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(Investigative Ophthalmology and Visual Science. 1972;11:936-944.)
© 1972 by The Association for Research in Vision and Ophthalmology, Inc.

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Laser Doppler Measurements of Blood Flow in Capillary Tubes and Retinal Arteries

CHARLES RIVA 1, BENJAMIN ROSS 1, and GEORGE B. BENEDEK 1

1 Retina Foundation, Boston, Mass., Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Mass.

We have used the technique of Laser Doppler Velocimetry (LDV) to measure the velocity of blood folowing in retinal arteries of the rabbit. This technique does not require mechanical perturbation of the blood flow or alteration of chemical environment. It is more precise and clinically less demanding than previous methods, and gives information on the velocity distribution as well as the average velocity. We have also used LDV to measure the velocity distribution of whole blood, flowing in 200 µ diameter capillary tubes; our measurements agree with previous experimental results for the flow of erythrocyte ghost suspensions in larger tubes. Similar measurements on dilute suspensions of polystyrene spheres agree well with the hydrodynamic predictions.

Key Words: laser Doppler velocimeter • blood flow • retinal artery • flow velocity • velocity measurement

Submitted on June 5, 1972
Accepted on August 21, 1972




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