Speckle size in optical Fourier domain imaging

G. Lamouche; S. Vergnole; C-E. Bisaillon; M. Dufour; R. Maciejko; J-P. Monchalin

doi:10.1117/12.778506

26 October 2007 Speckle size in optical Fourier domain imaging

G. Lamouche, S. Vergnole, C-E. Bisaillon, M. Dufour, R. Maciejko, J-P. Monchalin

Proceedings Volume 6796, Photonics North 2007; 67960I (2007) https://doi.org/10.1117/12.778506
Event: Photonics North 2007, 2007, Ottawa, Canada

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.

Citation Download Citation

G. Lamouche, S. Vergnole, C-E. Bisaillon, M. Dufour, R. Maciejko, and J-P. Monchalin "Speckle size in optical Fourier domain imaging", Proc. SPIE 6796, Photonics North 2007, 67960I (26 October 2007); https://doi.org/10.1117/12.778506

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KEYWORDS

Speckle

Optical coherence tomography

Data processing

Optical imaging

Optical phantoms

Tissue optics

Silica

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