Color and conventional image-directed Doppler ultrasonography: Accuracy and sources of error in quantitative blood flow measurements

✍ Scribed by Carsten Ranke; Philippe Hendrickx; Ulrich Roth; Friedhelm Brassel; Andreas Creutzig; Klaus Alexander

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 588 KB
• Volume: 20
• Category: Article
• ISSN: 0091-2751
• DOI: 10.1002/jcu.1870200305

✦ Synopsis

Accuracy of two systems-conventional (DRF 400, Diasonics) and colorcoded (Angiodynograph, QuantudPhillips) 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 colorcoded (-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 < 0.001), blood flow velocities 0, < 0.001), and blood volume flow rates (p < 0.05 for program flow, p < 0.001 for manual and automatic flow program of the color-coded system). Indexing Words: Pulsed Doppler In vitro model Color Doppler Blood flow velocity FIGURE 2. Pulsatile waveforms generated in vitro. (A) Low-resistance monophasic waveform, simulating the flow characteristics of a human carotid artery. (B) High-resistance triphasic waveform, simulating the flow characteristics of a human femoral artery.