Targett R C, McIlroy M B
Ultrasound Med Biol. 1985 Jul-Aug;11(4):577-84. doi: 10.1016/0301-5629(85)90028-6.
We have used digital, microcomputer-based methods for the numerical analysis of pulsed, range-gated, ultrasonic Doppler blood velocity signals recorded with an axially aimed transducer from the ascending aorta of normal subjects. We investigated the spatial, temporal and amplitude resolution of our methods for recording and analysis, comparing aortic signals with test signals from a sine wave function generator. The spatial resolution of our system was found to be adequate in spite of the use of a relatively large sample volume. The temporal resolution was significantly influenced by the rate of change of velocity which affected the results of discrete fast Fourier transform analysis. The rate of increase in aortic blood velocity at the start of ejection was linear, following an initial jump in velocity. The amplitude resolution was affected by fluctuations in the amplitude of the Doppler signals. We conclude that our methods do not exaggerate the bluntness of the aortic velocity profile or the linearity of the increase in blood velocity at the start of left ventricular ejection.
我们运用了基于数字微型计算机的方法，对正常受试者升主动脉处轴向放置的换能器记录的脉冲、距离选通超声多普勒血流速度信号进行数值分析。我们研究了记录和分析方法的空间、时间和幅度分辨率，将主动脉信号与来自正弦波函数发生器的测试信号进行比较。尽管使用了相对较大的样本体积，但我们发现系统的空间分辨率是足够的。时间分辨率受到速度变化率的显著影响，这影响了离散快速傅里叶变换分析的结果。射血开始时主动脉血流速度的增加率是线性的，在速度初始跃升之后。幅度分辨率受到多普勒信号幅度波动的影响。我们得出结论，我们的方法不会夸大主动脉速度剖面的钝度或左心室射血开始时血流速度增加的线性度。
