Scattering of the MRI field at 1.5T by a Vagus Nerve Stimulation implant

We have investigated the scattering of the magnetic resonance imaging (MRI) RF electromagnetic field by implants for vagus nerve stimulation (VNS) therapy using the finite element method to perform full 3-D realistic simulations. For an implanted VNS lead, we calculated the RF scattered field and the heat equation was solved using an FEM tool to find the temperature rise. Current distributions in the twin-strand lead, specific absorption rate (SAR) and temperature rise distributions are presented.