title: Modelling anisotropic viscoelasticity for real-time soft tissue simulation.
abstract: Previously almost all biomechanically-based time-critical surgical simulation has ignored the well established features of tissue mechanical response of anisotropy and time-dependence. We address this issue by presenting an efficient solution procedure for anisotropic viscohyperelastic constitutive models which allows use of these in nonlinear explicit dynamic finite element algorithms. We show that the procedure allows incorporation of both anisotropy and viscoelasticity for as little as 5.1% additional cost compared with the usual isotropic elastic models. When combined with high performance GPU execution the complete framework is suitable for time-critical simulation applications such as interactive surgical simulation and intraoperative image registration.
authors.affiliation: Centre for Medical Image Computing, University College London, Gower St, London, WC1E 6BT, UK. z.taylor@cs.ucl.ac.uk
authors.forename: Zeike A
authors.initials: ZA
authors.lastname: Taylor
authors.forename: Olivier
authors.initials: O
authors.lastname: Comas
authors.forename: Mario
authors.initials: M
authors.lastname: Cheng
authors.forename: Josh
authors.initials: J
authors.lastname: Passenger
authors.forename: David J
authors.initials: DJ
authors.lastname: Hawkes
authors.forename: David
authors.initials: D
authors.lastname: Atkinson
authors.forename: Sébastien
authors.initials: S
authors.lastname: Ourselin
mesh_terms: D000818:Animals; D016880:Anisotropy; D003198:Computer Simulation; D003199:Computer Systems; D003238:Connective Tissue / Q000502:physiology*; D004548:Elasticity; D006244:Hardness; D006801:Humans; D008954:Models, Biological; D013314:Stress, Mechanical; D014783:Viscosity