Polyp height and width measurement using topographic height map

Jianhua Yao; Suzanne Frentz; Jiang Li; Ronald Summers

doi:10.1117/12.769463

12 March 2008 Polyp height and width measurement using topographic height map

Jianhua Yao, Suzanne Frentz, Jiang Li, Ronald Summers

Proceedings Volume 6916, Medical Imaging 2008: Physiology, Function, and Structure from Medical Images; 69160B (2008) https://doi.org/10.1117/12.769463
Event: Medical Imaging, 2008, San Diego, California, United States

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.

Citation Download Citation

Jianhua Yao, Suzanne Frentz, Jiang Li, and Ronald Summers "Polyp height and width measurement using topographic height map", Proc. SPIE 6916, Medical Imaging 2008: Physiology, Function, and Structure from Medical Images, 69160B (12 March 2008); https://doi.org/10.1117/12.769463

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