Abstract #1729

Measurement of radiofrequency absorption and thermal diffusion coefficients of brain tissue

David H Gultekin¹, Peter H Siegel^2,3, John T Vaughan¹, and John C Gore⁴

¹Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY, United States, ²Jet Propulsion Laboratory, National Aeronautics and Space Administration, Pasadena, CA, United States, ³Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, United States, ⁴Vanderbilt University Institute of Imaging Science, Nashville, TN, United States

A method is introduced to measure the absorption coefficient and the thermal diffusion coefficient of ex vivo brain tissue exposed to radiofrequency radiation emitted from a half wavelength dipole antenna and a rectangular waveguide using MRI and thermocouples. By analyzing the spatial and temporal variations of thermal gradients, it is possible to measure simultaneously both the absorption coefficient and the thermal diffusion coefficient in brain tissue in a single experiment.

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