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On the use of Compound and Extracted Models in Thermal Dosimetry Assessment

The paper deals with thermal analysis of realistic models of the human eye and brain using the finite element method. The research presented in this paper is the sequel to the electromagnetic dosimetry model presented in the previous work by the authors. The paper presents the numerical results for the specific absorption rate (SAR) and the related temperature increase in various models of the human eye and the brain/head exposed to high frequency (HF) electromagnetic (EM) radiation. Based on the numerical results for the induced electric field, the distribution of SAR in the human brain and human eye is determined, subsequently used as input to the thermal model. The thermal dosimetry model of both brain and eye are based on the form of Pennes’ bioheat transfer equation numerically solved using the finite element method (FEM). The comparison between the extracted models and the compound models of both eye and brain, placed inside realistic head model is presented. In case of the human eye, generally comparable results were obtained for both SAR and temperature increase, while the compound eye model is found to be more suitable when the polarization of incident wave is considered. Moreover, the extracted eye model underestimated the temperature rise, attributed to better heat exchange compared to the compound model. The results for the compound eye indicate that in some situation, the eye lens could be omitted from simulation, facilitating the model preparation. The numerical results for all three brain models showed similar distributions of SAR and temperature rise. Also, the obtained results show that the peak SAR does not exceed the basic restriction limit for localized SAR, for occupational exposure. The thermal dosimetry assessment of the human brain exposed in four considered scenarios indicate the temperature should not exceed 0.1°C. Finally, the use of a geometrically simplified models may also be found useful in the initial dosimetry assessment prior to dealing with models with more anatomical features.

finite element method ; hybrid method ; thermal dosimetry ; electromagnetic dosimetry ; human eye ; human head

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