Investigation of ELF magnetically induced current inside the human body: Development of estimation tools and effect of organ conductivity

Regarding the possible biological effects caused by exposure to ELF (extremely low frequency) magnetic fields, magnetically induced current inside the human boldy has been a focus of research. To clarify the induced current characteristics inside the human body, we develop estimation tools. One was a numerical calculation code and the other was a human model. The numerical calculation code was based on a surface charge method. The human model was composed of several organs and other parts of the human body, whose shapes were spheroids or cylinders. Organs taken into account were the brain, heart, lungs, liver, and intestines. The validity of the calculation code was shown by comparing it with an analytical solution using a homogeneous spheroid model. The discrepancy was within 6.5%. Applicability of the code to the human body was shown. In addition, by applying the calculation code to the human model, effects of organ conductivity differences vis-a-vis the induced current distribution were estimated. It was found that the organ conductivity value very much affected the induced current distribution inside the human body. © 2000 Scripta Technica, Electr Eng Jpn, 134(2): 1–10, 2001

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