Visual search in angiograms: does geometry play a role in saliency?

Jannick P. Rolland; Christopher S. Helvig

doi:10.1117/12.236863

27 March 1996 Visual search in angiograms: does geometry play a role in saliency?

Jannick P. Rolland, Christopher S. Helvig

Proceedings Volume 2712, Medical Imaging 1996: Image Perception; (1996) https://doi.org/10.1117/12.236863
Event: Medical Imaging 1996, 1996, Newport Beach, CA, United States

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.

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Jannick P. Rolland and Christopher S. Helvig "Visual search in angiograms: does geometry play a role in saliency?", Proc. SPIE 2712, Medical Imaging 1996: Image Perception, (27 March 1996); https://doi.org/10.1117/12.236863

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KEYWORDS

Angiography

Visualization

Blood vessels

Medical imaging

Image quality

Eye

Time metrology

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