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Abstract #3230

Radiofrequency-induced heating of intracranial stereo-EEG electrodes during MRI: a phantom study

Annie Papadaki 1,2 , David Carmichael 3 , Mark James White 1,2 , Hoskote Chandrashekar 1 , Tarek Yousry 1,2 , Beate Diehl 4,5 , Louis Lemieux 4 , and John Stephen Thornton 1,2

1 Lysholm Department of Neuroradiology, National Hospital for Neurology and Neurosurgery, UCLH, London, London, United Kingdom, 2 Department of Brain Repair and Rehabilitation, UCL Institute of Neurology, London, London, United Kingdom, 3 Imaging and Biophysics Unit, UCL Institute of Child Health, London, United Kingdom, 4 Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, London, United Kingdom, 5 Department of Neurophysiology, National Hospital for Neurology and Neurosurgery, UCLH, London, United Kingdom

In this study we assessed temperature changes (∆T) during MRI at the tip of Stereo-electroencephalography (SEEG) electrodes in a phantom. Fibre optic thermometry measurements at the tip of two electrodes were performed at 1.5T and 3T, during a high SAR TSE sequence and an fMRI EPI sequence. Different electrode tail terminations were tested to match possible clinical scenarios. Scanning with electrode tails only, the maximum ∆T did not exceed 1C at 1.5T, while it exceeded the guideline limits at 3T. Connecting extension cables and varying the cable termination has a significant effect in RF-induced heating

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