RF-induced heating of an entirely insulated partially implanted conducting wire in a gel phantom was measured at two different 3 tesla systems with a receive-only spine matrix coil. Presence of inner spiral-wound stainless steel helix in Arrow AK-05502 intrathecal catheters raises concern about possible RF-induced heating during MRI. Temperature of the catheter was measured by using fiber optic sensors with fluoroptic monitoring with the catheter inserted into an ASTM gel phantom. Different configurations representing in vivo settings were tested at different E-fields in the phantom. No significant heating was observed in any of the configurations.