Development of human-body phantoms for evaluation of interaction between the human body and electromagnetic waves

从人体附近使用的移动通信设备的设计和开发的角度出发，对评估人体对天线特性的影响提出了很高的要求。另一方面，也要求对这些设备辐射的电磁波对人体的影响进行定量评估。然而，用真实的人体进行实验评估是不可能的。因此，不仅要制作数值人体模型，而且要制作实验人体模型，并开发利用该模型的评价系统。在这样的背景下，我们开展了微波人体体模的研制工作。1998年，我们研制了生物组织等效微波固体体模，并提出了基于热像法的人体体模与微波相互作用的评价系统。此外，利用研制的体模和系统对人体内的合成孔径雷达进行了评价。我们还研制了人头真人模型体模。1999年，为提高保存性，研制了以甘油为主要成分的微波生物组织等效模。针对警用、消防、广播等领域的移动通信设备，在150 MHz频段对人体与天线的相互作用进行了评价，从而建立了简易的人体与电磁波相互作用的评价体系。我们还可以开发出保存性能良好的微波生物组织等效体模。我们希望我们的结果用于评估移动通信设备辐射的电磁波对人体的影响。作为进一步的研究，我们的目标是提高我们的评估系统的精度，并改进我们的模型。

Evaluation of the effects of the human body on antenna characteristics has highly been demanded from the viewpoint of the design and development of mobile communication devices used near the body. On the other hand, the quantitative evaluation of the effects of the electromagnetic waves radiated from these devices on the human body has also been demanded. It is impossible, however, to conduct the experimental evaluation using the real human body. Therefore, we must produce not only the numerical human-body model but also the experimental one and develop the evaluation system using the model. Under such backgrounds, we have performed the research on the development of the human-body phantom for microwave.In 1998, we developed the biological tissue-equivalent solid phantoms for microwave and proposed the evaluation system of interaction between the phantom and microwave on the basis of thermographic method. Moreover, we evaluated the SAR inside the human body by using the developed phantom and system. We also developed the human-head real-model phantom. In 1999, the biological tissue-equivalent phantoms for microwave mainly composed of glycerin were developed to improve the preservation. Moreover, we evaluated the interaction between the human body and the antenna at 150 MHz corresponding to the mobile communication devices used in the fields of police, fire fighting and broadcast.Consequently, we could establish the simple evaluation system of interaction between the human body and the electromagnetic waves. We could also develop the biological tissue-equivalent phantom for microwave with high preservation. We would like to expect that our results is used for evaluation of the effects of the electromagnetic waves radiated from mobile communication devices on the human body. As a further study, we are aiming at the high precision of our evaluation system and the improvement of our phantoms.