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Postresonance electromagnetic absorption by man and animals

H Massoudi, C H Durney, P W Barber

    Bioelectromagnetics
    |January 1, 1982
    PubMed
    Summary
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    This study introduces a surface integral equation (SIE) method to calculate specific absorption rate (SAR) in biological models. The SIE method provides accurate SAR calculations for electromagnetic wave exposure across new frequency ranges.

    Area of Science:

    • Computational electromagnetics
    • Bioelectromagnetics
    • Numerical methods

    Background:

    • Accurate calculation of specific absorption rate (SAR) is crucial for understanding biological effects of electromagnetic (EM) fields.
    • Previous computational methods had limitations in frequency range for biological models.

    Purpose of the Study:

    • To calculate SAR in spherically capped cylindrical models using a surface integral equation (SIE) method.
    • To extend SAR calculations to previously unavailable frequency ranges (80-400 MHz).

    Main Methods:

    • Utilized the surface integral equation (SIE) method to formulate EM field relations.
    • Formulated relations in terms of electric and magnetic currents on the model surface.
    • Calculated average SAR from far scattered EM fields using the forward scattering theorem.

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    Main Results:

    • SIE method successfully calculated SAR for man models from 80-400 MHz.
    • SIE results agreed with extended boundary condition method (EBCM) up to 80 MHz.
    • Reasonable agreement was found with experimental data for rat models (1-3 GHz).

    Conclusions:

    • The SIE method is effective for calculating SAR in biological models across extended frequency ranges.
    • This method overcomes limitations of previous techniques, enabling new research avenues.
    • Validated SIE results against established methods and limited experimental data.