A new approach to model boundary conditions in finite element method analysis of deep brain stimulation

In order to understand the mechanisms involved in deep brain stimulation, several finite element models have been made using reduced part of the head and simplified boundary conditions. In this study a new way to model the boundary conditions (BC) is proposed, starting from a whole head model in order to apply realistic BC, and then increasing the model resolution using an iterative procedure. We show the influence of these BC on the electric potential created by the stimulation. The comparison of the results with the ones obtained using the approach made in the previous studies show important variations of the value for the potential surrounding the electrode contact.