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 Gruetter^3,5

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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