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Proceedings Paper

Dispersion encoded full range frequency domain OCT
Author(s): Bernd Hofer; Boris Povazay; Boris Hermann; Angelika Unterhuber; Gerald Matz; Wolfgang Drexler
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Paper Abstract

We propose an algorithm that effectively cancels complex conjugate mirror terms from single OCT A-scans by utilizing the dispersion mismatch between reference and sample arm to generate full range tomograms. This allows distinguishing between complex conjugate mirror terms and real structures and is therefore called dispersion encoded full range (DEFR). Whereas the computational complexity is higher, acquisition speed is not compromised since no additional A-scans need to be measured which makes this technique also robust against phase fluctuations. The iterative algorithm uses numeric dispersion compensation and exhibits no reduction in resolution compared to standard processing. Residual leakage of mirror terms is reduced by incorporating further knowledge such as the power spectrum of the light source. The suppression ratio of mirror signals is more than 50 dB and thus comparable to other complex FD-OCT techniques which use more than one A-scan.

Paper Details

Date Published: 20 February 2009
PDF: 8 pages
Proc. SPIE 7168, Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIII, 71681I (20 February 2009); doi: 10.1117/12.809396
Show Author Affiliations
Bernd Hofer, Cardiff Univ. (United Kingdom)
Vienna Univ. of Technology (Austria)
Boris Povazay, Cardiff Univ. (United Kingdom)
Boris Hermann, Cardiff Univ. (United Kingdom)
Angelika Unterhuber, Cardiff Univ. (United Kingdom)
Gerald Matz, Vienna Univ. of Technology (Austria)
Wolfgang Drexler, Cardiff Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7168:
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XIII
James G. Fujimoto; Joseph A. Izatt; Valery V. Tuchin, Editor(s)

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