Document Detail


Distortion of millimeter-wave absorption in biological media due to presence of thermocouples and other objects.
MedLine Citation:
PMID:  11534836     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Specific absorption rate (SAR) distributions in the vicinity of a thermocouple or air bubble in water and in the presence of hair or sweat duct in skin were calculated using analytical and two-dimensional impedance methods. The objects were exposed to uniform 42.25 GHz plane electromagnetic fields. Insertion of a 0.1-mm thermocouple or similarly sized air bubble into water produced a strong localized disturbance of the otherwise uniform SAR distribution. However, the average of SAR values immediately surrounding the thermocouple was close to the undisturbed uniform average SAR. This allows measuring the average SAR during exposure of both unbounded and bounded media using calibrated small thermocouples (up to 0.1 mm). The SAR distribution in the vicinity of a hair was qualitatively similar to that produced by an air bubble. The maximal value of SAR was more than three times higher than the overall average SAR value in the skin. Sweat ducts produced a smaller disturbance of the millimeter-wave (mm-wave) field.
Authors:
S I Alekseev; M C Ziskin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  IEEE transactions on bio-medical engineering     Volume:  48     ISSN:  0018-9294     ISO Abbreviation:  IEEE Trans Biomed Eng     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-09-05     Completed Date:  2001-12-05     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0012737     Medline TA:  IEEE Trans Biomed Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1013-9     Citation Subset:  IM    
Affiliation:
Institute of Cell Biophysics of Russian Academy of Sciences, Pushchino, Moscow Region.
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MeSH Terms
Descriptor/Qualifier:
Absorption
Electric Impedance
Electromagnetic Fields*
Hair / radiation effects
Humans
Mathematics
Signal Processing, Computer-Assisted
Skin / radiation effects*
Skin Temperature / radiation effects*
Sweat Glands / radiation effects
Thermography / instrumentation
Water
Chemical
Reg. No./Substance:
7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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