On the Use of Conformal Models and Methods in Dosimetry for Nonuniform Field Exposure

Dragan Poliak, Mario Cvetkovic, Oriano Bottauscio, Akimasa Hirata, Ilkka Laakso, Esra Neufeld, Sylvain Reboux, Craig Warren, Antonios Giannopoulos, Fumie Costen

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Numerical artifacts affect the reliability of computational dosimetry of human exposure to low-frequency electromagnetic fields. In the guidelines of the International Commission of Non-Ionizing Radiation Protection, a reduction factor of 3 was considered to take into account numerical uncertainties when determining the limit values for human exposure. However, the rationale for this value is unsure. The IEEE International Committee on Electromagnetic Safety has published a research agenda to resolve numerical uncertainties in low-frequency dosimetry. For this purpose, intercomparison of results computed using different methods by different research groups is important. In previous intercomparison studies for low-frequency exposures, only a few computational methods were used, and the computational scenario was limited to a uniform magnetic field exposure. This study presents an application of various numerical techniques used: different finite-element method (FEM) schemes, method of moments, and boundary-element method (BEM) variants, and, finally, by using a hybrid FEM/BEM approach. As a computational example, the induced electric field in the brain by the coil used in transcranial magnetic stimulation is investigated. Intercomparison of the computational results is presented qualitatively. Some remarks are given for the effectiveness and limitations of application of the various computational methods.
Original languageEnglish
Pages (from-to)328-337
Number of pages10
JournalIEEE Transactions on Electromagnetic Compatibility
Issue number2
Early online date18 Jul 2017
Publication statusPublished - Apr 2018

Keywords / Materials (for Non-textual outputs)

  • Induced fields
  • low-frequency dosimetry
  • simplified brain model
  • sphere brain model


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