一种适用于超声多普勒血流速度测量的混沌调频连续波的研究

彭京思; 彭虎

doi:10.7498/aps.61.248701

摘要

虽然脉冲多普勒系统测量血流速度时, 能够确定距离, 但可测速度范围受频率混淆限制, 同时多普勒信号的信噪比差. 连续波多普勒系统提供了较高的多普勒信号的信噪比, 并没有可测速度限制, 但无法提供距离信息. 线性调频及正弦调频连续波测量系统, 能够提供拥有距离信息的高信噪比多普勒信号, 同时杂波功率低, 但由于多普勒信号频谱具有周期性, 存在一定的距离模糊. 针对存在的问题, 提出基于混沌调频连续波的超声多普勒血流速度测量方法, 它不仅具有较高的信噪比, 而且由于多普勒信号频谱无周期性, 因此不存在距离模糊. 经过原理分析及仿真实验, 验证了混沌调频连续波的有效性.

关键词:

超声 /
多普勒 /
血流速度 /
混沌调频

Abstract

Although a pulsed-wave (PW) Doppler system can measure blood velocity with range information, measurable velocity is limited by frequency aliasing, and signal-noise-ratio (SNR) is poor. Continuous wave (CW) Doppler system offers a higher SNR in Doppler signal and no measurable velocity limitations but does not provide ranging information. Linear frequency-modulated continuous wave (LFMCW) and sine frequency-modulating continuous wave are able to provide high SNR Doppler signals with ranging information, and low clutter power, but with a certain range ambiguity due to signal periodicity of the Doppler signal spectrum. Various efforts have been made to improve the SNR, range resolution, and velocity limitations with FMCW Doppler system. An ultrasonic doppler blood flow velocity measurement system based on chaotic FMCW is proposed which has a higher SNR with no range ambiguity because of the aperiodicity of the Doppler signal spectrum. Principle analysis and experimental simulation show that the effectiveness of the new system is verified.

Keywords:

作者及机构信息

彭京思¹,
彭虎²

1.
中国科学技术大学电子科学与技术系, 合肥 230027;

2.
合肥工业大学生物医学工程系, 合肥 230009

基金项目: 国家自然科学基金(批准号: 61172037)资助的课题.

Authors and contacts

Peng Jing-Si¹,
Peng Hu²

1.
Department of Electronic science and Technology, University of Science and Technology of China, Hefei 230027, China;

2.
Department of Biomedical Engineering, Hefei University of Technology, Hefei 230009, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 61172037).

参考文献

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[3]	Jeremy Bercoff, Gabriel Montaldo, Thanasis Loupas, David Savery, Fabien MÉZiÉRe, Mathias Fink, Mickael Tanter 2011 IEEE Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 58 134
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施引文献

[1]	Wilhjelm J E, Pedersen P C 1993 Ferroelectrics, And Frequency Control 40 366
[2]	Lasse Lovstakken, Hans Torp 2010 IEEE International Ultrasonics Symposium Proceedings USA, Oct. 11-14, 2010 p1198
[3]	Jeremy Bercoff, Gabriel Montaldo, Thanasis Loupas, David Savery, Fabien MÉZiÉRe, Mathias Fink, Mickael Tanter 2011 IEEE Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 58 134
[4]	Masanori Kunita, Masamitsu Sudo, Takashi Mochizuki 2008 IEEE International Ultrasonics Symposium Proceedings USA, Nov. 2-5, 2008 p1366
[5]	Cui Z Z, Song S H, Xu L X Theoty of Proximity Fuse. (Beijing: Beijing Institute of Technology Press) p68 (in Chinese) [崔占忠, 宋世和, 徐立新 2005 近炸引信原理 (北京: 北京理工大学出版社) 第68页]
[6]	Masanori Kunita, Masamitsu Sudo, Shinya Inoue, Mutsuhiro Akahane 2010 IEEE Transactions On Ultrasonics, Ferroelectrics, And Frequency Control 57 p1064
[7]	Lv Q, Gu H, Su W M 2010 J. Elect. Inf. Tech. 32 277 (in Chinese) [吕婧, 顾红, 苏卫民 2010 电子与信息学报 32 377]
[8]	Stove A G 1992 Radar and Signal Processing, IEE Proceedings F 139 343
[9]	Liu G S, Sun G M, Gu H, Zhu X H 1995 Modern. Radar. 17 (6) 20 (in Chinese) [刘国岁, 孙光民, 顾红, 朱晓华 1995 现代雷达 17(6) 20]
[10]	Jiang F 2009 Ph. D. Dissertation (Nanjing: Nanjing University of Science and Technology) (in Chinese) [蒋飞 2009 博士学位论文 (南京: 南京理工大学)]
[11]	Yu S M 2011 Chaotic Systems and Chaotic Circuits: Principle, Design and Its Application in Communications (Xi'an: Xi Dian University Press) p113 (in Chinese) [禹思敏 2011 混沌系统与混沌电路-原理、设计及其在通信中的应用 (西安: 西安电子科技大学出版社) 第113页]

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