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Journal of Medical Imaging

Computational assessment of visual search strategies in volumetric medical images
Author(s): Gezheng Wen; Avigael Aizenman; Trafton Drew; Jeremy M. Wolfe; Tamara Miner Haygood; Mia K. Markey
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Paper Abstract

When searching through volumetric images [e.g., computed tomography (CT)], radiologists appear to use two different search strategies: “drilling” (restrict eye movements to a small region of the image while quickly scrolling through slices), or “scanning” (search over large areas at a given depth before moving on to the next slice). To computationally identify the type of image information that is used in these two strategies, 23 naïve observers were instructed with either “drilling” or “scanning” when searching for target T’s in 20 volumes of faux lung CTs. We computed saliency maps using both classical two-dimensional (2-D) saliency, and a three-dimensional (3-D) dynamic saliency that captures the characteristics of scrolling through slices. Comparing observers’ gaze distributions with the saliency maps showed that search strategy alters the type of saliency that attracts fixations. Drillers’ fixations aligned better with dynamic saliency and scanners with 2-D saliency. The computed saliency was greater for detected targets than for missed targets. Similar results were observed in data from 19 radiologists who searched five stacks of clinical chest CTs for lung nodules. Dynamic saliency may be superior to the 2-D saliency for detecting targets embedded in volumetric images, and thus “drilling” may be more efficient than “scanning.”

Paper Details

Date Published: 6 January 2016
PDF: 12 pages
J. Med. Imag. 3(1) 015501 doi: 10.1117/1.JMI.3.1.015501
Published in: Journal of Medical Imaging Volume 3, Issue 1
Show Author Affiliations
Gezheng Wen, The Univ. of Texas at Austin (United States)
Univ. of Texas MD Anderson Cancer Ctr. (United States)
Avigael Aizenman, Brigham and Women's Hospital (United States)
Trafton Drew, The Univ. of Utah (United States)
Jeremy M. Wolfe, Brigham and Women's Hospital (United States)
Harvard Medical School (United States)
Tamara Miner Haygood, The Univ. of Texas M.D. Anderson Cancer Ctr. (United States)
Mia K. Markey, The Univ. of Texas at Austin (United States)
Univ. of Texas MD Anderson Cancer Ctr. (United States)

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