, where f is radial frequency. The values ofthe exponent, 3, range from 1.5 to 3.5 with an average of about 2.8. The ideal observer model predicts that, for signals with certain properties, the log-log contrast-detail (CD) diagram slope, m, is given by: m = O.5(3-2). Previously, we reported results for detection of a model mass (designer nodule) in filtered noise with an exponent of 3. The model and human observer CD slopes were 0.5 and 0.45 respectively. Here, we report preliminary results for human and model observer 2AFC detection of a simple signal in filtered noise with exponents from 1.5 to 3.5. Our results are in good agreement with the prediction of the above equation. We will also describe results of 2AFC detection experiments done using "twin" noise backgrounds with identical noise realizations in the two backgrounds. We could not replicate the results ofJohnson et al. For '1/f3' noise, they found a CD slope of—O.59 while we found +0.37.

Paper Details

Date Published: 22 May 2003
PDF: 6 pages
Proc. SPIE 5034, Medical Imaging 2003: Image Perception, Observer Performance, and Technology Assessment, (22 May 2003); doi: 10.1117/12.479974
Show Author Affiliations
Arthur E. Burgess, Brigham and Women's Hospital/Harvard Medical School (United States)
Philip F. Judy, Brigham and Women's Hospital/Harvard Medical School (United States)


Published in SPIE Proceedings Vol. 5034:
Medical Imaging 2003: Image Perception, Observer Performance, and Technology Assessment
Dev P. Chakraborty; Elizabeth A. Krupinski, Editor(s)

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