Scanning single-mode fiber optic catheter–endoscope for optical coherence tomography

TLDR

The study introduces a novel optical coherence tomography catheter–endoscope designed for micrometer‑scale, cross‑sectional imaging of internal organs. The device employs single‑mode fiber optics with a gradient‑index lens and microprism to emit a single spatial‑mode beam that is circumferentially scanned, enabling transverse cross‑sectional imaging. The prototype, 1.1 mm in diameter, successfully imaged in‑vitro human venous morphology.

Abstract

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.