Partners and International Organizations
(English)
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Scuola Superiore Sant'Anna (I), Instituti Ortopedici Rizzoli (I), University Islas Balears (E), University of Bristol (UK), University Hospital Lund (S), Karl Storz GrnbH & Co (D), Swiss Federal Institute of Technology (CH), University of Geneva (CH)
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Abstract
(English)
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The objective of the MIAS project was to develop technologies for obtaining miniaturisation and enhancement of reality in arthroscopy in order to fulfil widely perceived and real requirements to the surgeon. The MIAS project aims to provide the surgeon with tools, which will enable her/him to improve the quality of the surgical intervention.
We have implemented the proposed hybrid method to deform soft tissues. This method consists of a mass spring system where mass points (particles) on the surface of the model are connected by springs. The motion of a particle is defined by its nature and by the position of the other particles in its neighborhood. In order to avoid behaviors of a surface object, curvature springs were created. During the implementation of the method, some strategies were updated in order to cope with the cartilage models that we obtained. Initially, we have planned to re-discretize the given model in order to produce a well sampled model having only four edges incident to each mass point. This discretization turned to be difficult to be done because of the non-symmetrical form of the cartillage. So we adapted our curvature springs to work with general triangulated surfaces. Now, each particle is attached by a spring to the center of mass of the neibours particles.
The implemented model takes into account a strategy to deform the surface when the medical tool touches it. This strategy is based on the identification of the vertices (or particles) of the surface colliding with the tool. These particles are then moved, according to the movement of the tool. With the movement of the particles, the physical model updates interactively the other particles, producing the expected deformation. The implementation was carried on PC platforms and works in interactive time.
Publications
L. Nedel, D. Thalmann, Anatomic Modeling of Deformable Human Bodies, The Visual Computer, Springer, (to appear).
L. Nedel, D. Thalmann, Modeling and Deformation of Human Body using an Anatomy-Based Approach, Proc. Computer Animation '98, Philadelphia, IEEE Computer Society Press, 1998, pp. 34-40.
L. Nedel, D.Thalmann, Real Time Muscle Deformations Using Mass-Spring Systems,
Proc. CGI '98, IEEE Computer Society Press, 1998.
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