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Optical Engineering

Visualization And Measurement Of Retinal Blood Flow By Means Of Laser Speckle Photography
Author(s): A. F. Fercher; M. Peukert; E. Roth
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Paper Abstract

We present results of an investigation into the visualization and measurement of retinal blood flow distribution by means of single-exposure laser-speckle fundus photography. The technique relies on the speckle effect produced when laser light is scattered at a diffusing structure and on the fact that the speckle will be averaged out to some extent when the structure concerned is moving and/or decorrelating. We discuss two alternative techniques used to process the specklegrams obtained from the retina. The first technique uses an analog optical spatial filtering procedure to enhance the resulting variations in speckle contrast. Although first results have shown the basic usefulness of this technique, it suffers from fundamental disadvantages. In the second technique we digitize the specklegram and use digital image processing techniques to (1) convert contrast variations in the fundus photography into color variations and (2) obtain the blood flow of the vessels with a reasonably low statistical error.

Paper Details

Date Published: 1 June 1986
PDF: 5 pages
Opt. Eng. 25(6) 256731 doi: 10.1117/12.7973897
Published in: Optical Engineering Volume 25, Issue 6
Show Author Affiliations
A. F. Fercher, University of Essen (Germany)
M. Peukert, University of Essen (Germany)
E. Roth, University of Essen (Germany)

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