Key result
Ultrasound measurement overestimates peak systolic velocity by 10% to 30% and time-averaged velocity by 30% to 50% when the beam-vessel angle increases from 30 to 70 degrees.
Ultrasound measurements of flow parameters in the radial and ulnar arteries are prone to clinically significant errors depending on the beam-vessel angle and the artery assessed.
Answers are grounded in this paper and cite their sources.
Beam angle errors may compromise forearm artery Doppler; leaves open in vivo validation of angle-corrected flow and shear estimates.
Parameters of blood flow measured by ultrasound in radial and ulnar arteries, such as flow velocity, flow rate and wall shear rate, are widely used in clinical practice and clinical research. Investigation of these measurements is useful for evaluating accuracy and providing knowledge of error sources. A method for simulating the spectral Doppler ultrasound measurement process was developed with computational fluid dynamics providing flow-field data. Specific scanning factors were adjusted to investigate their influence on estimation of the maximum velocity waveform, and flow rate and wall shear rate were derived using the Womersley equation. The overestimation in maximum velocity increases greatly (peak systolic from about 10% to 30%, time-averaged from about 30% to 50%) when the beam-vessel angle is changed from 30° to 70°. The Womersley equation was able to estimate flow rate in both arteries with less than 3% error, but performed better in the radial artery (2.3% overestimation) than the ulnar artery (15.4% underestimation) in estimating wall shear rate. It is concluded that measurements of flow parameters in the radial and ulnar arteries with clinical ultrasound scanners are prone to clinically significant errors.
No takes yet. Share an insight, caveat, or question.
Zhou et al. (2017) studied Healthy (n=1). Ultrasound measurement simulation vs. Computational fluid dynamics (CFD) reference values was evaluated on Error in maximum velocity estimation. Ultrasound measurement overestimates peak systolic velocity by 10% to 30% and time-averaged velocity by 30% to 50% when the beam-vessel angle increases from 30 to 70 degrees.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: