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In vivo OCT images of the upper lip obtained from a healthy 24-year-old male including a (a) 2D image, (b) 3D image, and (c)–(h) projection-view angiographies obtained at varying depths of 300–310, 350–360, 400–410, 450–460, 500–510, and 300–600 μm, respectively, beneath the lip surface. E: epidermis, LP: lamina propria, and SG: salivary gland. The scale bar in (a) represents 500 μm. The yellow arrows indicate the twists of capillaries.
