Abstract

AbstractOptical coherence tomography angiography (OCTA) is a functional extension of OCT that allows for the non‐invasive visualization of the ocular microvasculature. The technique is used for the visualization of neovascularization in the choroid, retina and cornea. In addition, several investigators have tried to quantify OCTA data. This is not an easy task because the decorrelation signal in OCTA does not linearly scale with blood velocity. In the retinal microvasculature the most frequently used parameter is vessel density. This requires post‐image processing methods including Modified Bayesian Residual Transform (MBRT) based filters, Hessian filters, Gabor filters and Gaussian filters. In the choroid the most frequently used approach is related to quantification of choriocapillaris flow voids. Again, a variety of different algorithms were proposed to quantify such flow voids providing different results and variable reproducibility. The present talk will summarize different techniques and also provide an outlook on quantification of widefield OCTA images.

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