Quantitative Relationship between SAR and Temperature Rise inside Eyeball in a Realistic Human Head Model for 1.5 GHz-Microwave Exposure Kiyofumi Taka

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1 Quantitative Relationship between SAR and Temperature Rise inside Eyeball in a Realistic Human Head Model for 1.5 GHz-Microwave Exposure Kiyofumi Takai, Non-member, Osamu Fujiwara, Member (Nagoya Institute of Technology) For investigating biological effects of a localized SAR (specific absorption rate) deposited in a human body for electromagnetic wave exposure, it is indispensable to graps a temperature-rise inside a human brain including the control center for the body temperature. This paper numerically analyzes a temperature-rise inside an eyeball of our developed realistic head model for 1.5 GHz microwave exposure, using the FD-TD (finite-difference time-domain) method. The computed results are validated in comparison with the data obtained by Taflove and his colleague. In order to examine a quantitative relationship between the localized SAR and temperature-rise, we also obtained a tissue amount over which the localized SAR should be averaged so as to well reflect the temperature-rise distribution inside the 2 T. IEE Japan, Vol. 118-C, No. 1, '98

2 Table 1. Electrical properties of tissues in realistic head model at 1.5 GHz. Fig. 2. Computation region and incident wave. Fig. 1. (a) Front view of realistic head model, (b) Horizontal cross section A-A' and (c ) Verti cal cross section B-B' along with the eye structure.

3 Table 2. Thermal parameters of Fig.3. SAR distribution along x axis passing through the center of the Fig.4. SAR distribution along J axis passing through the center of the 4 T. IEE Japan, Vol. 118-C, No. 1, '98

4 Fig. 5. Time change of calculated peak tempera ture rise in the Table 3. SAR and temperature rise in the

5 Fig. 6. Distribution of (a) normalized SAR and Fig. 7. Distribution of (a) normalized SAR and (b) normalized temperature rise in the horizontal (b) normalized temperature rise in the vertical cross section passing through the center of the cross section passing through the center of the 6 T. IEE Japan, Voi. 118-C, No. 1, 98

6 Fig. 8. Relationship between averaging weight n and residual squared sum Res(n). Fig. 9. Normalized SAR and normalized tempera ture rise along y axis passing through the center of (2) Om P. Gandhi, Ed : "Biological Effects and Medical Applica tions of Electromagnetic Energy, Prentice Hall", Englewood Cliffts, New Jersey (1990) (3) American National Standards Institute : "American National Standard Safty Levels with Respect to Human Exposure to R adio Frequency Electromagnetic Fields, 3 khz to 300 GHz", ANSI C (7) O. Fujiwara & A. Kato : "Computation of SAR inside Eyeball for 1.5-GHz Microwave Exposure Using Finite-Difference Time-Domain Technique", IEICE Trans, Commun., E77-B, No.6, (1994) (8) O. Fujiwara & M. Nomura : "Approximation of Surface-SAR in a Realistic Head Model for Microwave Exposure using Fig. 10. Normalized SAR and normalized temper External Magnetic Near-Fied", IEICE Trans. Commun., ature rise along z axis passing through the center of E78-B, No. 2, (1995)

7 (10) A. Taflove & M. E. Brodwin : "Computation of the Electro magnetic Fields and Induced Temperatures Within a Model of the Microwave-Irradiated Human Eye", IEEE Trans. MTT, MTT-23, No. 11, 888 `896 (1975) G. Mur: "Absorbing Boundary Conditions (11) for the Finite Difference Approximation of the Time-Domain Electromagnetic-Field IEEE Trans. Equations", EMC, EMC-23, No. 4, 377 `382 (1981) (12) á Î, R.D. Richtmyer & K. W. Morton : "Difference methods for initialvalue probrems, 2nd edition", John Wiley and Sons (1967) (14) N. Kritikos, K. R. Foster H. & H. P. Schwan : "Temperature Profiles in Spheres Due Electromagnetic Heating", to J. Microwave Power, (3 4), 327 ` & (1981) A. W. Guy, J. C. P.O. Kramer & F. Emery (15) Lin, A. : "Effect of 2450-MHz Radiation on the Rabbit Eye", IEEE Trans. MTT, MTT-23, No. 6, 492 `498 (1975) 8 T. IEE Japan, Vol. 118-C, No. 1, 98

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