Analysis of RF exposure in the head tissues of children and adults
Analysis of RF exposure in the head tissues of children and adults
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DOI：
10.1088/0031-9155/53/13/019
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发表时间：
2008-07-07
影响因子：
3.5
通讯作者：
Bloch, I.
中科院分区：
文献类型：
--
作者：
Wiart, J.;Hadjem, A.;Bloch, I.
本文分析了使用蜂窝手机或射频源（偶极子和通用手机）在900，1800，2100和2400 MHz的儿童头部组织中的射频（RF）暴露。基于磁共振成像，已经开发了儿童头部模型。在7个儿童和6个成人异质头部模型中分析了头部超过10 g的最大比吸收率（SAR）。使用基于变形技术的模型来进行相同年龄组中的可变性的影响。还在不同类型的儿童和成人头部模型中评估了特定组织中超过1 g的SAR。进行了比较，但仍需加以确认，因为它们是从规模有限的数据集得出的。已经进行的模拟表明，成人和儿童头部模型中估计的超过10 g的最大SAR之间的差异与标准差相比很小。但他们指出，年龄在5至8岁之间的儿童模型的1 g外周脑组织中的最大SAR比成人模型高约两倍。对于8岁以上儿童的儿童模型，未观察到这种差异：1 g外周脑组织中的最大SAR与成人模型中的最大SAR大致相同。这种差异可以通过较小的儿童模型的耳廓、皮肤和头骨的较薄厚度来解释。
This paper analyzes the radio frequencies (RF) exposure in the head tissues of children using a cellular handset or RF sources (a dipole and a generic handset) at 900, 1800, 2100 and 2400 MHz. Based on magnetic resonance imaging, child head models have been developed. The maximum specific absorption rate (SAR) over 10 g in the head has been analyzed in seven child and six adult heterogeneous head models. The influence of the variability in the same age class is carried out using models based on a morphing technique. The SAR over 1 g in specific tissues has also been assessed in the different types of child and adult head models. Comparisons are performed but nevertheless need to be confirmed since they have been derived from data sets of limited size. The simulations that have been performed show that the differences between the maximum SAR over 10 g estimated in the head models of the adults and the ones of the children are small compared to the standard deviations. But they indicate that the maximum SAR in 1 g of peripheral brain tissues of the child models aged between 5 and 8 years is about two times higher than in adult models. This difference is not observed for the child models of children above 8 years old: the maximum SAR in 1 g of peripheral brain tissues is about the same as the one in adult models. Such differences can be explained by the lower thicknesses of pinna, skin and skull of the younger child models.