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Approximation of SurfaceSAR in a Realistic Head Model for Microwave Exposure Using External Magnetic NearField
Osamu FUJIWARA Michihiko NOMURA
Publication
IEICE TRANSACTIONS on Communications
Vol.E78B
No.2
pp.140144 Publication Date: 1995/02/25 Online ISSN:
DOI: Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Compatibility) Category: Keyword: microwave bioeffect, realistic head model, FDTD technique, surfaceSAR, external magnetic nearfield,
Full Text: PDF(428.6KB)>>
Summary:
A method is described for approximately estimating the surface specificabsorptionrate (SAR) in an anatomically realistic model of the human head for microwave exposure using the external magnetic nearfield. The finitedifference timedomain (FDTD) technique is used to compute the electromagnetic fields in the head model for 750MHz and 1.5GHz farfield exposures with the 1991 ANSI specified safety level. The spatial pattern tracking between the onegram averaged surfaceSAR and external magnetic nearfield is demonstrated on the horizontal cross sectional perimeter of the head model. The regression coefficients between them are also obtained on the fiftyfive horizontal cross sectional perimeters, which could give an approximate value of the surfaceSAR in an acutual head, if the external magnetic nearfield would be measured. This is validated by the theoretical results in a semiinfinite homogeneous flat model for normal incidence microwave exposure.


