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

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6 Author(s)
Nyenhuis, J.A. ; Hillenbrand Biomed. Eng. Center, Purdue Univ., West Lafayette, IN, USA ; Kildishev, A.V. ; Bourland, J.D. ; Foster, K.S.
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The temperature rise in the vicinity of a medical implant due to the RF field in Magnetic Resonance Imaging (MRI) was evaluated. For the calculations, the implant was taken to be a conducting cylinder resembling 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 protocol 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°C) was about 3 times the control rise (0.23°C) with no implant. The calculations are consistent with experiment

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )