Fig. 2.

(a) Single frame from the 3D-rendered volume of the PAT data showing the vasculature of a healthy subject (video available at Visualization 1 ^{(6.7MB, MOV)} ). scale bars: 1 mm (b) Diagram of skin layers and vascular network (adapted from [26]) and MIP images calculated from the four depth ranges from the volume in (a) showing the vasculature in the papillary dermis (red frame), superficial vascular plexus (green frame), deep vascular plexus (blue frame), and subcutaneous vessels (yellow frame). Because of the resolution limitation of the system, the individual vessels of the capillary loop system and the superficial vascular plexus (diameter ranging from 4 µm to 35 µm) are not discerned. Few vessels seen mostly in the top-right portion of the green frame are the interconnecting vessels.