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首页> 外文期刊>Radiation Protection Dosimetry >RADIO FREQUENCY-INDUCED TEMPERATURE ELEVATIONS IN THE HUMAN HEAD CONSIDERING SMALL ANATOMICAL STRUCTURES
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RADIO FREQUENCY-INDUCED TEMPERATURE ELEVATIONS IN THE HUMAN HEAD CONSIDERING SMALL ANATOMICAL STRUCTURES

机译：考虑小解剖结构的人头中的无线电频率诱发的温度变化

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摘要

In order to enable a detailed numerical radio frequency (RF) dosimetry and the computations of RF-induced temperature elevations, high-resolution (0.1 mm) numerical models of the human eye, the inner ear organs and the pineal gland were developed and inserted into a commercially available head model. As radiation sources, generic models of handsets at 400, 900 and 1850 MHz operating in close proximity to the head were considered. The results, obtained by finite-difference time domain-based computations, showed a highly heterogeneous specific absorption rate (SAR) distribution and SAR-peaks inside the inner ear structures; however, the corresponding RF-induced temperature elevations were well below 0.1℃, when considering typical output power values of handheld devices. In case of frontal exposure, with the radiation sources ～2.5 cm in front of the closed eye, maximum temperature elevations in the eye in the range of ～0.2-0.6℃ were found for typical device output powers. A reduction in tissue perfusion mainly affected the maximum RF-induced temperature elevation of tissues deep inside the head. Similarly, worst-case considerations regarding pulsed irradiation affected temperature elevations in deep tissue significantly more than in superficial tissues.
机译：为了实现详细的数字射频（RF）剂量学和RF引起的温度升高的计算，开发了人眼，内耳器官和松果体的高分辨率（0.1 mm）数值模型，并将其插入市售的头部模型。作为辐射源，考虑了在头部附近工作的400、900和1850 MHz手机的通用模型。通过基于时域有限差分的计算获得的结果表明，内耳结构内部的比吸收率（SAR）分布和SAR峰高度不均一。但是，考虑到手持设备的典型输出功率值，相应的RF引起的温度升高远低于0.1℃。在正面暴露的情况下，在闭眼前约2.5 cm的辐射源处，典型设备输出功率的最高温度升高范围为〜0.2-0.6℃。组织灌注的减少主要影响了头部深部组织的最大射频诱导温度升高。同样，关于脉冲辐射的最坏情况考虑比深层组织对深部组织温度升高的影响更大。

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