Two-axis magnetically-driven MEMS scanning catheter for endoscopic high-speed optical coherence tomography

Opt Express. 2007 Dec 24;15(26):18130-40. doi: 10.1364/oe.15.018130.


A two-axis scanning catheter was developed for 3D endoscopic imaging with spectral domain optical coherence tomography (SD-OCT). The catheter incorporates a micro-mirror scanner implemented with microelectromechanical systems (MEMS) technology: the micro-mirror is mounted on a two-axis gimbal comprised of folded flexure hinges and is actuated by magnetic field. The scanner can run either statically in both axes or at the resonant frequency (>= 350Hz) for the fast axis. The assembled catheter has an outer diameter of 2.8 mm and a rigid part of 12 mm in length. Its scanning range is +/- 20 in optical angle in both axes with low voltages (1 approximately 3V), resulting in a scannable length of approximately 1 mm at the surface in both axes, even with the small catheter size. The catheter was incorporated with a multi-functional SD-OCT system for 3D endoscopic imaging. Both intensity and polarization-sensitive images could be acquired simultaneously at 18.5K axial scans/s. In vivo 3D images of human fingertips and oral cavity tissue are presented as a demonstration.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Catheterization*
  • Computer-Aided Design
  • Endoscopes*
  • Equipment Design
  • Equipment Failure Analysis
  • Magnetics / instrumentation*
  • Micro-Electrical-Mechanical Systems / instrumentation*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Tomography, Optical Coherence / instrumentation*