15 February 2011 Fast dispersion encoded full range OCT for retinal imaging at 800 nm and 1060 nm
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Abstract
The dispersion mismatch between sample and reference arm in frequency-domain OCT can be used to iteratively suppress complex conjugate artifacts and thereby increase the imaging range. We propose a fast dispersion encoded full range (DEFR) algorithm that detects multiple signal components per iteration. The influence of different dispersion levels on the reconstruction quality is analyzed for in vivo retinal tomograms at 800 nm. Best results have been achieved with about 30 mm SF11, with neglectable resolution decrease due to finite resolution of the spectrometer. Our fast DEFR algorithm achieves an average suppression ratio of 55 dB and converges within 5 to 10 iterations. The processing time on non-dedicated hardware was 5 to 10 seconds for tomograms with 512 depth scans and 4096 sampling points per depth scan. Application of DEFR to the more challenging 1060 nm wavelength region is demonstrated by introducing an additional optical fibre in the sample arm.
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Bernd Hofer, Boris Považay, Angelika Unterhuber, Ling Wang, Boris Hermann, Sara Rey, Gerald Matz, Wolfgang Drexler, "Fast dispersion encoded full range OCT for retinal imaging at 800 nm and 1060 nm", Proc. SPIE 7889, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV, 788907 (15 February 2011); doi: 10.1117/12.874527; https://doi.org/10.1117/12.874527
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