fig2
From: Distal- to- proximal sequential ICG injection technique (DOPSIT) for lymphatic vessels mapping
Figure 2. An illustration of a leg and its sagittal cross section showing the difference in the flow of injected ICG at levels 1 and 2, which are respectively distal and proximal to dermal backflow (DB)/zone on unfavorable pressure gradient. The green dots depict the ICG and the white arrows show the direction of ICG flow. A single collector channel in yellow is shown in each image for simplification, with widened central part representing the zone of unfavorable pressure gradient. Injection at level 2 bypasses this zone and ICG resumes antegrade flow.
