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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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