Calculated SAR distributions in a human voxel phantom due to the reflection of electromagnetic fields from a ground plane between 65 MHz and 2 GHz

被引:13
作者
Findlay, R. P. [1 ]
Dimbylow, P. J. [1 ]
机构
[1] Natl Radiol Protect Board, Didcot OX11 0RQ, Oxon, England
关键词
D O I
10.1088/0031-9155/53/9/005
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
If an electromagnetic field is incident normally onto a perfectly conducting ground plane, the field is reflected back into the domain. This produces a standing wave above the ground plane. If a person is present within the domain, absorption of the field in the body may cause problems regarding compliance with electromagnetic guidelines. To investigate this, the whole-body averaged specific energy absorption rate (SAR), localised SAR and ankle currents in the voxel model NORMAN have been calculated for a variety of these exposures under grounded conditions. The results were normalised to the spatially averaged field, a technique used to determine a mean value for comparison with guidelines when the field varies along the height of the body. Additionally, the external field values required to produce basic restrictions for whole-body averaged SAR have been calculated. It was found that in all configurations studied, the ICNIRP reference levels and IEEE MPEs provided a conservative estimate of these restrictions.
引用
收藏
页码:2277 / 2289
页数:13
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