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A semi-automatic surface reconstruction framework based on T-Surfaces and isosurface extraction methods

Edilberto StraussWalter JiménezGilson A. GiraldiRodrigo SilvaAntonio A. F. Oliveira

In this paper we present a new approach which integrates the T-Surfaces model and isosurface genera-tion methods in a general framework for surface reconstruction in 3D medical images. T-Surfaces is a deformable model based on a triangulation of the image domain, a discrete surface model and an image threshold. Two types of isosurface generation methods are considered: the continuation ones and the marching ones. The former is useful during the reparameterization of T-Surfaces while the later is suitable to initialize the model closer the boundary. Specifically, in a first stage, the T-Surfaces grid and the threshold are used to define a coarser image resolution. This field is thresholded to get a 0-1 function which is processed by a marching method to generate polygonal surfaces whose interior may contain the desired objects. If a polygonal surface involves more than one object, then the resolution is increased in that region and the marching applied again. Next, we apply T-Surfaces to improved the result. If the obtained topology remains incorrect, we enable the user to modify the topology by an interac-tive method based on the T-Surfaces framework. Finally, we demonstrate the utility of diffusion methods for our approach.

http://sibgrapi.sid.inpe.br/rep-/sid.inpe.br/banon/2002/10.23.12.23

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