Variability analysis of SAR from 20 MHz to 2.4 GHz for different adult and child models using finite-difference time-domain
Variability analysis of SAR from 20 MHz to 2.4 GHz for different adult and child models using finite-difference time-domain
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DOI：
10.1088/0031-9155/53/6/001
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发表时间：
2008-03-21
影响因子：
3.5
通讯作者：
Wiart, J.
中科院分区：
文献类型：
--
作者：
Conil, E.;Hadjem, A.;Wiart, J.
本文讨论了在数值剂量学研究中使用的人体模型的可变性。收集了6个成人拟人化体素模型，并使用考虑解剖参数的变形方法构建了5、8和12岁的儿童。在20 MHz到2.4 GHz的频率范围内，对平面波照射下的孤立模型进行了比吸收率(SAR)的时域有限差分计算。给出了全身平均SAR以及皮肤、肌肉、脂肪或骨骼等特定组织的平均SAR和身体特定部位(如头、腿、手臂或躯干)的平均SAR。结果指出了成人模型的变异性。成人模型全身平均SAR的标准偏差可达40%。所有模体都暴露在ICNIRP参考水平下。结果表明，对于成年人来说，遵守参考水平确保了对基本限制的遵守，但对于本研究涉及的儿童模型，全身平均SAR超过了基本安全限值高达40%。
This paper deals with the variability of body models used in numerical dosimetry studies. Six adult anthropomorphic voxel models have been collected and used to build 5-, 8- and 12-year-old children using a morphing method respecting anatomical parameters. Finite-difference time-domain calculations of a specific absorption rate ( SAR) have been performed for a range of frequencies from 20 MHz to 2.4 GHz for isolated models illuminated by plane waves. A whole-body-averaged SAR is presented as well as the average on specific tissues such as skin, muscles, fat or bones and the average on specific parts of the body such as head, legs, arms or torso. Results point out the variability of adult models. The standard deviation of whole-body-averaged SAR of adult models can reach 40%. All phantoms are exposed to the ICNIRP reference levels. Results show that for adults, compliance with reference levels ensures compliance with basic restrictions, but concerning children models involved in this study, the whole-body-averaged SAR goes over the fundamental safety limits up to 40%.