Figure 2
From: OCT-Angiography reveals reduced vessel density in the deep retinal plexus of CADASIL patients
Exemplary en-face optical coherence tomography angiography (OCT-A) image of the choriocapillaris (CC) layer (30µm-slab between 30 µm and 60 µm below the inner retinal pigment epithelium reference). (A) Without image processing as used for CC decorrelation index analysis (average grey scale value of all pixels). (B) After Otsu thresholding as used for flow area analysis (percentage of the portion of white pixels against the whole scan area). (C) After Phansalkar thresholding as used for flow void analysis (proportion of white pixels accounted for by neighbouring white pixel regions greater than 10,000 µm2 [FV10000] and greater than 40,000 µm2 [FV40000]).
