title: Two-axis magnetically-driven MEMS scanning catheter for endoscopic high-speed optical coherence tomography.
abstract: 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.
authors: Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114 USA.
authors: Ki Hean
authors: KH
authors: Kim
authors: B Hyle
authors: BH
authors: Park
authors: Gopi N
authors: GN
authors: Maguluri
authors: Tom W
authors: TW
authors: Lee
authors: Fran J
authors: FJ
authors: Rogomentich
authors: Mirela G
authors: MG
authors: Bancu
authors: Brett E
authors: BE
authors: Bouma
authors: Johannes F
authors: JF
authors: de Boer
authors: Jonathan J
authors: JJ
authors: Bernstein
mesh_terms: D002404:Catheterization; D017076:Computer-Aided Design; D019723:Endoscopes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008280:Magnetics / Q000295:instrumentation*; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000295:instrumentation*