可变分数时延滤波器在超声成像系统中的应用

The application of variable fractional delay filter in ultrasound imaging system

为了提升超声成像系统的图像质量,将可变分数时延滤波器引入超声成像系统声束形成环节,首先介绍了一种在实践中便于实现,且节省存储资源的Farrow结构可变分数时延滤波器,通过仿真验证了该时延滤波器能够提高时延精度,有效弥补时延误差导致的图像尾影;其次在FPGA中实现了该滤波器功能,时序仿真结果说明FPGA实现结果与理论分析一致,可用于实际工程实践。

In order to improve the image quality ofultrasound imaging system,this paper introduces the variable fractional delay filter to beamforming of the ultrasound imaging system,first introduces a Farrow variable fractional delay filter which is easy to realize in practice and saves the storage resource,then verifies its improvement of precision and compensation for time delay error caused by image tail ghosting through simulation. Second realizes the function of this filter in the FPGA,the simulation result explains the consistency between FPGA realization and theoretical analysis and it＇s appropriate for engineering practice.