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Applied Optics

Applied Optics


  • Vol. 18, Iss. 13 — Jul. 1, 1979
  • pp: 2301–2306

Bidirectional LDV system for absolute measurement of blood speed in retinal vessels

Charles E. Riva, Gilbert T. Feke, Bruno Eberli, and Vili Benary  »View Author Affiliations

Applied Optics, Vol. 18, Issue 13, pp. 2301-2306 (1979)

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A laser Doppler technique which provides a means of obtaining absolute measurements of the speed of red blood cells (RBCs) flowing in individual retinal vessels is described. Doppler-shift frequency spectra of laser light scattered from the RBCs are obtained for two directions of the scattered light. Each spectrum exhibits a cutoff frequency that is directly related to the maximum RBC speed (Vmax). The difference in cutoff frequencies is used to obtain an absolute measure of Vmax that is independent of the exact orientation of the vessel and of the relative direction of the incident and scattered beams with respect to the flow direction. Preliminary measurements obtained using a prototype instrument are presented.

© 1979 Optical Society of America

Original Manuscript: October 13, 1978
Published: July 1, 1979

Charles E. Riva, Gilbert T. Feke, Bruno Eberli, and Vili Benary, "Bidirectional LDV system for absolute measurement of blood speed in retinal vessels," Appl. Opt. 18, 2301-2306 (1979)

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