Fig. 6.

OCT angiograms of diabetic retinopathy cases obtained with Revo NX. Left row – not filtered images. Right row – angiograms after application of the elliptical directional median filtering. Case 1: non-proliferative, early stage; scan protocol 1. Case 2: non-proliferative, enlarged foveal avascular zone, decreased vascular density visible. Case 3: proliferative, after panretinal laser photocoagulation, nonperfusion areas and tortuous vessels present. Pink circle and arrows – foveal avascular zone. Green arrows – non-perfusion areas. Blue arrows – microaneurysms. Case 1 and 2 – image size 3 x 3 mm (scan protocol 1 in Table 2). Case 3 – image size 5 x5 mm (scan protocol 2 in Table 2).