基于发射束迭代算法的超声波色差抑制方法研究  

Study of Reduction Aberration of Ultrasound Image Based on Iteration of Transmit

作　　者：郑音飞[1] 邱飞岳[1] 李鹏[1] 胡大可[1] 陈裕泉[1] 

机构地区：[1]浙江大学生物医学工程系,生物传感器国家专业实验室,杭州310027

出　　处：《传感技术学报》2009年第2期240-243,共4页Chinese Journal of Sensors and Actuators

基　　金：中国博士后学科基金资助(20080431331)

摘　　要：医学超声成像中的色差通常是通过换能器阵列信号的到达时间和振幅波动来建模的,该方法是对物理色差过程的近似,并可通过使用延时和振幅滤波器来校正发射信号,但在严重色差出现时对这种滤波器的测定是非常困难的。因此,本文给出一种迭代的方法,该方法使用滤波器估算来校正发射声束,得到的声束引起声波的背向散射,这种背向散射声束更适合对信号到达的时间和振幅进行估算,从而使得对换能器的建模变得更加方便;实验仿真结果显示,与理想的色差校正滤波器相比,只需很少几个迭代即可得到校正的发射声束剖面图。Aberration in medical ultrasonic imaging is tions concentrated on the transducer array. This is usually modeled by arrival-time and amplitude fluctuaan approximation of the physical aberration process, and may be applied to correct the transmitted signal using a time-delay and amplitude filter. Estimation of such a filter has proven difficult in the presence of severe aberration. Presented here is an iterative approach,whereby a filter estimate is applied to correct the transmit-beam. This beam induces acoustic backscatter better suited for arrival-time and amplitude estimation, thus facilitating an improved filter estimate. Results show that only a few iterations are needed to obtain corrected transmit-beam profiles comparable to those of an ideal aberration correction filter.

关 键 词：非线性超声场 超声波色差 发射声束迭代 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]