FDTD-derived correlation of maximum temperature increase and peak SAR in child and adult head models due to dipole antenna
FDTD-derived correlation of maximum temperature increase and peak SAR in child and adult head models due to dipole antenna
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DOI：
10.1109/temc.2006.870816
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发表时间：
2006-04
影响因子：
2.1
通讯作者：
M. Fujimoto;A. Hirata;Jianqing Wang;O. Fujiwara;T. Shiozawa
中科院分区：
文献类型：
--
作者：
M. Fujimoto;A. Hirata;Jianqing Wang;O. Fujiwara;T. Shiozawa
本文研究了偶极子天线在成人和儿童头部模型中的峰值比吸收率（SAR）与最大温升之间的相关性。由于儿童组织的电常数和热常数与成人组织的不同，因此，儿童模型的电常数和热常数的变化对相关性的影响受到了很大的关注。为了彻底调查这些相关性，共1400情况下，考虑以下六个模型：3岁的儿童，7岁的儿童，成人模型开发的名古屋工业大学和大坂大学。在统计的基础上对数值结果进行了分析。我们发现，在头部的最大温度增加可以线性估计的峰值SAR平均超过1或10克的组织。特别是，在成人和儿童模型之间没有观察到明显的差异，在斜率相关的最大温升与峰值SAR。此外，组织的电常数和热常数对这些相关性的影响被发现是边缘的。此外，我们还讨论了安全指南中规定的SAR限值的头部和大脑可能的最大温度升高。对于大坂大学开发的成人模型，发现对于1-g立方组织，在SAR值为1.6 W/kg时，温度分别为0.26 ℃和0.10 ℃，对于10-g立方组织，在SAR值为2.0 W/kg时，温度分别为0.59 ℃和0.21 ℃。同样，对于大坂大学的3岁儿童模型，对于1-g SAR的值，它们分别为0.23 ℃和0.11 ℃，对于10-g SAR的值，它们分别为0.53 ℃和0.20 ℃
This paper investigates the correlation between the peak specific absorption rate (SAR) and the maximum temperature increase in head models of adults and children due to a dipole antenna. Much attention is paid to the effect of variation of electrical and thermal constants on the correlation for the child models, since these constants of child tissues are different from those of adult tissues. For investigating these correlations thoroughly, a total of 1400 situations are considered for the following six models: 3-year-old child, 7-year-old child, and adult models developed at the Nagoya Institute of Technology and the Osaka the University. The numerical results are analyzed on the basis of statistics. We find that the maximum temperature increases in the head can be estimated linearly in terms of peak SAR averaged over 1- or 10-g of tissue. In particular, no clear difference is observed between the adult and child models in terms of the slopes correlating the maximum temperature increase with the peak SAR. Also, the effect of electrical and thermal constants of tissue on these correlation is found to be marginal. Further, we discuss possible maximum temperature increases in the head and brain for SAR limits prescribed in safety guidelines. For the adult model developed at the Osaka Univ., these are found to be 0.26degC and 0.10degC at the SAR value of 1.6 W/kg for 1-g cubic tissue and 0.59degC and 0.21degC at the SAR value of 2.0 W/kg for 10-g cubic tissue. Similarly, for the 3-year-old child model at Osaka Univ., these are 0.23degC and 0.11degC for the value of 1-g SAR and 0.53degC and 0.20degC for the value of 10-g SAR