Sinduja Seshadri and Jonathan Scott
Patients wearing DBS or SCS implants experience RF heating when subjected to an MRI scan that operates at a frequency of 128 MHz. One technique is applying the concept of loss due to skin-effect on an implant lead wire at MRI frequency. A coaxial resonator of 1/4 wavelength with copper conductors was constructed to test the insertion loss using S12 parameter from a VNA. The smooth inner copper rod was compared with rough inner copper rod to determine the difference between the Q-value of the resonator. Roughening the surface does enhance the skin-effect loss but the loss is insufficient to translate it to an implant lead which is inserted in a patient.