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Piezoelectric-transducer-based miniature catheter for ultrahigh-speed endoscopic optical coherence tomography

Authors
Journal
Biomedical Optics Express
2156-7085
Publisher
The Optical Society
Publication Date
Volume
2
Issue
8
Identifiers
DOI: 10.1364/boe.2.002438
Keywords
  • Endoscopes
  • Catheters And Micro-Optics
Disciplines
  • Medicine

Abstract

We developed a piezoelectric-transducer- (PZT) based miniature catheter with an outer diameter of 3.5 mm for ultrahigh-speed endoscopic optical coherence tomography (OCT). A miniaturized PZT bender actuates a fiber and the beam is scanned through a GRIN lens and micro-prism to provide high-speed, side-viewing capability. The probe optics can be pulled back over a long distance to acquire three-dimensional (3D) data sets covering a large area. Imaging is performed with 11 μm axial resolution in air (8 μm in tissue) and 20 μm transverse resolution, at 960 frames per second with a Fourier domain mode-locked laser operating at 480 kHz axial scan rate. Using a high-speed data acquisition system, endoscopic OCT imaging of the rabbit esophagus and colon in vivo and human colon specimens ex vivo is demonstrated.

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