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Proceedings Paper

Fast dispersion encoded full range OCT for retinal imaging at 800 nm and 1060 nm
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Paper 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.

Paper Details

Date Published: 15 February 2011
PDF: 7 pages
Proc. SPIE 7889, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV, 788907 (15 February 2011); doi: 10.1117/12.874527
Show Author Affiliations
Bernd Hofer, Medical Univ. Vienna (Austria)
Boris Považay, Medical Univ. Vienna (Austria)
Angelika Unterhuber, Medical Univ. Vienna (Austria)
Ling Wang, Cardiff Univ. (United Kingdom)
Boris Hermann, Medical Univ. Vienna (Austria)
Sara Rey, Cardiff Univ. (United Kingdom)
Gerald Matz, Vienna Univ. of Technology (Austria)
Wolfgang Drexler, Medical Univ. Vienna (Austria)
Cardiff Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7889:
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XV
James G. Fujimoto; Joseph A. Izatt; Valery V. Tuchin, Editor(s)

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