摘要
偶极子辐射天线在生物介质中近场辐射及温度特性对腔道微波热疗有重要实用意义。本文在腔内水冷式微波偶极子辐射器近场辐射模型和比吸收率计算工作基础上［１］，求解相应的生物介质热传导方程，得到了水冷式腔道辐射器在生物介质中的温度分布。计算表明，水冷可改善热区温度分布，主要使径向最高温度点由无水冷时贴近辐射器壁向组织深部迁移（本文示例达６ｍｍ以远）；径向治疗深度比无水冷时向组织内部延伸；相应的治疗体积则比无水冷时增加（约３９％）。若采取先用小功率、无水冷加热，后用大功率、有循环水冷的二步加热程序，则总有效治疗体积可比完全无水冷时扩大１．２４倍。本文计算结果与相应的等效肌肉体模实验及热疗临床经验相符，为腔道水冷式微波辐射器的研制设计和临床应用提供了参考依据。
An insulated, water cooled dipole radiating in a biological tissue was analyzed with a theoretical electro magnetic model. The temperature distribution was calculated, taking intoaccount the effect of the water flowing inside the applicator, and result compared with that of no water cooled radiating dipole. The numerical results calculated were comformed with those of equivalent muscle phantom experiment. It was shown that, the temperature distribution would be improved with the increase of therapy depth due to the effect of water cooling. The water cooling effect would make the maximum temperature point moving from close to the wall of the applicator (under condition of no water cooling) to the deeper layer (over 6mm as shown in the text), and the radiating therapy depth extended to a depth 3￣4mm deeper than that without water cooling, thus the coresponding therapeutic volume being increased by 39% over that without water cooled. If the heating program was applied according to following so called two step heating schedule: first small power heating without water cooling, and then larger power heating with water cooling, the total effective therapeutic volume would be increased by 1.24 times of that without water cooling.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
1997年第3期237-243,252,共8页
Chinese Journal of Biomedical Engineering
基金
国家自然科学基金
天津市自然科学基金
天津市二十一世纪青年科学基金
关键词
辐射偶极子
温度分布
肿瘤
微波辐射器
Radiating dipole
Hyperthermia
Thermal conductivity
Temperature distribution
