Abstract

We have measured Doppler shift frequency spectra (DSFS) of laser light scattered from red blood cells (RBC’s) flowing through individual human retinal vessels. Each spectrum exhibits a cutoff frequency which is directly related to the maximum RBC velocity at the measurement site. Meaningful DSFS can be measured in times as short as 0.1 s. DSFS obtained from suspensions of polystyrene spheres and RBC’s flowing through glass capillary tubes are used to illustrate the basic principles of the technique and to aid in the interpretation of the in vivo measurements. Our measurements show that maximum RBC velocities in retinal arteries vary markedly during each cardiac cycle.

© 1978 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Bidirectional LDV system for absolute measurement of blood speed in retinal vessels

Charles E. Riva, Gilbert T. Feke, Bruno Eberli, and Vili Benary
Appl. Opt. 18(13) 2301-2306 (1979)

Retinal laser Doppler velocimetry: toward its computer-assisted clinical use

Benno L. Petrig and Charles E. Riva
Appl. Opt. 27(6) 1126-1134 (1988)

Fundus camera based retinal LDV

Charles E. Riva, Juan E. Grunwald, Stephen H. Sinclair, and Kevin O’Keefe
Appl. Opt. 20(1) 117-120 (1981)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription