Estudo da radiação eletromagnetica na cabeça humana considerando efeitos quirais / Study of the electromagnetic radiation on the human head considering chiral effects

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

This work shows a numerical model based on the finite-difference time-domain method, with the aim of analysing the characteristics of the Specific Absorption Rate, SAR, in a human-head, through a quiral modeling of Mawell?s equations. The formulation is expressed in terms of the electric and magnetic wave-fields, allowing to investigate possible changes in SAR, inside the human head, for different values of chirality, using simple algorithms. Such algorithms, make the analysis of the several characteristics of SAR in bidimensional structures representing the transversal layers of the human head, discretized in its tissues possessing significant volumes. A verification was made by calculating the numerical punctual stability and by simulating a punctual source in a chiral medium. The influences of the equivalent impedances of the antenna and of the distance between the antenna and the human head are analysed, for different chiral values, as well as an analysis of the average local SAR and its percentual variation for chosen chiral values. Five transversal layers were analysed, with the aim of verifying global characteristics and behaviors of SAR, avoiding that local variations were assumed as a global effect

ASSUNTO(S)

eletromagnetismo chirality diferenças finitas finite difference method quiralidade cabeça - efeito da radiação electromagnetics effects of radiation on the head

ACESSO AO ARTIGO

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