Doppler optical coherence tomography with a micro-electro-mechanical membrane mirror for high-speed dynamic focus tracking.
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.
Yang
Victor X D
VX
Ontario Cancer Institute, University Health Network, Toronto, Ontario, Canada. victor.yang@utoronto.ca
Mao
Youxin
Y
Standish
Beau A
BA
Munce
Nigel R
NR
Chiu
Stephanie
S
Burnes
Daina
D
Wilson
Brian C
BC
Vitkin
I Alex
IA
Himmer
Phillip A
PA
Dickensheets
David L
DL
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
D008567:Membranes, Artificial