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Colon polyp detection using smoothed shape operators: preliminary results.

P Sundaram1, A Zomorodian, C Beaulieu

  • 1Department of Radiology, Stanford University, Stanford, CA 94305, United States. padma@stanford.edu

Medical Image Analysis
|October 4, 2007
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Summary

The smoothed shape operators (SSO) method improves polyp detection in CT colonography by using discrete geometry processing. This novel approach significantly outperforms existing methods in identifying polyps of all sizes.

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Area of Science:

  • Medical Imaging
  • Computational Geometry
  • Computer-Aided Diagnosis

Background:

  • Computer-aided detection (CAD) in CT colonography aids polyp identification.
  • Existing CAD methods struggle with noise and discrete data in CT images.
  • Curvature estimation in voxelized data amplifies noise, limiting accuracy.

Purpose of the Study:

  • To introduce the smoothed shape operators (SSO) method for improved polyp detection.
  • To address limitations of existing CAD algorithms in handling discrete and noisy CT data.
  • To evaluate the performance of SSO against the surface normal overlap (SNO) method.

Main Methods:

  • Developed a geometry processing approach using triangle mesh representation of the colon surface.
  • Estimated curvature using shape operators and smoothed them iteratively on the discrete surface.
  • Utilized techniques designed for discrete geometry, performing computations directly on the surface mesh.

Main Results:

  • SSO achieved an overall polyp detection sensitivity of 80.3% with 23.9 false positives/case.
  • SSO demonstrated superior performance across all polyp size ranges compared to SNO.
  • For large polyps (≥10mm), SSO achieved 100% sensitivity versus 75% for SNO.

Conclusions:

  • The SSO method offers a robust and accurate approach for polyp detection in CT colonography.
  • SSO's discrete geometry processing effectively mitigates noise issues present in CT data.
  • This method shows significant potential for enhancing the diagnostic performance of CAD systems.