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Proceedings Paper

2-AFC observer study of digital stereomammography
Author(s): Predrag R. Bakic; Michael Albert; Andrew D. A. Maidment
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Paper Abstract

A two-alternative forced choice (2-AFC) observer study has been performed to estimate the dose needed for detection of small cancers by digital stereomammography compared to projection mammography. Monoscopic and stereoscopic images simulating 4 different values of signal-to-noise ratio (SNR) were interleaved and repeated for 3 different object diameters. Five hundred images per condition were read by 4 observers and the fraction of correct answers and the corresponding d' as a function of condition were calculated. Preliminary results indicate that stereoscopy could be performed at 1.5+/-0.2 times the dose of monoscopic viewing. In our previous contrast-detail (C-d) study, we observed a factor of 1.1+/-0.1. The two experiments differ in target properties and decision tasks. In the C-d experiment, the viewer was asked to determine whether suprathreshold objects with an SNR of 5-6 were visualized in terms of a well defined edge and shape. In the 2-AFC experiment, the viewer was asked to detect an object at the limits of visibility (SNR range of 1 to 3). Experiments to elucidate the differences in observer performance are planned.

Paper Details

Date Published: 22 May 2003
PDF: 9 pages
Proc. SPIE 5034, Medical Imaging 2003: Image Perception, Observer Performance, and Technology Assessment, (22 May 2003); doi: 10.1117/12.480354
Show Author Affiliations
Predrag R. Bakic, Univ. of Pennsylvania (United States)
Michael Albert, Univ. of Pennsylvania (United States)
Andrew D. A. Maidment, Univ. of Pennsylvania (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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