Research Article A Study on the Use of Compound and Extracted Models in the High Frequency Electromagnetic Exposure Assessment Mario CvetkoviT, 1 Hrvoje Dodig, 2 and Dragan Poljak 1 1 Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, R. Boˇ skovi´ ca 32, 21000 Split, Croatia 2 Faculty of Maritime Studies, University of Split, R. Boˇ skovi´ ca 37, 21000 Split, Croatia Correspondence should be addressed to Mario Cvetkovi´ c; mcvetkov@fesb.hr Received 12 July 2017; Accepted 12 October 2017; Published 26 November 2017 Academic Editor: Peter Dabnichki Copyright © 2017 Mario Cvetkovi´ c et al. Tis is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Te paper presents the numerical results for the induced electric feld in the various models of the human eye and the head. Te comparison between the extracted or the single organ models and the compound organ models placed inside realistic head models obtained from the magnetic resonance imaging scans is presented. Te numerical results for several frequencies and polarizations of the incident electromagnetic (EM) plane wave are obtained using the hybrid fnite element method/boundary element method (FEM/BEM) formulation and the surface integral equation (SIE) based formulation featuring the use of method of moments, respectively. Although some previous analysis showed the similar distribution of the induced electric feld along the pupillary axis obtained in both eye models, this study showed this not to be the case in general. Te analysis showed that the compound eye model is much more suitable when taking into account the polarization of the incident EM wave. Te numerical results for the brain models showed much better agreement in the maximum values and distributions of the induced surface feld between detailed models, while homogeneous brain model showed better agreement with the compound model in the distribution along selected sagittal axis points. Te analysis could provide some helpful insights when carrying out the dosimetric analysis of the human eye and the head/brain exposed to high frequency EM radiation. 1. Introduction Te electromagnetic (EM) felds generated by the various wireless communication equipment such as mobile phones and base station antennas have increased the concern among the general population related to the possible harmful efects. As the established biological efect of high frequency (HF) electromagnetic felds is tissue heating, the assessment of this HF exposure is based on determining the specifc absorption rate (SAR) that is related to the electric feld induced in the tissue. Te HF exposure assessment is particularly important in the case of human eye and brain since experimental mea- surement in healthy humans is very difcult if not impossible. Te solution to this is the use of the computational models and the related numerical solutions as a tool for assessment of HF exposure [1–3]. Te computational models employed for this particular type of assessment can be classifed as realistic models of the human body (or particular organs of interest) based on the magnetic resonance imaging (MRI) (e.g. [4]) or the simplifed models, computationally much less demanding but failing to provide accurate results in most of the exposure scenarios [5]. Te detailed models of the complete human body are nowadays readily available (e.g., [6, 7]); however, the detailed human body model puts the signifcant burden in the computational model preparation at the same time putting strain on the available computational resources. In addition to this, there are cases when only the particular organ or body parts are of research interest, as when the initial assessment is considered. Te selection between the simplifed single organ model and the more detailed and complete body model is not simple nor straightforward. Tis paper is an extension of recent study [8] on the comparison of the results between the compound and the extracted eye models, respectively, exposed to 1 GHz electromagnetic plane wave at single polarization. Tis paper Hindawi Mathematical Problems in Engineering Volume 2017, Article ID 7932604, 12 pages https://doi.org/10.1155/2017/7932604