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

A study of re-entrant type cavity applicator hyperthermia system for deep seated tumor

深部肿瘤凹入式腔体热疗系统的研究

基本信息

批准号：
04557048
负责人：
SAITOH Yoshiaki
金额：
$ 10.43万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

A study is reported of a hyperthermia system having effective heating characteristics for deep seated tumor. This system has a unique applicator consisting of a re-entrant cavity resonator.1. Computer simulation with FD-TD method was carried out to estimate energy distribution of the re-entrant cavity applicator. We estimate from the results of this simulation the heating characteristics vary with electric constants of heated materials.2. For optimum design computation change of the size of diameter, hight of resonator and re-entrant does not affect the energy distribution.3. On the basis of the simulation data we designed and composed a re-entrant cavity applicator and examined experimentaly the heating characteristics.4. We also designed a wide band high power generator which available for frequency change of various shapes and sizes of the heated materials.5. Improvement of matching section with pulse motor driven capacitors and computer control system of a phantom temperature was performed.6. To obtain concentrated heated pattern, experiment of changing the diameter of re-entrant was done. An electric concentration apparatus was very effective for concent rated heating.7. Measurements of heated pattern varing electric constants of phantoms revealed that the electric constants of the muscle is critical point for concentrated heating in this system. Further development is necessary concering electric constants for clinical use.

本文报道了一种对深部肿瘤具有有效加热特性的热疗系统。该系统有一个独特的加药器，由一个可再入腔谐振器组成。利用FD-TD方法进行计算机模拟，估算了再入腔器的能量分布。根据模拟的结果，我们估计加热特性随被加热材料的电常数而变化。在优化设计计算中，直径大小、谐振腔高度和重入腔的变化对能量分布没有影响。在模拟数据的基础上，我们设计并制作了一个可再入腔的加热器，并对其加热特性进行了实验研究。我们还设计了一种宽带大功率发生器，可用于各种形状和尺寸的加热材料的频率变化。采用脉冲电机驱动电容对匹配部分进行了改进，并对虚温计算机控制系统进行了改进。为了获得集中的加热模式，进行了改变返回式孔径的实验。电浓缩装置对浓缩加热是非常有效的。对热模的电常数变化的测量表明，肌肉的电常数是该系统集中加热的临界点。临床应用的电常数还需要进一步发展。