Figure 5. Results of vessel valid visibility measure of 6×6 mm² scans of a same subject.

A-D: Original SRL angiograms overlaid with ring showing ROI, with inner diameter of 0.72 mm (red) and outer diameter of 2.00 mm (green) of 4 systems; E-H: Images after vesselness filter and binary vessel mask of (A-D);. I-L: Calculated vessels in ROI after skeletonization and thresholding of E-H.