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Evaluation of accuracy of non-linear finite element computations for surgical simulation: study using brain phantom

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In this paper, the accuracy of non-linear finite element computations in application to surgical simulation was evaluated by comparing the experiment and modelling of indentation of the human brain phantom. The evaluation was realised by comparing forces acting on the indenter and the deformation of the brain phantom. The deformation of the brain phantom was measured by tracking 3D motions of X-ray opaque markers, placed within the brain phantom using a custom-built bi-plane X-ray image intensifier system. The model was implemented using the ABAQUSTM finite element solver. Realistic geometry obtained from magnetic resonance images and specific constitutive properties determined through compression tests were used in the model. The model accurately predicted the indentation force-displacement relations and marker displacements. Good agreement between modelling and experimental results verifies the reliability of the finite element modelling techniques used in this study and confirms the predictive power of these techniques in surgical simulation.
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Keywords: bi-plane X-ray image intensifier system; finite element method; surgical simulation

Document Type: Research Article

Affiliations: 1: Intelligent Systems for Medicine Laboratory, School of Mechanical Engineering, The University of Western Australia, Perth-Crawley, Western Australia, Australia 2: Surgical Assist Technology Group, Institute for Human Science and Biomedical Engineering, National Institute of Advanced Industrial Science and Technology, Ibaraki, Japan

Publication date: 01 December 2010

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