Abstract
Endoscopic optical coherence tomography (OCT) instruments are mostly side viewing and rely on at least one proximal scan, thus limiting accuracy of volumetric imaging and en face visualization. Previous forward-viewing OCT devices had limited axial scan speeds. We report a forward-viewing fiber scanning 3D-OCT probe with 900μm field of view and 5μm transverse resolution, imaging at 1MHz axial scan rate in the human gastrointestinal tract. The probe is 3.3mm diameter and 20mm rigid length, thus enabling passage through the endoscopic channel. The scanner has 1.8kHz resonant frequency, and each volumetric acquisition takes 0.17s with 2 volumes/s display. 3D-OCT and angiography imaging of the colon was performed during surveillance colonoscopy.
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