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Proceedings Paper

Visual search in angiograms: does geometry play a role in saliency?
Author(s): Jannick P. Rolland; Christopher S. Helvig
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Paper Abstract

Quantifying and modeling how the human eye searches medical images is important. Equally detectable lesions may not be equally salient in a visual search. This research investigates the effect of geometry on the saliency of stenoses in angiograms. A previous experiment suggested that stenoses located in areas of high curvature along vessels would be less salient. In this paper, we measure the saliency of stenoses in two steps: first, we measure stenoses amplitude detection thresholds for stenoses at three values of curvature along vessels; second, after adjusting the degree of stenosis at these curvatures to multiples of the measured thresholds to achieve equal detectability, we measure the saliency of the stenoses in a visual search experiment. Median reaction time is used as a measure of saliency. We found that thresholds increase as curvature increases. This finding explains the decrease in saliency found in a previous investigation. Results also show that median reaction time is constant across different curvatures for 70% and higher degrees of stenosis, indicating that saliency is independent of geometry for clinically significant angiographic lesions.

Paper Details

Date Published: 27 March 1996
PDF: 11 pages
Proc. SPIE 2712, Medical Imaging 1996: Image Perception, (27 March 1996); doi: 10.1117/12.236863
Show Author Affiliations
Jannick P. Rolland, Univ. of North Carolina/Chapel Hill (United States)
Christopher S. Helvig, Univ. of North Carolina/Chapel Hill (United States)

Published in SPIE Proceedings Vol. 2712:
Medical Imaging 1996: Image Perception
Harold L. Kundel, Editor(s)

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