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面向医学内窥诊断的数字超声多普勒成像系统
引用本文:李伟锋,刘亚莲,陈晓冬,李明,郁道银.面向医学内窥诊断的数字超声多普勒成像系统[J].纳米技术与精密工程,2010,8(5):411-415.
作者姓名:李伟锋  刘亚莲  陈晓冬  李明  郁道银
作者单位:天津大学精密仪器与光电子工程学院,天津,300072;光电信息科学技术教育部重点实验室,天津,300072
基金项目:国家自然科学基金仪器专项,国家高技术研究发展计划(863计划)资助项目 
摘    要:研究基于现场可编程门阵列(FPGA)的超声多普勒内窥成像系统,针对内窥系统超声探头体积小、回波信号微弱的特点,设计了具有较高增益和较低噪声的超声信号前端接收电路.在FPGA中对微弱信号进行全数字化处理,实现了正交解调与频谱分析等功能,系统具有电路匹配性好、信噪比高、处理速度快及体积小等优势;搭建基于多普勒物理模型的实验平台进行实验验证,分析对比不同实验条件下的声谱,验证了系统及信号处理方法的合理性和正确性.

关 键 词:超声内窥镜  微弱信号  脉冲多普勒  正交解调  频谱分析

Digital Doppler Ultrasonic Imaging System for Medical Endoscopic Diagnosis
LI Wei-feng,LIU Ya-lian,CHEN Xiao-dong,LI Ming,YU Dao-yin.Digital Doppler Ultrasonic Imaging System for Medical Endoscopic Diagnosis[J].Nanotechnology and Precision Engineering,2010,8(5):411-415.
Authors:LI Wei-feng  LIU Ya-lian  CHEN Xiao-dong  LI Ming  YU Dao-yin
Affiliation:1.School of Precision Instrument and Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China;2.Key Laboratory of Opto-Electronic Information Science and Technology,Ministry of Education,Tianjin 300072,China)
Abstract:Doppler ultrasonic endoscopic imaging system based on field programmable gate array(FPGA) was studied.The front-end ultrasonic signal reception circuit with high gain and low noise level was designed for the endoscopic system with small-sized ultrasonic probe and weak signal from the tissues.All-digital signal processing was performed to process the weak signals in FPGA,and quadrate demodulation and spectrum analysis were conducted,so that the system had the advantages including good circuit matching,high signal-to-noise ratio,high processing speed and small size,etc.The experimental platform based on the Doppler physical model was set up to verify the performance of the system.And the sonograms under different experiment conditions were compared,which verified the reasonability and correctness of the proposed system and the signal processing method.
Keywords:ultrasonic endoscope  weak signal  pulsed Doppler  quadrate demodulation  spectrum analysis
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