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Representative in vivo endoscopic OCT images of swine (a,c) esophagus and (b,d) rectum. Images are displayed in unwrapped (Cartesian) and circumferential (polar) views, respectively. The characteristic layered structure of the esophagus and the columnar structure of the rectum are visible. The blue and orange arrows in (a) indicate the motor cable and inflation tube, respectively. The arrow in (b) indicates the aliased inner surface of the glass tube. Scale bars are 1 mm in tissue.
