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Solid Materials Visualizing the Electromagnetic Energy Absorption Pattern Using a Cloud Point of Nonionic Surface Active Agent

使用非离子表面活性剂的浊点观察固体材料的电磁能量吸收模式

基本信息

批准号：
03650344
负责人：
YAMAURA Itsuo
金额：
$ 1.54万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

1. At first, the measurement system of a cloud point and optical attenuation vs. temperature of the visualizing materials were constructed, which consisted of a He-Ne laser, an optical power meter, a digital thermometer, and a personal computer. The dynamic range of the optical attenuation measurement was 45 dB with the laser power of 2 mW.2. Agar gel is the most popular material in the phantoms absorbing electromagnetic energy. Optical transparency of the bare gel was measured. The characteristics of the transparency increased remarkably at the concentration of the agar below 2 %, though the mechanical strength of the gel was decreased. For further improvement of the transparency, glycerol was added to the material, and good results in optical attenuation were obtained when the surface active agent was absent in the gel.3. Electrical properties of the phantom have to be the same as those of biological tissues in the experiments such hyperthermia. Electrical conductivity of the material could be varied by adjusting the salt concentration. There were no changes in the optical and mechanical characteristics due to adding the salt within the concentration of 1 % except decrease of the cloud point.4. The optical attenuation measurement manifested that the hydrogels such as polyacrilamide, kappa-carrageenan, and gellan gum gels had better transparency than that of the agar gel. The mechanical strength became strong in the last two materials by adding the ionic substances, because they formed a structure of egg-box-junction interacting with the base material. This effect was not occurred in the former materials. The transparency of the gellan gum became lower by adding the ionic substances. From these results, it was concluded in the present study that kappa-carrageenan was the most excellent material for building the solid visualization phantom.

1.首先构建了可视化材料的浊点和光衰减随温度的测量系统，该系统由氦氖激光器、光功率计、数字温度计和个人计算机组成。激光功率为2 mW时，光衰减测量的动态范围为45 dB。2。琼脂凝胶是体模中最受欢迎的吸收电磁能的材料。测量裸露凝胶的光学透明度。当琼脂浓度低于2%时，尽管凝胶的机械强度下降，但透明度特性显着增加。为了进一步提高材料的透明度，在材料中添加甘油，当凝胶中不存在表面活性剂时，获得了良好的光衰减效果。 3．在热疗等实验中，体模的电特性必须与生物组织的电特性相同。通过调节盐浓度可以改变材料的电导率。添加1%浓度的盐，除了浊点降低外，光学和机械特性没有变化。 4．光衰减测量表明，聚丙烯酰胺、κ-卡拉胶、结冷胶等水凝胶比琼脂凝胶具有更好的透明度。通过添加离子物质，后两种材料的机械强度变强，因为它们形成了与基材相互作用的蛋盒连接结构。这种效果在以前的材料中没有发生。通过添加离子物质，结冷胶的透明度变低。根据这些结果，本研究得出的结论是，κ-卡拉胶是构建实体可视化模型的最优秀材料。