Modeling RF-Induced Power Deposition and Temperature Rise of Coaxial Leads with Helical Wires

The lead electromagnetic model (LEM) and the radiofrequency responses, i.e., the net dissipated electrode power and net temperature increase, above background, at the electrodes, were modelled for two coax-type insulated leads with inner and outer helical wires with a pitch of 0.35 mm. The quotient of the variances of the fitted LEM values and observed values (R²) of the radiofrequency responses was substantially different for the lead electrode versus the ring electrode, where R² of the ring quotient was a function of the duration of the RF-induced heating.