Abstract
We present a physically-based deformable modelwhich can be used to track and to analyze non-rigidmotion of dynamic structures in time sequences of2D or 3D medical images. The model considers anobject undergoing an elastic deformation as a set ofmasses linked by springs, where the natural lengths ofthe springs is set equal to zero, and is replaced by a setof constant equilibrium forces, which characterize theshape of the elastic structure in the absence of externalforces. This model has ...

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