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Abstract #4180

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

Hassan B Hawsawi1,2,3, Anastasia Papadaki4,5, Vejay N Vakharia6, John S Thornton4,5, David W Carmichael7,8, and Louis Lemieux1,2

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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