David H Gultekin1, Peter H Siegel2,3, 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
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
It is important to quantify the radio frequency absorption and thermal diffusion in the tissues through the measurements of the absorption and thermal diffusion coefficients specific to the tissue properties.
MRI temperature maps of ex vivo brain tissue exposed to a 1.9 GHz half wavelength (λ/2) dipole antenna placed on the left side of the container. The hot spots correspond to RF exposures of 12 minutes time and 2W power. These two images are from two different ex vivo brain tissues and experiments.
A 1.9 GHz half wavelength (λ/2) dipole antenna (left) and a 1.9 GHz rectangular waveguide (WR-430) RF source (right) placed against the ex vivo bovine brain tissue in the cubical plastic containers.