基于可编程计算架构的诊断超声信号处理系统设计

摘要

诊断超声信号处理系统的可编程与可重构性对于超声成像技术研究有着极其重要的意义.给出一种基于可编程计算架构的诊断超声成像系统的结构组成与实现方法.系统具有48路并行发射通道与回波信号接收通道,可实现128阵元线阵或48阵元相控阵换能器的激励信号的产生、回波信号调理与50 MHz、12 bit同步采集与接收.数字化回波数据在Virtex6 FPGA内经解串、波束合成、正交解调后送入TMS320C64x+ DSP进行组织图像重建.在系统软件控制下,DSP通过控制FPGA内的信号处理代码可实现系统功能的重构,以满足新一代成像算法开发与验证需求.%The availability of programmable and reconfigurable signal processing system has a considerable impact on the research of medical ultrasound imaging technology.Thus, a medical ultrasound signal processing system structures based on programmable computing architecture and its implementation is presented.This system consists 48 parallel transmitting and 48 parallel receiving channels which are capable of transmitting high power pulses, conditioning echoes and 12 bit sampling at a 50 MHz rate.Subsequently, the digitized signal samples are de-serialized, beam formed and demodulated by using a virtex6 FPGA and then they are sent to TMS320C64x + DSP to reconstruct the tissue images.Under the control of the system software, DSP is able toreconfigure the system function by controlling the signal processing codes in FPGA.This provides a flexible platform for supporting the development of new algorithms and emerging new ultrasound imaging applications.