超声阵列换能器设计及声场模拟  

Design of ultrasound phased array in focused ultrasound and the simulation of its acoustic field

作　　者：霍彦明[1] 李国伟[1] 陈亚珠[1] 

机构地区：[1]上海交通大学生物医学仪器研究所,上海200030

出　　处：《声学技术》1999年第4期168-172,共5页Technical Acoustics

摘　　要：聚焦超声采用的聚焦方式有许多种，电子聚焦是其中之一，与其它聚焦方式相比，电子聚焦技术有很多优点，然而一些相互矛盾的条件对其设计有很大影响。通过用快速算法对阵元声场、以及频率对声场的影响进行模拟，对阵列设计中的几个主要考虑方面进行了分析，提供了一般设计思路。采用伪逆矩阵算法，对变迹技术和多焦点技术进行计算机模拟，为焦域控制提供了新的思路，结果表明：将电子聚焦阵列换能器用于高强度聚焦超声治疗设备，比其它聚焦方式有更多的优越性，但实际设计中也存在一些相互矛盾的条件，设计中需要设计者仔细权衡利弊，做出合理设计方案。There are many kinds of focusing methods Electrical focusing is one of them. Comparing with other kinds of focusing, electrical focusing has a lot of merits. But there are some contradiction conditions in its design. A fast algorithm is uesed to simulate the acoustic field of array unit and the influence of frequency to acoustical field. By analysing problems generated in phased array design, the basic design method is provided. Inverse matrix algorithm, is used to simulate the aptitude apodization and multiple focus technique. It provides a new method to control intensity and position of focus. The results express that ultrasound phased array has many merits than other kinds of focusing. But there are some contradiction conditiions in its design. In order to draw a proper schema, it needs the designer to choose a compromise method in all kinds of contradict conditions. There are many kinds of focusing methods Electrical focusing is one of them. Comparing with other kinds of focusing, electrical focusing has a lot of merits. But there are some contradiction conditions in its design. A fast algorithm is uesed to simulate the acoustic field of array unit and the influence of frequency to acoustical field. By analysing problems generated in phased array design, the basic design method is provided. Inverse matrix algorithm, is used to simulate the aptitude apodization and multiple focus technique. It provides a new method to control intensity and position of focus. The results express that ultrasound phased array has many merits than other kinds of focusing. But there are some contradiction conditiions in its design. In order to draw a proper schema, it needs the designer to choose a compromise method in all kinds of contradict conditions.

关 键 词：聚焦超声 相控阵列 声场模拟 超声换能器 

分 类 号：TB552[理学—物理]