Comparison of measurement and calculation of the electric field transfer function for an active implant lead in different media

Patients with an active implantable medical device (AIMD) may be at risk of harm from RF-induced heating during an MRI scan. The electric field transfer function (TFE) is a measure of the sensitivity of the heating at the electrode of the AIMD to the incident tangential electric field (Etan) along its length. It is demonstrated that the TFE depends on boundaries of the phantom, phantom media and the trajectory of the AIMD.