We describe a new optical coherence tomography catheter–endoscope for micrometer-scale, cross-sectional imaging in internal organ systems. The catheter–endoscope uses single-mode fiber optics with a novel transverse scanning design. The distal end of the catheter–endoscope uses a gradient-index lens with a microprism to emit and collect a single spatial-mode optical beam with specific focusing characteristics. The beam is scanned in a circumferential pattern and can image transverse cross sections through the structure into which it is inserted. A device with a diameter as small as 1.1 mm has been achieved, and imaging of in vitro human venous morphology is demonstrated.
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ErrataG. J. Tearney, M. E. Brezinski, J. G. Fujimoto, N. J. Weissman, S. A. Boppart, B. E. Bouma, and J. F. Southern, "Scanning single-mode fiber optic catheter–endoscope for optical coherence tomography: erratum," Opt. Lett. 21, 912-912 (1996)