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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 5 — Feb. 27, 2012
  • pp: 5368–5383

Gabor fusion technique in a Talbot bands optical coherence tomography system

Petr Bouchal, Adrian Bradu, and Adrian Gh. Podoleanu  »View Author Affiliations


Optics Express, Vol. 20, Issue 5, pp. 5368-5383 (2012)
http://dx.doi.org/10.1364/OE.20.005368


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Abstract

In this paper we show how to advantageously combine two effects to enhance the sensitivity with depth in Fourier domain (FD) optical coherence tomography (OCT): Talbot bands (TB) and Gabor-based fusion (GF) technique. TB operation is achieved by routing the two beams, from the object arm and from the reference arm in the OCT interferometer, along parallel separate paths towards the spectrometer. By adjusting the lateral gap between the two beams in their way towards the spectrometer, the position for the maximum of contrast variation of spectral modulation versus the optical path difference in the interferometer is adjusted. For five values of the focus position, the gap between the two beams is readjusted to reach maximum sensitivity. Then, similar to the procedure employed in the GF technique, a compound image is formed by stitching together the parts of the five images that exhibited maximum brightness. The smaller the diameters of the two beams, the narrower the visibility profile versus depth in Talbot bands, which brings advantages in terms of mirror terms attenuation. However, this leads to a larger spot on the linear camera, which introduces losses, therefore the combined procedure, TB/GF is investigated for four different values of the beam diameters of the two beams. Future cameras with larger pixel size may take full advantage of the TB/GF procedure proposed here.

© 2012 OSA

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
(110.1085) Imaging systems : Adaptive imaging

ToC Category:
Imaging Systems

History
Original Manuscript: December 9, 2011
Revised Manuscript: February 2, 2012
Manuscript Accepted: February 3, 2012
Published: February 21, 2012

Virtual Issues
Vol. 7, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Petr Bouchal, Adrian Bradu, and Adrian Gh. Podoleanu, "Gabor fusion technique in a Talbot bands optical coherence tomography system," Opt. Express 20, 5368-5383 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-5-5368


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