超声编码激励产生声辐射力的数值模拟  

Numerical simulation on acoustic radiation force induced by ultrasonic coded excitation

作　　者：陈思平[1] 曾斯宁[1] 汪天富[1] 覃正笛[1] 

机构地区：[1]深圳大学医学院深圳市生物医学工程重点实验室,深圳518060

出　　处：《深圳大学学报（理工版）》2011年第2期165-171,共7页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(60871060);深圳市科技计划基础研究重点项目(JC200903120129A)~~

摘　　要：基于编码扩谱原理,在超声弹性成像技术中,提出用编码激励产生声辐射力的方法,分析其原理并建立了概率统计模型,研究编码激励在各向同性均匀介质中产生的超声剪切波的分布特性.数值仿真结果表明,用编码脉冲激励产生声辐射力的方法可提高系统的时间和频宽利用率,同时结合脉冲超声检测编码调制技术的支持,可减少对激励信号占空比的局限,提高声辐射的穿透力和回波信噪比.A coded excitation method in ultrasonic elastography,based on the spread spectrum technology,was proposed.A statistical model for the shear wave distribution in the ultrasound field was set up.The theoretical analysis as well as the computer simulation shows that using a coded excitation for the system resources it is more efficient than using a pulsed excitation.Combining the detection technology with coded pulses using different codes for sharewave excitation and the detection,a lower cross-correlation can be achieved so that both the duty cycle of the excitation and the signal-to-noise ratio of the detection can be improved for the whole system.

关 键 词：生物医学仪器 生物物理学 脉冲编码调制 声辐射力 分布函数 占空比 超声弹性成像 

分 类 号：R318.6[医药卫生—生物医学工程] Q681[医药卫生—基础医学]