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An implanted spherical head model exposed to electromagnetic fields at a mobile communication frequency.

S M S Reyhani1, Simone A Ludwig

  • 1Department of Information Systems and Computing, Brunel University, Uxbridge, Middlesex UB8 3PH, UK. smsreyhani@ieee.org

IEEE Transactions on Bio-Medical Engineering
|October 6, 2006
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Summary

Mobile phones may affect implantable medical devices. This study investigates electromagnetic wave scattering from implants in a head model, comparing analytical and FDTD methods to ensure safety.

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Area of Science:

  • Electromagnetics
  • Biomedical Engineering
  • Medical Device Safety

Background:

  • Concerns exist regarding the potential adverse effects of non-ionizing radiation from personal communication systems on active or passive implantable medical devices.
  • Minimizing harmful interactions between mobile phones and implants is crucial for public safety and improving device performance.

Purpose of the Study:

  • To investigate the electromagnetic wave scattering from implantable medical devices within a human head model.
  • To analyze the interaction between mobile phone antennas and implanted medical devices.
  • To validate a novel analytical method against a numerical simulation for implant-EM interaction.

Main Methods:

  • Developed an analytical model using the dyadic Green's function (DGF) for spherical vector wave functions.
  • Simulated electromagnetic wave scattering from a perfectly conducting implant (wire and disk) eccentrically embedded in a spherical head model.
  • Utilized a dipole antenna at 900 MHz and compared results with the finite-difference time-domain (FDTD) electromagnetic simulator.

Main Results:

  • Obtained analytical expressions for the scattered electromagnetic fields of the implant-embedded head model.
  • Computed numerical results from the analytical expressions.
  • Demonstrated good agreement between the proposed analytical method and the FDTD simulation results.

Conclusions:

  • The analytical method provides accurate predictions for electromagnetic wave scattering from implants in a head model.
  • The findings contribute to understanding and mitigating potential adverse effects of mobile phones on implantable medical devices.
  • Validated simulation techniques can enhance the design of safer medical implants and mobile communication devices.