Griffith J M, McLeod F D, Leroy A F
Med Instrum. 1977 May-Jun;11(3):139-43.
Accurate quantitation of blood flow patterns, particularly in the physiological state, is important to the successful study of several problems in biomedical research. The pulsed Doppler ultrasonic flowmeter offers promise of overcoming some of the difficulties present in other methods. This flowmeter can be either implantable or noninvasive. Although a number of papers describe important design criteria, the design or selection of a Doppler system for a given task remains a complex matter involving many compromises based on theoretical considerations and very limited data. Experimental data from well-defined flows are needed to help identify those areas in which ultrasonic flowmeters can be most useful. This paper defines and evaluates two important parameters for the pulsed Doppler ultrasonic flowmeter by comparing experimental results with those predicted theorectically. The first parameter is velocity accuracy; the second parameter is range resolution. Findings show that centerline flow velocities in circular tubes can be estimated to within a few percent of the correct value, and that a 1.5-mm range resolution can be realized with the system tested.
准确量化血流模式，尤其是在生理状态下，对于成功研究生物医学研究中的若干问题至关重要。脉冲多普勒超声流量计有望克服其他方法中存在的一些困难。这种流量计既可以植入体内，也可以是非侵入性的。尽管有许多论文描述了重要的设计标准，但针对特定任务设计或选择多普勒系统仍然是一个复杂的问题，需要基于理论考虑和非常有限的数据进行许多权衡。需要来自明确界定的血流的实验数据，以帮助确定超声流量计最有用的领域。本文通过将实验结果与理论预测结果进行比较，定义并评估了脉冲多普勒超声流量计的两个重要参数。第一个参数是速度精度；第二个参数是距离分辨率。研究结果表明，圆形管道中的中心线流速可以估计到正确值的百分之几以内，并且使用测试的系统可以实现1.5毫米的距离分辨率。
