Ranke C, Hendrickx P, Roth U, Brassel F, Creutzig A, Alexander K
Department of Angiology, Medical School, Hannover, West Germany.
J Clin Ultrasound. 1992 Mar-Apr;20(3):187-93. doi: 10.1002/jcu.1870200305.
Accuracy of two systems--conventional (DRF 400, Diasonics) and color-coded (Angiodynograph, Quantum/Phillips) image-directed Doppler ultrasonography--was investigated using an in vitro model that generated both monophasic and triphasic pulsatile flow patterns. Estimated and actual blood volume flow rates showed good correlations, but the sampling with a hand-held transducer led to wide variations in measurement error for the conventional (-69.2% to 50%) and the color-coded (-79.3% to 265.7%) systems. By performing multiple measurements, one could improve accuracy considering only the maximal values of a series instead of the mean values. Accuracy was impaired by interposed muscular or fatty tissue due to false low time-average velocity measurements caused by a loss of Doppler signal. Comparison of both systems revealed significant differences between pulsatility index values (p less than 0.001), blood flow velocities (p less than 0.001), and blood volume flow rates (p less than 0.05 for program flow, p less than 0.001 for manual and automatic flow program of the color-coded system).
使用一个能产生单相和三相脉动血流模式的体外模型，研究了两种系统——传统的（DRF 400，Diasonics公司）和彩色编码的（血管动力仪，Quantum/飞利浦公司）图像引导多普勒超声检查——的准确性。估计的和实际的血容量流速显示出良好的相关性，但使用手持换能器进行采样时，传统系统（-69.2%至50%）和彩色编码系统（-79.3%至265.7%）的测量误差存在很大差异。通过进行多次测量，仅考虑一系列的最大值而非平均值，可提高准确性。由于多普勒信号丢失导致错误的低时间平均速度测量，插入的肌肉或脂肪组织会损害准确性。两种系统的比较显示，搏动指数值（p<0.001）、血流速度（p<0.001）和血容量流速（彩色编码系统的程序流速p<0.05，手动和自动流速程序p<0.001）之间存在显著差异。
