1 September 2010 Absolute blood velocity measured with a modified fundus camera
Author Affiliations +
J. of Biomedical Optics, 15(5), 056014 (2010). doi:10.1117/1.3494565
We present a new method for the quantitative estimation of blood flow velocity, based on the use of the Radon transform. The specific application is for measurement of blood flow velocity in the retina. Our modified fundus camera uses illumination from a green LED and captures imagery with a high-speed CCD camera. The basic theory is presented, and typical results are shown for an in vitro flow model using blood in a capillary tube. Subsequently, representative results are shown for representative fundus imagery. This approach provides absolute velocity and flow direction along the vessel centerline or any lateral displacement therefrom. We also provide an error analysis allowing estimation of confidence intervals for the estimated velocity.
Donald D. Duncan, Paul Lemaillet, Mohamed Ibrahim, Quan Dong Nguyen, Matthias Hiller, Jessica Ramella-Roman, "Absolute blood velocity measured with a modified fundus camera," Journal of Biomedical Optics 15(5), 056014 (1 September 2010). https://doi.org/10.1117/1.3494565



Velocity measurements

Error analysis

Signal to noise ratio

In vitro testing

Radon transform

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