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Proceedings Paper

Optimal processing of Doppler signals in OCT
Author(s): Julia Walther; Lars Kirsten; Edmund Koch
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Paper Abstract

Besides structural imaging, OCT can be used to estimate axial velocities of the sample resolved in depth by Doppler processing. In Fourier domain OCT (FD-OCT), this is accomplished by measuring the phase difference (i.e. phase shift) between timely separated A-scans at the same depth. In most cases, these data are disturbed by noise caused by intrinsic noise of the OCT system, specified by the SNR, and decorrelation noise caused by the transversal movement of the optical beam relative to the sample. Since the first use of Doppler methods in OCT, many methods to reduce the phase shift noise by averaging have been presented. While all these methods use a fixed set of consecutive A-scans, the best method, exhibiting no bias and having the smallest standard deviation, was questionable. Recently, Doppler processing methods depending on the mentioned noise sources and delivering the most likely phase shift and thereby axial velocity became available. The relation of these methods to previously known methods like the Kasai estimator, maximum likelihood estimator (MLE) and joint spectral and time domain OCT (jSTdOCT) will be discussed.

Paper Details

Date Published: 9 July 2015
PDF: 5 pages
Proc. SPIE 9541, Optical Coherence Imaging Techniques and Imaging in Scattering Media, 954102 (9 July 2015); doi: 10.1117/12.2183444
Show Author Affiliations
Julia Walther, Technische Univ. Dresden (Germany)
Lars Kirsten, Technische Univ. Dresden (Germany)
Edmund Koch, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 9541:
Optical Coherence Imaging Techniques and Imaging in Scattering Media
Brett E. Bouma; Maciej Wojtkowski, Editor(s)

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