Determination of in-vivo temperature rise and gradient induced voltage during MRI of cut sacral neuromodulation leads

In-vitro tests and numerical simulations were made to determine the in-vivo temperature rise and during MRI of cut Neuromodulation leads (Medtronic 3889 and 3093) which were retained in-vivo after being used for treatment of urinary incontinence in women. The overall method follows the procedure described in ISO-IEC 10974. For retained lead length of 7-cm, maximum temperature rise for whole body SAR of 2 W/kg was 2.4 C at 1.5T and 3.7 C at 3T. Rises at the cut exceeded those at the electrode. These rises yield in-vivo temperature that is less than the maximum safe value for neurological tissues.

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