In model experiments, droplets of iodized oil were injected into a controlled blood flow during cinefluorography. In non-pulsatile flows, the velocity of droplets was representative of the true flow velocity. Polynominal regression curves were constructed. For tubings 5, 10, and 17 mm in diameter and blood flow velocities within ranges of medical interest, the average deviation of the polynominal curve from the line of identity was calculated as: plusmn;1.37 cm/sec, plusmn;1.96 cm/sec, and plusmn;2.45 cm/sec, respectively. Pulsatile flow within the range of velocity, 0ndash;29 cm/sec, and acceleration, 0ndash;2 G, was also investigated. The curves referring to displacement, velocity, and acceleration of the droplet and the true flow were superimposed. A phase delay of 5 to 10 msec was observed. It is suggested that the droplet motion can be used to measure blood flow in the human portal vein and in the canine portal, pulmonary, and caval veins.
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