title: SAR and thermal response effects of a two-arm Archimedean spiral coil in a magnetic induction sensor on a human head.
abstract: 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.
authors.affiliation: College of Science, National University of Defense Technology, Changsha, Hunan 410073, China.|State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics & Information System, National University of Defense Technology, Changsha, Hunan 410073, China.
authors.forename: Ziyi
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics & Information System, National University of Defense Technology, Changsha, Hunan 410073, China.
authors.forename: Peiguo
authors.initials: P
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics & Information System, National University of Defense Technology, Changsha, Hunan 410073, China.
authors.forename: Dongming
authors.initials: D
authors.lastname: Zhou
authors.affiliation: College of Science, National University of Defense Technology, Changsha, Hunan 410073, China.|State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics & Information System, National University of Defense Technology, Changsha, Hunan 410073, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronics & Information System, National University of Defense Technology, Changsha, Hunan 410073, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Ding
mesh_terms: D065638:Absorption, Radiation / Q000502:physiology*; D001921:Brain / Q000502:physiology* / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D006257:Head / Q000502:physiology* / Q000528:radiation effects; D006801:Humans; D060526:Magnetic Fields; D010992:Plethysmography, Impedance / Q000295:instrumentation* / Q000379:methods; D011829:Radiation Dosage; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers
keywords: Specific absorption rate (SAR); human head model; magnetic induction; temperature rise; two-arm Archimedean spiral coil (TAASC)