Johnston K W, Maruzzo B C, Cobbold R S
Arch Surg. 1977 Nov;112(11):1335-42. doi: 10.1001/archsurg.1977.01370110069007.
Continuous-wave Doppler ultrasound flowmeters are essential instruments for the vascular surgeon. Unfortunately, when used for quantitative purposes, they yield a flow velocity waveform that is substantially in error. Current directional continuous-wave Doppler velocimeters used a O-crossing detector to convert the Doppler signal to a waveform. Unfortunately, there are several inherent problems with this technique, and velocity waveforms are produced that have significant artifacts or errors. In this report, it is shown that a multifilter system is a simple, inexpensive alternative to systems using a O-crossing detector, and furthermore, permits real-time display of the Doppler waveform. The severity of the underlying arterial disease can be quantified by the calculation of pulsatility index. The pulsatility index was calculated from the Doppler waveforms recorded from peripheral arteries in 155 limbs and showed an excellent correlation with the severity of atherosclerosis as assessed by arteriography.
连续波多普勒超声流量计是血管外科医生的重要工具。不幸的是，当用于定量目的时，它们产生的流速波形存在很大误差。当前的定向连续波多普勒测速仪使用过零检测器将多普勒信号转换为波形。不幸的是，这种技术存在几个固有问题，并且产生的速度波形存在明显的伪像或误差。在本报告中，表明多滤波器系统是使用过零检测器的系统的一种简单、廉价的替代方案，并且还允许实时显示多普勒波形。潜在动脉疾病的严重程度可以通过计算搏动指数来量化。搏动指数是根据从155条肢体的外周动脉记录的多普勒波形计算得出的，并且与通过动脉造影评估的动脉粥样硬化严重程度显示出极好的相关性。
