Electrostatic forward-viewing scanning probe for Doppler optical coherence tomography using a dissipative polymer catheter.
A novel flexible scanning optical probe is constructed with a finely etched optical fiber strung through a platinum coil in the lumen of a dissipative polymer. The packaged probe is 2.2 mm in diameter with a rigid length of 6mm when using a ball lens or 12 mm when scanning the fiber proximal to a gradient-index (GRIN) lens. Driven by constant high voltage (1-3 kV) at low current (< 5 microA), the probe oscillates to provide wide forward-viewing angle (13 degrees and 33 degrees with ball and GRIN lens designs, respectively) and high-frame-rate (10-140 fps) operation. Motion of the probe tip is observed with a high-speed camera and compared with theory. Optical coherence tomography (OCT) imaging with the probe is demonstrated with a wavelength-swept source laser. Images of an IR card as well as in vivo Doppler OCT images of a tadpole heart are presented. This optomechanical design offers a simple, inexpensive method to obtain a high-frame-rate forward-viewing scanning probe.
Munce
Nigel R
NR
Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
Mariampillai
Adrian
A
Standish
Beau A
BA
Pop
Mihaela
M
Anderson
Kevan J
KJ
Liu
George Y
GY
Luk
Tim
T
Courtney
Brian K
BK
Wright
Graham A
GA
Vitkin
I Alex
IA
Yang
Victor X D
VX
D002404:Catheterization; D004301:Doppler Effect; D004566:Electrodes; D004581:Electronics; D004867:Equipment Design; D055095:Optics and Photonics; D011108:Polymers / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods; D055672:Static Electricity; D013997:Time Factors; D041623:Tomography, Optical Coherence / Q000295:instrumentation* / Q000379:methods; D014057:Tomography, X-Ray Computed
D011108:Polymers