Abstract #1854
RF Heating on a Vagus Nerve Stimulation Device during Head Imaging in a 3T Transmit Body Coil using a Numerical Analysis
Mlina Bouldi 1,2 , Olivier David 1,2 , Stephan Chabardes 2,3 , Alexandre Krainik 2,3 , and Jan M Warnking 1,2
1
Universit Grenoble Alpes, Grenoble Institut
des Neurosciences, Grenoble, Rhne-Alpes, France,
2
U836,
Inserm, Grenoble, Rhne-Alpes, France,
3
CHU
de Grenoble, Rhne-Alpes, France
The MR safety of a vagus nerve stimulator was assessed.
Phantom experiments with a 3T whole-body transmit coil
showed heating by >3K at the electrodes. E-field maps
from electromagnetic simulations without the device show
prominent hot spots close to the path of the VNS
electrode, both in phantom and realistic human body
models. This configuration, not recommended by the
device manufacturer, indeed presents a significant risk,
with predicted high variability of actual heating in
patients dependent on the exact position of the
electrode at E-field hot-spots. Simulations may be able
to assess risks better than phantom experiments in this
context.
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