title: Doppler optical coherence tomography with a micro-electro-mechanical membrane mirror for high-speed dynamic focus tracking.
abstract: An elliptical microelectromechanical system (MEMS) membrane mirror is electrostatically actuated to dynamically adjust the optical beam focus and track the axial scanning of the coherence gate in a Doppler optical coherence tomography (DOCT) system at 8 kHz. The MEMS mirror is designed to maintain a constant numerical aperture of approximately 0.13 and a spot size of approximately 6.7 microm over an imaging depth of 1mm in water, which improves imaging performance in resolving microspheres in gel samples and Doppler shift estimation precision in a flow phantom. The mirror's small size (1.4 mm x 1 mm) will allow integration with endoscopic MEMS-DOCT for in vivo applications.
authors.affiliation: Ontario Cancer Institute, University Health Network, Toronto, Ontario, Canada. victor.yang@utoronto.ca
authors.forename: Victor X D
authors.initials: VX
authors.lastname: Yang
authors.forename: Youxin
authors.initials: Y
authors.lastname: Mao
authors.forename: Beau A
authors.initials: BA
authors.lastname: Standish
authors.forename: Nigel R
authors.initials: NR
authors.lastname: Munce
authors.forename: Stephanie
authors.initials: S
authors.lastname: Chiu
authors.forename: Daina
authors.initials: D
authors.lastname: Burnes
authors.forename: Brian C
authors.initials: BC
authors.lastname: Wilson
authors.forename: I Alex
authors.initials: IA
authors.lastname: Vitkin
authors.forename: Phillip A
authors.initials: PA
authors.lastname: Himmer
authors.forename: David L
authors.initials: DL
authors.lastname: Dickensheets
mesh_terms: D003199:Computer Systems; D004301:Doppler Effect; D004581:Electronics; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods; D007368:Interferometry / Q000295:instrumentation* / Q000379:methods; D007909:Lenses; D008567:Membranes, Artificial; D008904:Miniaturization; D041623:Tomography, Optical Coherence / Q000295:instrumentation* / Q000379:methods
chemical_list: D008567:Membranes, Artificial