摘要
为了解决基于脉冲波和普通连续波测量方法的不足,我们采用了基于正弦调频连续波的多普勒血流速度测量方法。利用正弦调频连续波作为发射信号,通过延迟信号与回波信号相乘解调,然后进行频谱分析,得到多普勒频移信息。本研究通过原理分析和仿真实验,验证了基于正弦调频连续波方法的有效性,并探讨了调频参数对测量结果的影响。结果表明,该方法拥有基于连续波方法的一般特点,并能够在测量速度的同时获得距离信息。
To solve the problems of those measurement systems based on pulsed wave and common continuous wave,we modified the Doppler blood flow velocity measurement system with Sine Frequency-modulating Continuous Wave.With Sine Frequency-modulating Continuous Wave as transmit signal,the Doppler frequency shift information could be obtained through multiplication demodulation of delayed signal and echo signal,followed by spectrum analysis.Through principle analysis and simulation experiment,we tested and verified the effectiveness of the measurement systems based on Sine Frequency-modulating Continuous Wave and further discussed the impact of the modulation parameter on Doppler frequency spectrum.The result shows that this new measurement system not only share the general advantages with the systems based on continuous wave,but also distinguish itself by measuring blood velocity with range information.
出处
《生物医学工程研究》
2012年第2期70-73,共4页
Journal Of Biomedical Engineering Research
基金
国家自然科学基金资助项目(61172037)
关键词
超声
多普勒
血流速度
正弦调频
连续波
Ultrasound
Doppler
Blood velocity
Sine frequency-modulating
Continuous wave
