超声热疗中媒质特性对声聚焦的影响  

Influence of Medium Properties on Sound Focusing During Ultrasonic Hyperthermia

作　　者：胡爱明[1] 钱盛友[1] 唐喜梅[1] 

机构地区：[1]湖南师范大学物理信息科学学院,湖南长沙410081

出　　处：《吉首大学学报（自然科学版）》2007年第2期75-77,共3页Journal of Jishou University(Natural Sciences Edition)

基　　金：湖南省自然科学基金资助项目(022059)

摘　　要：以凹球面自聚焦超声换能器为例,用瑞利积分进行数值模拟计算,研究声衰减、声速、温度等参数对声聚焦的影响,并对不同生物组织中声聚焦的特点进行了比较.研究表明,不同的媒质的特性参数聚焦表现出不同的特点.声衰减系数增大,则焦斑向声源靠近且焦斑缩短;声速越大,则焦距越小,但焦域最大声压值升高,焦斑的面积增大;温度变化不大时,对声聚焦的影响不明显.Influence of parameters such as attenuation coefficient, velocity of sound, and temperature of medium on focusing sound field generated by a self-focused concave spherical radiator has been studied through numerical simulation with Ray-leigh integral. The results show that characteristics of focal regions are different for various mediums. If the attenuation coefficient increases, the focus moves toward the sound source and the focal region shortens. If the velocity of sound increases, the focal distance will decrease and the pressure and the size of the focal region will increase. Influence of temperature on focusing effect is not obvious as the temperature changes a little.

关 键 词：高强度聚焦超声 声焦域 衰减系数 温度 

分 类 号：O426.9[理学—声学]