Heating near implanted medical devices by the MRI RF-magnetic field

The temperature rise in the vicinity of a medical implant due to the RF fie ld in Magnetic Resonance Imaging taken to be a conducting cylinder resembli ng the geometry of a commercial infusion pump. Measurements of temperature rise were made with the pump in a phantom in a clinical imager, The RF prot ocol was 20-minutes long and produced a specific absorption rate (SAR) of 0 .95 W/kg in the 34-kg phantom, In the measurements, the maximal temperature rise near the implant (0.66 degrees C) was about 3 times the control rise (0.23 degrees C) with no implant. The calculations are consistent with expe riment.