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首页> 外文期刊>Physics in medicine and biology. >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
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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

机译：由于来自65 MHz和2 GHz之间的地平面的电磁场的反射，在人体素体模中计算出的SAR分布

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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.
机译：如果电磁场正常入射到完美导电的接地平面上，则该场会反射回磁畴。这会在地面上方产生驻波。如果在该区域内存在人员，则人体对磁场的吸收可能会导致遵守电磁准则的问题。为了对此进行研究，已针对地面条件下的各种暴露情况，计算了体素模型NORMAN中的全身平均比能量吸收率（SAR），局部SAR和踝电流。将结果归一化为空间平均场，该技术用于确定平均值，以便在场沿身体高度变化时与准则进行比较。此外，还计算了产生对全身平均SAR的基本限制所需的外部场值。发现在所研究的所有配置中，ICNIRP参考级别和IEEE MPE都提供了这些限制的保守估计。

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