Forward-viewing resonant fiber-optic scanning endoscope of appropriate scanning speed for 3D OCT imaging.
A forward-viewing resonant fiber-optic endoscope of a scanning speed appropriate for a high-speed Fourier-domain optical coherence tomography (FD-OCT) system was developed to enable real-time, three-dimensional endoscopic OCT imaging. A new method was explored to conveniently tune the scanning frequency of a resonant fiber-optic scanner, by properly selecting the fiber-optic cantilever length, partially changing the mechanical property of the cantilever, and adding a weight to the cantilever tip. Systematic analyses indicated the resonant scanning frequency can be tuned over two orders of magnitude spanning from approximately 10Hz to approximately kHz. Such a flexible scanning frequency range makes it possible to set an appropriate scanning speed of the endoscope to match the different A-scan rates of a variety of FD-OCT systems. A 2.4-mm diameter, 62.5-Hz scanning endoscope appropriate to work with a 40-kHz swept-source OCT (SS-OCT) system was developed and demonstrated for 3D OCT imaging of biological tissues.
Huo
Li
L
Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA.
Xi
Jiefeng
J
Wu
Yicong
Y
Li
Xingde
X
D003481:Cuspid / Q000033:anatomy & histology; D019723:Endoscopes; D005336:Fiber Optic Technology / Q000295:instrumentation*; D005385:Fingers / Q000033:anatomy & histology; D006801:Humans; D009055:Mouth / Q000033:anatomy & histology; D019047:Phantoms, Imaging; D041623:Tomography, Optical Coherence / Q000295:instrumentation*