Fig. 7.

(a) Representative ex vivo OCT image of fresh mouse esophageal tissue when the needle was rotated in a 20-gauge biopsy needle. M1: mucosa; S: submucosa; M2: muscularis. The structure indicated by the arrows is epithelium. (b) Typical ex vivo OCT image of fresh pig pancreatic tail when the needle was directly inserted in the sample and retracted. The structure indicated by the circle may be related to islets of Langerhans. The inset is a two times magnified area marked by the dashed rectangle.