权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Establishment of the method for quantitative measurement of SAR value using a high molecular gel phantom

高分子凝胶体模定量测量SAR值方法的建立

基本信息

批准号：
09450169
负责人：
MIYAKAWA Michio
金额：
$ 7.49万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450169/
关键词：
Phantom model High molecular gel Absorbed power Electromagnetic wave SAR 3D measurement Visualization 電磁環境

项目摘要

A new technique for visualization or three dimensional measurement of power absorbed by the human body has been developed by using a high molecular gel phantom whose cloudiness varies with the change in temperature. The gel phantom contains non ionic surface active agent in addition to salt, sugar and alcohol. The electric-, optical-, and mechanical-property of the phantom are adjusted to the desired values by varying those concentration. The region which exceeds a specific temperature called clouding point by absorbing electromagnetic power becomes white and opaque due to segregation of non ionic surface active agent. Therefore, the absorbed power can be visualized by using the gel phantom.A series of standard phantoms have been given at some typical frequencies which are commonly used for various purposes. That is, relationships between the phantom composition and physical property such as electric-, mechanical- and thermal properties have been given, Based on this knowledge, various kinds of phantoms can be developed.The SAR value represents average power density absorbed by a small region on the boundary between the clouded- and nonclouded-region of the phantom as long as thermal conduction of the phantom is negligible. Furthermore, the coordinates of the small region on the boundary can be measured with a laser range finder. Thus, it is concluded that local SAR is made visible or measurable in three dimensional ways. The validity of the method of SAR measurement has been shown by FD-TD based numerical analysis.

本文提出了一种利用云量随温度变化而变化的高分子凝胶模体对人体吸收的能量进行可视化或三维测量的新技术。凝胶幻影除含有盐、糖和酒精外，还含有非离子表面活性剂。通过改变这些浓度，可以将光体的电学、光学和机械性能调整到所需的值。由于非离子表面活性剂的偏析，吸收电磁功率超过特定温度的区域变得白色和不透明。因此，吸收功率可以通过凝胶模体可视化。在一些通常用于各种目的的典型频率上给出了一系列标准幻像。也就是说，给出了幻相成分与物理性能（如电性能、机械性能和热性能）之间的关系，在此基础上，可以开发各种各样的幻相。SAR值表示在模体的热传导可以忽略的情况下，在模体的云区和非云区之间的边界上的一个小区域吸收的平均功率密度。此外，边界上小区域的坐标可以用激光测距仪测量。因此，可以得出结论，局部SAR可以以三维方式可见或测量。基于FD-TD的数值分析验证了SAR测量方法的有效性。