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首页> 外文会议>Engineering in Medicine and Biology Society, 1998. Proceedings of the 20th Annual International Conference of the IEEE >The application of cross-correlation method in blood flow sonography
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The application of cross-correlation method in blood flow sonography

机译：互相关方法在血流超声检查中的应用

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摘要

The conventional Pulsed Wave (PW) Doppler blood flow analyzers with the sonogram display are widely used in clinical diagnosis. However, the system suffers from spectrum aliasing problems when the velocities exceed the Nyquist limit. Time domain Cross-Correlation (CC) method is superior to PW in the high velocity measurements. But, instead of the sonogram, the CC method can only provide the average velocity in the sample volume. Combining the PW with the CC method, the authors propose a joint CC-PW method which takes advantage of the sonogram output, but overcomes the aliasing problems. With this new method, the delay times of the received RF echoes from pulse-to-pulse are estimated by the CC method. The series of delay time with the related maximum value in cross-correlation function are then used to form a time sequence, which is finally sent to a spectrum analyzer to produce the sonogram. The principle of the method is described in detail and experimental results are given in the paper.
机译：具有超声显示的常规脉搏波（PW）多普勒血流分析仪广泛用于临床诊断。但是，当速度超过奈奎斯特极限时，系统会出现频谱混叠问题。在高速测量中，时域互相关（CC）方法优于PW。但是，代替超声检查，CC方法只能提供样品体积中的平均速度。结合PW和CC方法，作者提出了一种联合CC-PW方法，该方法利用了超声波输出，但克服了混叠问题。使用这种新方法，可以通过CC方法估算脉冲间接收到的RF回波的延迟时间。然后使用互相关函数中具有相关最大值的一系列延迟时间来形成时间序列，最后将其发送到频谱分析仪以生成超声图。详细介绍了该方法的原理，并给出了实验结果。

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