HIFU治疗中媒质特性对声聚焦影响的研究  

Influence of Medium Properties on Sound Focusing During HIFU Therapy

作　　者：胡爱明[1] 钱盛友[1] 杨林[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：《中国医学物理学杂志》2008年第1期496-499,505,共5页Chinese Journal of Medical Physics

基　　金：湖南省自然科学基金资助项目(No.022059);湖南省教育厅资助科研项目(No.06c517)

摘　　要：目的:研究声衰减系数、声速、温度等媒质参数对声聚焦的影响。方法:用瑞利积分对凹球面自聚焦超声换能器进行声场模拟。结果及结论:媒质的特性参数不同,聚焦表现不同的特点。声衰减系数增大,焦斑向声源靠近,且焦斑缩短;声速越大,焦距越小,但焦区最大声压升高,焦斑的面积增大;温度变化不大时对声聚焦的影响不明显。Objective： Study the influence of parameters such as attenuation coefficient, velocity of sound, and temperature of medium on focusing sound field.Methods： Study the sound field generated by a self-focused concave spherical radiator through numerical simulation with Ray-leigh integral.Results and Conclusions： Characteristics of focal regions are different for various medium. 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：O422.2[理学—声学] R318[理学—物理]