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Proceedings Paper

Speckle size in optical Fourier domain imaging
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Paper Abstract

As in conventional time-domain optical coherence tomography (OCT), speckle is inherent to any Optical Fourier Domain Imaging (OFDI) of biological tissue. OFDI is also known as swept-source OCT (SS-OCT). The axial speckle size is mainly determined by the OCT resolution length and the transverse speckle size by the focusing optics illuminating the sample. There is also a contribution from the sample related to the number of scatterers contained within the probed volume. In the OFDI data processing, there is some liberty in selecting the range of wavelengths used and this allows variation in the OCT resolution length. Consequently the probed volume can be varied. By performing measurements on an optical phantom with a controlled density of discrete scatterers and by changing the probed volume with different range of wavelengths in the OFDI data processing, there is an obvious change in the axial speckle size, but we show that there is also a less obvious variation in the transverse speckle size. This work contributes to a better understanding of speckle in OCT.

Paper Details

Date Published: 26 October 2007
PDF: 7 pages
Proc. SPIE 6796, Photonics North 2007, 67960I (26 October 2007);
Show Author Affiliations
G. Lamouche, National Research Council Canada (Canada)
S. Vergnole, National Research Council Canada (Canada)
C-E. Bisaillon, National Research Council Canada (Canada)
Ecole Polytechnique de Montréal (Canada)
M. Dufour, National Research Council Canada (Canada)
R. Maciejko, Ecole Polytechnique de Montréal (Canada)
J-P. Monchalin, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 6796:
Photonics North 2007
John Armitage, Editor(s)

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