Appropriate modeling of the ear for compliance testing of handheld MTE with SAR safety limits at 900/1800 MHz
Appropriate modeling of the ear for compliance testing of handheld MTE with SAR safety limits at 900/1800 MHz
复制标题
适当的耳朵建模，用于手持式 MTE 与 900/1800 MHz SAR 安全限制的合规性测试
DOI：
10.1109/22.883873
复制
发表时间：
2000
影响因子：
4.3
通讯作者：
N. Kuster
中科院分区：
文献类型：
--
作者：
M. Burkhardt;N. Kuster
各种模拟人体头部的模型已被用来测试移动电信设备是否符合安全标准。虽然数值顺从性程序大多使用基于磁共振成像（MRI）数据的复杂解剖模型来执行，但实验程序主要依赖于均质模型，其耳朵通常被建模为无损垫片。先前的研究确实表明，除外耳之外的头部组织的吸收可以通过具有适当形状和材料的均质头部来很好地代表。本文的目的是填补剩余悬而未决问题的空白，即：根据空间峰值比吸收率评估耳朵区域的暴露，并评估用于实验评估的最合适的耳朵模型，使其代表手机用户合理横截面的最大暴露。本文基于使用高分辨率 MRI 扫描生成的详细数字模型。在扫描过程中，耳朵自然塌陷，就像使用手机时一样。这项研究的结果得出这样的结论：内耳和外耳中发生的空间峰值吸收可以通过不厚于 3-4 毫米的无损垫片或通过用头部组织模拟介质部分填充模拟耳廓来可靠地建模，而设备和液体之间的最小距离不应大于 3 毫米。
A variety of phantoms simulating the human head have been used to test compliance of mobile telecommunications equipment with safely standards. Whereas numerical compliance procedures have mostly been performed using complex anatomical phantoms based on magnetic resonance imaging (MRI) data, experimental procedures have mainly relied on homogeneous phantoms, the ears of which have often been modeled as lossless spacers. Previous studies had indeed demonstrated that the absorption in the head tissue, except the outer ear, can be well represented by a homogeneous head of appropriate shape and material. The objectives of this paper were to fill the gap of the remaining open issues, namely: to evaluate the exposure in the ear region with respect to the spatial-peak specific absorption rate and to evaluate the most appropriate modeling of the ear for experimental evaluations such that it represents the maximum exposure of a reasonable cross section of cellular phone users. This paper is based on a detailed numerical phantom produced using high-resolution MRI scans. During scanning, the ear was naturally collapsed as it occurs when using a cellular phone. The results of this study lead to the conclusion that the spatial-peak absorption occurring in the inner and outer ear can be reliably modeled either by a lossless spacer of not thicker than 3-4 mm or by partially filling the simulated pinna with head tissue simulating media, whereas the minimum distance between the device and liquid should not be larger than 3 mm.