Key result
A pulsed Doppler ultrasound system was successfully characterized in preliminary in vitro experiments to measure velocity profiles and quantify turbulent intensity in poststenotic flow.
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A pulsed Doppler ultrasound system can effectively measure velocity profiles and quantify flow disturbances in prosthetic arteries in vitro.
For the investigation of flow through prosthetic arteries a pulsed Doppler ultrasound system has been characterized. Preliminary in vitro experiments using this system are described; they verify its suitability for making velocity profile and flow disturbance measurements. The output from a frequency tracker is compared with spectral analysis of Doppler signals for both laminar and turbulent flow regimes and the root mean square fluctuations on the tracker output signal are used to identify transition from laminar to turbulent flow. In addition, the turbulent intensity of poststenotic flow is quantified at several axial locations and for different rates of flow. Finally, we present velocity profile measurements which were obtained using a deconvolution technique to account for the finite size of the sample volume.
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Black et al. (1989) studied Flow through prosthetic arteries. Pulsed Doppler ultrasound system vs. Spectral analysis of Doppler signals was evaluated on Velocity profile and flow disturbance measurements. A pulsed Doppler ultrasound system was successfully characterized in preliminary in vitro experiments to measure velocity profiles and quantify turbulent intensity in poststenotic flow.
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