Figure 6.

En-face OCTA images of the human small intestine in norm and ischemia with the corresponding histology. (a) A network of blood vessels of different diameters in the normal intestine wall; (b) ischemic bowel without extensive necrosis—noticeable rarefaction of the vasculature and in some areas the background formed by microvessels disappeared; (c) ischemic bowel with transmural necrosis. OCTA images in (a,b) demonstrate the microvascular network from the tissue surface down to a depth of 500 µm, which corresponds to the blood vessels of the serosal and longitudinal muscular layers, in (c) the blood vessels are not visible, only the signal noise (snow-like spots) is present. Black arrows in histological image (a) indicate non-damaged sub serous blood vessels. 1—intramural blood vessels, 2—light background from the microvessels. Histological specimens are stained with H&E. Scale bars 1 mm.