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Proceedings Paper

Polyp height and width measurement using topographic height map
Author(s): Jianhua Yao; Suzanne Frentz; Jiang Li; Ronald Summers
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Paper Abstract

The height and width of colonic polyps are important characteristics to evaluate the status and malignancy of polyps. We borrow the idea from geographic information systems to employ topographic height maps to compute the polyp height and width. The height map is generated using a ray-casting algorithm through an orthogonal projection. A concentric index is devised to gauge the quality of the height map and is maximized in a multi-scale spiral spherical search for the optimal projection. We then locate the polyp tip and neck using directional height profiles, and derive height and width measurement based on geometrical analysis. We manually measured the height and width of 58 polyps and performed paired t-tests between manual measurement and height map measurement. The test shows that Pearson correlation is 0.742 and P(T<=t) is 0.01 for height measurement; and Pearson correlation is 0.663 and P(T<=t) is 0.002 for width measurement.

Paper Details

Date Published: 12 March 2008
PDF: 10 pages
Proc. SPIE 6916, Medical Imaging 2008: Physiology, Function, and Structure from Medical Images, 69160B (12 March 2008); doi: 10.1117/12.769463
Show Author Affiliations
Jianhua Yao, National Institutes of Health (United States)
Suzanne Frentz, National Institutes of Health (United States)
Jiang Li, National Institutes of Health (United States)
Old Dominion Univ. (United States)
Ronald Summers, National Institutes of Health (United States)


Published in SPIE Proceedings Vol. 6916:
Medical Imaging 2008: Physiology, Function, and Structure from Medical Images
Xiaoping P. Hu; Anne V. Clough, Editor(s)

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