Abstract #1372
Determination of in-vivo temperature rise and gradient induced voltage during MRI of cut sacral neuromodulation leads
John Nyenhuis 1 and John Welter 2
1
Electrical and Computer Engineering, Purdue
University, West Lafayette, Indiana, United States,
2
Neuromodulation,
Medtronic, Minneapolis, Minnesota, United States
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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