超声成像仪动态滤波器设计

摘要

针对超声在人体中传播能量随深度增加而衰减的特点，为了提高图像分辨率，设计了一种应用于超声成像系统中动态滤波器电路。文中给出了滤波器的硬件设计电路图，通过电路测试证明该设计简单可行，对回波信号进行匹配滤波，得到最佳的信噪比，满足系统设计要求。%The dynamic filter circuit is designed to solve the problem that ultrasonic propagation will attenuate while entering the deeper body, thus to improve image resolution. The Filter circuit diagram of hardwares is also presented in this paper. The feasibility of this design is proved through circuit testing and filtering echo signals to get the best signal noise ration.