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Temperature field simulation and phantom validation of a Two-armed Spiral Antenna for microwave thermotherapy

Issue title: Papers from the 4th International Conference on Biomedical Engineering and Biotechnology (ICBEB2015), 18-21 August 2015, Shanghai, China ``New Paradigms for Biomedical Engineering and Biotechnology''

Article type: Research Article

Authors: Du, Yongxinga | Zhang, Lingzeb | Sang, Lulua | Wu, Daochengb; *

Affiliations: [a] Inner Mongolia University of Science and Technology, Baotou, Mongolia, China | [b] Xi'an Jiaotong University, Xi'an, Shaanxi, China

Correspondence: [*] Corresponding author: Daocheng Wu, Xi'an Jiaotong University, Xi'an, Shaanxi, China. E-mail:wudaocheng@mail.xjtu.edu.cn

Keywords: Archimedean planar spiral antenna, finite-difference-Bioheat equation (FD-BHE) methods, microwave thermotherapy, phantom

DOI: 10.3233/THC-161195

Journal: Technology and Health Care, vol. 24, no. s2, pp. S675-S682, 2016

Published: 13 June 2016
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Abstract

In this paper, an Archimedean planar spiral antenna for the application of thermotherapy was designed. This type of antenna was chosen for its compact structure, flexible application and wide heating area. The temperature field generated by the use of this Two-armed Spiral Antenna in a muscle-equivalent phantom was simulated and subsequently validated by experimentation. First, the specific absorption rate (SAR) of the field was calculated using the Finite Element Method (FEM) by Ansoft's High Frequency Structure Simulation (HFSS). Then, the temperature elevation in the phantom was simulated by an explicit finite difference approximation of the bioheat equation (BHE). The temperature distribution was then validated by a phantom heating experiment. The results showed that this antenna had a good heating ability and a wide heating area. A comparison between the calculation and the measurement showed a fair agreement in the temperature elevation. The validated model could be applied for the analysis of electromagnetic-temperature distribution in phantoms during the process of antenna design or thermotherapy experimentation.

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