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Virtual colonoscopy detects polyps by navigating along a colon centerline. Complete colon segmentation based on computed tomography (CT) data is a prerequisite to the computation of complete colon centerline. There are two main problems impeding complete segmentation: overdistention/underdistention of colon and the use of oral contrast agents. Overdistention produces loops in the segmented colon,...
In this paper we present a colon straightening method based on a gravity field model. The colon is considered as an isotropic elastic solid geometry. Nonlinear finite element method is adopted to simulate the colon deformation process under the gravity in the natural world. Thin-plate spline based kernel transform is used to interpolate among the nodes of the finite elements. Experiments with both...
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