Tetrahedral mass spring model for fast soft tissue deformation

Authors:
Wouter Mollemans;Filip Schutyser;Johan Van Cleynenbreugel;Paul Suetens
Affiliations:
Medical Image Computing, Radiology and ESAT/PSI, Faculties of Medicine and Engineering, University Hospital GasthuisBerg, Leuven, Belgium;Medical Image Computing, Radiology and ESAT/PSI, Faculties of Medicine and Engineering, University Hospital GasthuisBerg, Leuven, Belgium;Medical Image Computing, Radiology and ESAT/PSI, Faculties of Medicine and Engineering, University Hospital GasthuisBerg, Leuven, Belgium;Medical Image Computing, Radiology and ESAT/PSI, Faculties of Medicine and Engineering, University Hospital GasthuisBerg, Leuven, Belgium
Venue:
IS4TM'03 Proceedings of the 2003 international conference on Surgery simulation and soft tissue modeling
Year:
2003

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Abstract

Maxillofacial surgery treats abnormalities of the skeleton of the head. Skull remodelling implies osteotomies, bone fragment repositioning, restoration of bone defects, inserting implants, .... Recently, the use of 3D image-based surgery planning systems is more and more accepted in this field. Although the bone-related planning concepts and methods are maturing, prediction of soft tissue deformation needs further fundamental research. In this paper we present a tetrahedral soft tissue model that can be used in a surgery planning system to predict soft tissue changes due to skeletal changes. Our model consists of mass points connected by springs. We propose a way to directly calculate the deformation of the model due to external changes. To achieve fast calculations we take advantage of the fact that most deformations are local and we compare our results with pre-computed reference models, to prove the accuracy of our model.