Variability in Specific Absorption Rate From Variation in Tissue Properties

This study evaluates the variance of specific absorption rate (SAR) due to expected variance in the dielectric properties of tissues in a 3D anatomical human head model exposed to a half-wave dipole antenna at 835 and 1900 MHz. Stochastic finite difference time domain (S-FDTD) is applied to calculat...

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Bibliographic Details
Published in:IEEE journal on multiscale and multiphysics computational techniques 2022, Vol.7, p.304-311
Main Authors: Masumnia-Bisheh, Khadijeh, Furse, Cynthia
Format: Article
Language:English
Subjects:
Absorption
Biological effects of electromagnetic radiation
biological tissues
Computational modeling
Dielectric properties
Dipole antennas
Electrical properties
Finite difference methods
Finite difference time domain method
Mathematical models
Monte Carlo methods
Specific absorption rate (SAR)
Stochastic finite difference time domain (S-FDTD) method
Three-dimensional displays
Time-domain analysis
Uncertainty
Variance
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Summary:This study evaluates the variance of specific absorption rate (SAR) due to expected variance in the dielectric properties of tissues in a 3D anatomical human head model exposed to a half-wave dipole antenna at 835 and 1900 MHz. Stochastic finite difference time domain (S-FDTD) is applied to calculate variations in the local SAR, and the 1- and 10-gram averaged SAR values. These are also compared at 835 MHz to variations found from Monte Carlo FDTD. It is found that for both frequencies dielectric property variance results in a variance of peak 1- or 10-gram SAR of approximately 30% to 55% of the mean SAR, depending on the frequency. These results show that to reach 95% confidence with the calculated SAR values for evaluating exposure guidelines, statistical variations in tissue electrical properties must be taken into account.
ISSN:2379-8815
2379-8793
2379-8815
DOI:10.1109/JMMCT.2022.3216642