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Abstract #2636

Safety of intracranial EEG recordings at 1.5T MR: electromagnetic field simulation on a human body model

Özlem Ipek1, Hassan Hawsawi2, Joao Jorge3, David W. Carmichael4, Louis Lemieux2, and Rolf Gruetter3,5

1Center for Biomedical Imaging (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, 2Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, London, United Kingdom, 3Laboratory of Functional and Metabolic Imaging, Ecole Polytechnique Fédérale de Laussanne (EPFL), Lausanne, Switzerland, 4Developmental Imaging and Biophysics Section, UCL Institute of Child Health, London, United Kingdom, 5Departments of Radiology, University of Lausanne and Geneva, Lausanne and Geneva, Switzerland

Excessive tissue heating is one of the major concerns when performing MRI in patients with icEEG due to the RF interaction between the electrodes and head tissue. No electromagnetic field simulations has been performed on in-vivo iEEG-MR setup due to the subgridding limitations of the small dimensions of these electrodes relative to those of the human body. We showed the feasibility of full body EM-field simulations based on realistic icEEG-electrode design. The proposed FDTD method for simultaneous icEEG-MRI gives results that are in broad agreement with previous experimental observations while allowing for measurements of SAR/heating along the entire implant length.

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