title: Effects of frequency, irradiation geometry and polarisation on computation of SAR in human brain.
abstract: The power absorbed by the human brain has possible implications in the study of the central nervous system-related biological effects of electromagnetic fields. In order to determine the specific absorption rate (SAR) of radio frequency (RF) waves in the human brain, and to investigate the effects of geometry and polarisation on SAR value, the finite-difference time-domain method was applied for the SAR computation. An anatomically realistic model scaled to a height of 1.70 m and a mass of 63 kg was selected, which included 14 million voxels segmented into 39 tissue types. The results suggested that high SAR values were found in the brain, i.e. ∼250 MHz for vertical polarisation and 900-1200 MHz both for vertical and horizontal polarisation, which may be the result of head resonance at these frequencies.
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Zhentao
authors.initials: Z
authors.lastname: Su
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Ning
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Changzhen
authors.initials: C
authors.lastname: Wang
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Xie
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Decheng
authors.initials: D
authors.lastname: Qu
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Wu
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Xiaomin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Pan
authors.affiliation: Beijing institute of radiation medicine, Beijing 100850, China yanggs@nic.bmi.ac.cn.
authors.forename: Guoshan
authors.initials: G
authors.lastname: Yang
mesh_terms: D001921:Brain / Q000033:anatomy & histology / Q000528:radiation effects*; D003198:Computer Simulation; D004574:Electromagnetic Fields / Q000009:adverse effects; D006801:Humans; D008953:Models, Anatomic; D008959:Models, Neurological; D011829:Radiation Dosage; D011846:Radio Waves / Q000009:adverse effects*; D014916:Whole-Body Irradiation / Q000009:adverse effects