Heat equation inversion framework for average SAR calculation from magnetic resonance thermal imaging.
Bioelectromagnetics
; 37(7): 493-503, 2016 Oct.
Article
em En
| MEDLINE
| ID: mdl-27490064
ABSTRACT
Deposition of radiofrequency (RF) energy can be quantified via electric field or temperature change measurements. Magnetic resonance imaging has been used as a tool to measure three dimensional small temperature changes associated with RF radiation exposure. When duration of RF exposure is long, conversion from temperature change to specific absorption rate (SAR) is nontrivial due to prominent heat-diffusion and conduction effects. In this work, we demonstrated a method for calculation of SAR via an inversion of the heat equation including heat-diffusion and conduction effects. This method utilizes high-resolution three dimensional magnetic resonance temperature images and measured thermal properties of the phantom to achieve accurate calculation of SAR. Accuracy of the proposed method was analyzed with respect to operating frequency of a dipole antenna and parameters used in heat equation inversion. Bioelectromagnetics. 37493-503, 2016. © 2016 Wiley Periodicals, Inc.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ondas de Rádio
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Imageamento por Ressonância Magnética
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Absorção de Radiação
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Temperatura Alta
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article