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Banded matrix approach to Finite Element modelling for soft tissue simulation

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Abstract

Realistic deformation of computer-simulated anatomica structures is computationally intensive. As a result, simple methodologies not based in continuum mechanics have been employed for achieving real-time deformation of virtual anatomy. Since the graphical interpolations and simple spring models commonly used in these simulations are not based on the biomechanical properties of tissue structures, these ‘quick and dirty” methods typically do not represent accurately the complex deformations and force-feedback interactions that can take place during surgery. Finite Element (FE) analysis is widely regarded as the most appropriate alternative to these methods. Extensive research has been directed toward applying this method to modelling a wide range of biological structures, and a few simple FE models have been incorporated into surgical simulations. However, because of the highly computational nature of the FE method, its direct application to real-time force-feedback and visualisation of tissue deformation has not been practical for most simulations. This limitation is due primarily to the overabundance of information provided by the standard FE approaches. If the mathematics are optimised through preprocessing to yield only the information essential to the simulation task, run-time computation requirements can be reduced drastically. We are currently developing such methodologies, and have created computer demonstrations that support real-time interaction with soft tissue. To illustrate the efficacy and utility of these fast “banded matrix” FE methods, we present results from a skin suturing simulator which we are developing on a PC-based platform.

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Authors and Affiliations

  1. Human Interface Lab, Hayes Gladstone, University of Washington, Seattle, WA, USA

    J. Berkley & S. Weghorst

  2. Division of Dermatology, University of Washington, Seattle, WA, USA

    H. Gladstone, G. Raugi & D. Berg

  3. Department of Mechanical Engineering, University of Washington, Seattle, WA, USA

    M. Ganter

Authors
  1. J. Berkley
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  2. S. Weghorst
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  3. H. Gladstone
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  4. G. Raugi
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  5. D. Berg
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  6. M. Ganter
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Correspondence to J. Berkley.

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Berkley, J., Weghorst, S., Gladstone, H. et al. Banded matrix approach to Finite Element modelling for soft tissue simulation. Virtual Reality 4, 203–212 (1999). https://doi.org/10.1007/BF01418156

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