Dependence of RF-induced heating pattern during MRI of a single wire on its mode of entry in a dielectric medium

RF-induced heating of stereo encephalography (SEEG) electrodes during MRI scans could be of concern. Since the direction of entry of SEEG electrodes into brain can vary, heating of the tip of a single insulated copper wire (with bare tip) entering into a gel filled ASTM phantom axially (along the Z axis) and laterally (along the X axis) were measured as a function of the wire length. In this simple model of multi-wire multi-contact SEEG system, the resonating lengths (length with maximum heating) of the 2 configurations were same, while the lateral entry mode produced more heating.