Abstract #4180

Concurrent scalp and intracranial electroencephalography recording in a human 1.5T MRI scanner: RF-induced heating assessment

Hassan B Hawsawi^1,2,3, Anastasia Papadaki^4,5, Vejay N Vakharia⁶, John S Thornton^4,5, David W Carmichael^7,8, and Louis Lemieux^1,2

¹Department of Clinical and Experimental Epilepsy, University College London, London, United Kingdom, ²Department of Clinical and Experimental Epilepsy, Epilepsy Society, Buckinghamshire, United Kingdom, ³Administration of Medical Physics, King Abdullah Medical City (KAMC), Makkah, Saudi Arabia, ⁴Lysholm Department of Neuroradiology, UCLH NHS Trust, London, United Kingdom, ⁵Department of Brain Repair and Rehabilitation, UCL Institute of Neurology, London, United Kingdom, ⁶Department of Experimental Epilepsy, National Hospital for Neurology and Neurosurgery, London, United Kingdom, ⁷Developmental Imaging and Biophysics Section, UCL Great Ormond Street Institute of Child Health, London, United Kingdom, ⁸Wellcome EPSRC Centre for Medical Engineering, King's College London, London, United Kingdom

The acquisition of electroencephalography (EEG) concurrently with functional magnetic resonance imaging (fMRI) requires careful consideration of the health hazards resulting from interactions between the scanner’s electromagnetic fields and EEG recording equipment. with excessive RF-induced heating near the electrodes being the main one. In view of performing concurrent scalp and intracranial EEG-MRI, we measured heating in the vicinity of electrodes placed within and on a phantom during high-SAR sequences in two conditions: with intracranial electrodes only, and following the addition of scalp electrodes. Temperature variations were well within the safety guidelines at all measurement locations in both conditions.

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