抄録
We have developed novel three-dimensional finite element brain model (previously reported whole model) with material property of hyper elastic feature, which successfully demonstrated the intraoperative deformation simulation. However, shortening of computation time was essential for the real-time simulation. In this study, a parametric study to evaluate the difference of constitutive models affects both deformation results and computational time of simulation. Hyper and linear elastic models performed both gravity induced brain shift after fronto-temporal craniotomy and cerebellar hemispheric retraction by spatula for the posterior fossa surgery. The gravity induced brain shift simulation using the linear elastic material model successfully achieved up to 51% reduction of computation time compared with hyper elastic one within acceptable displacement error. Cerebellar retraction simulation also showed acceptable deformation results in both models, while in pressure analysis, an obvious underestimation in liner elastic one. Our results showed the usefulness of linear elastic model in gravity induced simulation for the reduction of computation time. On the other hand, careful attention was needed in the evaluation of pressure analysis by surgical maneuver when using linear elastic model.
