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Fourier Domain Optical Coherence Tomography for Retinal Imaging with 800-nm Swept Source: Real-time Resampling in K-Domain
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- Authors
- Sang-Won Lee, Hyun-Woo Song, Bong-Kyu Kim, Moon-Youn Jung, Seung-Hwan Kim, Jae-Du Cho, Chang-Seok Kim
- Issue Date
- 2011-09
- Citation
- Journal of the Optical Society of Korea, v.15, no.3, pp.293-299
- ISSN
- 1226-4776
- Publisher
- 한국광학회 (OSK)
- Language
- English
- Type
- Journal Article
- Abstract
- In this study, we demonstrated Fourier-domain/swept-source optical coherence tomography (FD/SS-OCT) at a center wavelength of 800 nm for in vivo human retinal imaging. A wavelength-swept source was constructed with a semiconductor optical amplifier, a fiber Fabry-Perot tunable filter, isolators, and a fiber coupler in a ring cavity. Our swept source produced a laser output with a tuning range of 42 nm (779 to 821 nm) and an average power of 3.9 mW. The wavelength-swept speed in this configuration with bidirectionality is 2,000 axial scans per second. In addition, we suggested a modified zero-crossing method to achieve equal sample spacing in the wavenumber (k) domain and to increase the image depth range. FD/SS-OCT has a sensitivity of ~89.7 dB and an axial resolution of 10.4 μm in air. When a retinal image with 2,000 A-lines/frame is obtained, an acquisition speed of 2.0 fps is achieved.
- KSP Keywords
- Average Power, Axial Resolution, Center wavelength, Depth range, Fiber Fabry-Perot(F-P), Fiber Fabry-Perot tunable filter, Fiber coupler, Fourier domain optical coherence tomography, Laser output, Optical Coherence Tomography(OCT), Real-Time