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SAR and thermal response effects of a two-arm Archimedean spiral coil in a magnetic induction sensor on a human head

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 4th International Conference on Biomedical Engineering and Biotechnology, 18–21 August 2015, Shanghai, China

Guest editors: Feng Liu, Dong-Hoon Lee, Ricardo Lagoa and Sandeep Kumar

Article type: Research Article

Authors: Zhang, Ziyia; b; * | Liu, Peiguob | Zhou, Dongmingb | Zhang, Lianga; b | Ding, Liangb

Affiliations: [a] College of Science, National University of Defense Technology, Changsha, Hunan 410073, China | [b] State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics & Information System, National University of Defense Technology, Changsha, Hunan 410073, China

Correspondence: [*] Address for correspondence: Ziyi Zhang, Room 605, Electromagnetic Environment Laboratory Building, College of Electronic Science and Engineering, National University of Defense Technology, 109 Deya Road, Kaifu District, Changsha, Hunan 410073, China. Tel.: +86 0731 84576219 15; Fax: +86 0731 84576219; E-mail: ziyizhang@nudt.edu.cn.

Keywords: Specific absorption rate (SAR), temperature rise, magnetic induction, two-arm Archimedean spiral coil (TAASC), human head model

DOI: 10.3233/BME-151329

Journal: Bio-Medical Materials and Engineering, vol. 26, no. s1, pp. S405-S412, 2015

Published: 2015
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This study investigates the radiation safety of a newly designed magnetic induction sensor. This novel magnetic induction sensor uses a two-arm Archimedean spiral coil (TAASC) as the exciter. A human head model with a real anatomical structure was used to calculate the specific absorption rate (SAR) and temperature change. Computer Simulation Technology (CST) was used to determine the values of the peak 10-g SAR under different operating parameters (current, frequency, horizontal distance between the excitation coil and the receiver coil, vertical distance between the top of the head model and the XOY plane, position of excitation coil, and volume of hemorrhage). Then, the highest response for the SAR and temperature rise was determined. The results showed that this new magnetic induction sensor is safe in the initial state; for safety reasons, the TAASC current should not exceed 4 A. The scalp tissue absorbed most of the electromagnetic energy. The TAASC’s SAR/thermal performance was close to that of the circular coil.

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