Figure 3.

Vascular abnormalities in three capillary plexuses in NPDR and PDR. First two columns are NPDR and last two columns are PDR. SSI is reported. Rows from top to bottom: SCP, MCP, and DCP. Under each image, the corresponding B-scan shows red flow overlay and red and green segmentation boundaries. Below B-scans, the vessel density (density), PAN, and AFI are reported. Arrows represent vascular abnormalities, including microaneurysms, dilated vessels, intraretinal microvascular abnormalities, and neovascularization. Large oval (SCP, left) represents nonperfusion, small circles (DCP, left) indicate one instance of projection artifact of a microaneurysm from the MCP onto the DCP. Ovals and arrows on the B-scan correspond to the en face to show the location of the abnormality within the retina. Projection artifact was minimized using our segmentation scheme, as discussed. Straight dark line in the deep plexus results from a failure in the segmentation algorithm (asterisk).