Document Detail


Effects of tissue conductivity and electrode area on internal electric fields in a numerical human model for ELF contact current exposures.
MedLine Citation:
PMID:  22538267     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Contact currents flow through the human body when a conducting object with different potential is touched. There are limited reports on numerical dosimetry for contact current exposure compared with electromagnetic field exposures. In this study, using an anatomical human adult male model, we performed numerical calculation of internal electric fields resulting from 60 Hz contact current flowing from the left hand to the left foot as a basis case. Next, we performed a variety of similar calculations with varying tissue conductivity and contact area, and compared the results with the basis case. We found that very low conductivity of skin and a small electrode size enhanced the internal fields in the muscle, subcutaneous fat and skin close to the contact region. The 99th percentile value of the fields in a particular tissue type did not reliably account for these fields near the electrode. In the arm and leg, the internal fields for the muscle anisotropy were identical to those in the isotropy case using a conductivity value longitudinal to the muscle fibre. Furthermore, the internal fields in the tissues abreast of the joints such as the wrist and the elbow, including low conductivity tissues, as well as the electrode contact region, exceeded the ICNIRP basic restriction for the general public with contact current as the reference level value.
Authors:
H Tarao; H Kuisti; L Korpinen; N Hayashi; K Isaka
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-26
Journal Detail:
Title:  Physics in medicine and biology     Volume:  57     ISSN:  1361-6560     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401220     Medline TA:  Phys Med Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  2981-2996     Citation Subset:  -    
Affiliation:
Department of Electrical and Computer Engineering, Kagawa National College of Technology, 355 Chokushi-cho, Takamatsu-shi, Kagawa 761-8058, Japan. Tampere University of Technology, Korkeakoulunkatu 10, FI-33720 Tampare PO Box 527, FI-33101 Tampare, Finland.
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