基于FPGA的眼科超声数字化成像中内插变频技术与实现  

Design and Implementation of Interpolation Filter in Ophthalmology Ultrasonography Digital Image Based on FPGA

作　　者：程春卯[1] 计建军[1] 王延群[1] 杨军[1] 周盛[1] 王晓春[1] 宋学东[1] 王效宁[1] 

机构地区：[1]中国医学科学院北京协和医学院生物医学工程研究所,天津300192

出　　处：《中国生物医学工程学报》2009年第3期398-402,414,共6页Chinese Journal of Biomedical Engineering

基　　金：天津市科技支撑计划项目(06YFSYSF00300);科技部设备升级改造项目(2006SJ105200);中央级公益性研究院所基本科研业务专项

摘　　要：眼科高频超声数字化成像中使用内插滤波器可等效地提高采样率以节约资源。在研究分析了有限脉冲响应(FIR)内插滤波器的两种常见结构以及半带滤波器、级联积分梳状(CIC)滤波器两种特殊结构等四种内插滤波器的基础上,设计了四种高效结构。通过Verilog硬件描述语言描述以上四种高效结构,并在现场可编程门阵列(FPGA)中实现,最后通过实验仿真验证各内插变频算法的有效性。以有限脉冲响应(FIR)内插滤波器的两种常见结构以及半带滤波器为基础改进的高效结构均能达到变频的效果,同时可节约资源且效率更高。而CIC滤波器高效结构在效率和资源节约方面虽更具优势,但未能达到眼科超声变频信号处理所要求的性能,尚不适用。The aim of this study is to design interpolation filters for the enhancement of sampling frequency in the ophthalmology ultrasonography digital image system. Four effective structures, including two common structures of finite impulse response （FIR） filters, half-band filter and cascaded integrator comb （CIC） filter, were designed as interpolation filters. These structures were implemented in field programmable gate array （FPGA） using Verilog hardware description language. The algorithm of each structure was validated by simulation. The results showed that except for CIC, the rest three structures met the demand. Though having the advantage in saving more resources, the CIC structure needs further improvement before its application.

关 键 词：内插滤波器 眼科超声 高效结构 现场可编程门阵列(FPGA) 

分 类 号：R318[医药卫生—生物医学工程]