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Interactive cuts through 3-dimensional soft tissue
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Author / Producer
Date
1998-11-11
Publication Type
Report
ETH Bibliography
yes
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Abstract
We describe a physically based framework for real-time modeling and interactive cutting of 3-dimensional soft tissue that can be used for surgery simulation. Unlike existing approaches which are mostly designed for tensorproduct grids our methods operate on tetrahedral decompositions giving more topological and geometric flexibility for the efficient modeling of complex anatomical struc tures. We start from an initial tetrahedralization such as being pro vided by any conventional meshing method. In order to track topological changes tetrahedra intersected by the virtual scalpel are split into substructures whose connectivity follows the trajec tory of the cut, which can be arbitrary. For the efficient computation of collisions between the scalpel and individual tetrahedra we devised a local collision detection algorithm. The underlying physics is approximated through masses and springs attached to each tetrahedral vertex and edge. A hierarchical Runge-Kutta iteration computes the relaxation of the system by traversing the designed data structures in a breadth-first order. The framework includes a force-feedback interface and uses real-time texture mapping to enhance the visual realism.
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Publication status
published
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Book title
Journal / series
Volume
309
Pages / Article No.
Publisher
ETH Zurich, Department of Computer Science
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Physically based modeling; Surgery simulation; Soft tissue; Tetrahedralization; Interactive cut; Virtual scalpel; Runge Kutta method
Organisational unit
02150 - Dep. Informatik / Dep. of Computer Science
Notes
Technical Reports D-INFK.