Abstract #2644

Numerical Simulation of Specific Absorption Rate (SAR) Induced in the Head as a Function of EEG Lead Conductivity during 256-channel dEEG/fMRI at 3T.

Seyed Reza Atefi^1,2, Peter Serano³, Catherine Poulsen⁴, and Giorgio Bonmassar^1,2

¹Harvard Medical School, Boston, MA, United States, ²Massachusetts General Hospital, Boston, MA, United States, ³Mechanical Engineering, University of Maryland, MD, United States, ⁴Electrical Geodesics Inc., OR, United States

This study presents the numerical quantification of the relationship between the EEG lead conductivity and SAR induced in the head in EEG-fMRI at 3T and using a 256-channel dense array sensor net. SAR induced in the head normalized by the gold standard of no sensor net was an S-curve function of the EEG lead conductivity in the range 1S/m - 5.8^.10⁷ S/m, plateauing at 1 for lead conductivities below 10 S/m.

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