抄録
Image-guided surgery has been becoming a standard technique in the field of neurosurgery. However, brain shift throughout the surgical procedure has been a major issue affecting the spatial accuracy of conventional neuronavigation system. This study aims at developing the anatomically detailed three-dimensional finite element brain model and demonstrating the importance of the anatomical constraint of the falx cerebri with tentorium for prediction capability of gravity-induced brain shift. The model of brain parenchyma consisted of 253,278 tetrahedral elements whose material property was hyper-viscoelastic model presented in the literature. The computation of the gravity-induced brain shift by assuming that the patient was positioned lateral (left fronto-temporal craniotomy) was conducted using ABAQUS/Explicit. Deformation of the brain surface due to gravity after dura opening was demonstrated in 3D view under the anatomical constraint of the brain substructures. The illustrative results successfully demonstrated the prediction capability of brain shift using the developed model with the brain substructures.
