QUANTITATIVE ULTRASONIC BLOOD-FLOW MEASUREMENT IN DACRON GRAFTS

  • 1 January 1976
    • journal article
    • research article
    • Vol. 79  (5) , 569-572
Abstract
A quantitative directional Doppler system was used to determine blood flow in 8 mm aortoaortic Dacron grafts in dogs. The Doppler was calibrated with frequency standards and the output was integrated for 1 min intervals. With the probe held at an angle of 60.degree. to the flow axis, the average frequency of the Doppler shift was determined. Frequency was converted to velocity with the Doppler equation. Volume flow was calculated from the product of velocity and cross-sectional area of the graft. When compared with an electromagnetic flowmeter, the Doppler system was highly accurate with flow rates up to 900 ml/min. At flow rates above 900 ml/min, there was a significant decrease in Doppler output which probably is due to the effects of turbulence and background noise on the Doppler signal.

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