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A three-dimensional method for calculating currents induced in bodies by extremely low-frequency electric fields.

T Takuma1, T Kawamoto, K Isaka

  • 1Kyushu University, Fukuoka, Japan.

Bioelectromagnetics
|January 1, 1990
PubMed
Summary

A new numerical program calculates induced currents in human and animal models exposed to extremely-low-frequency (ELF) electric fields. This charge-simulation method (CSM) shows good agreement with experimental values for total induced current.

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Area of Science:

  • Biophysics
  • Computational Electromagnetics
  • Bioelectromagnetics

Background:

  • Accurate calculation of induced currents in biological models is crucial for understanding electromagnetic field effects.
  • Existing methods may lack user-friendliness or fail to fully capture the three-dimensional (3-D) nature of complex models and fields.

Purpose of the Study:

  • To develop and present a user-friendly numerical program for calculating induced currents in 3-D human and animal models.
  • To validate the program's accuracy using experimental data from a baboon model exposed to extremely-low-frequency (ELF) electric fields.

Main Methods:

  • The program employs a charge-simulation method (CSM) to model subjects as combinations of simple geometric blocks (spheres, cylinders, cones).
  • Input data for block dimensions, positions, and charge levels are prepared for 3-D arrangements, with special blocks for irregular shapes.

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  • Calculations account for the 3-D character of ELF electric fields and the exposed models.

    • Main Results:

    • The program successfully calculated induced currents in a baboon model in various postures (standing, quadrupedal, sitting).
    • Total induced current calculations showed very good agreement with experimental measurements.
    • Local current calculations exhibited variability, ranging from 5% to 17% of measured values in specific areas like the head.

    Conclusions:

    • The developed CSM-based program provides a user-friendly and accurate tool for estimating induced currents in complex biological models.
    • The method demonstrates good overall accuracy for total induced currents, though local current estimations may have higher variability.
    • Further investigation into block dimension and level selection is recommended to refine local current predictions.