Coupling Axis-Length Profiles with Bezier Splines in Finite Element Head Models

We built a realistically-shaped head volume conductor model using the finite element method (FEM). We lofted Bezier splines together to reduce the computational boundary complexity while preserving the geometrical structure. We based our spline reduction on coupling axis-length profile slopes of major and minor angular distances. We found that the optimal ratio of points per spline to the number of slices per tissue ranged from 1 to 1.5. We supported the structure reduction with an adaptive mesh, using quadratic-order tetrahedral basis elements with the highest resolution at the subdomain boundaries to maintain the geometric integrity.