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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 13 — Jun. 20, 2011
  • pp: 12141–12155

Extended focus high-speed swept source OCT with self-reconstructive illumination

Cedric Blatter, Branislav Grajciar, Christoph M. Eigenwillig, Wolfgang Wieser, Benjamin R. Biedermann, Robert Huber, and Rainer A. Leitgeb  »View Author Affiliations


Optics Express, Vol. 19, Issue 13, pp. 12141-12155 (2011)
http://dx.doi.org/10.1364/OE.19.012141


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Abstract

We present a Bessel beam illumination FDOCT setup using a FDML Swept Source at 1300nm with up to 440kHz A-scan rate, and discuss its advantages for structural and functional imaging of highly scattering samples. An extended focus is achieved due to the Bessel beam that preserves its lateral extend over a large depth range. Furthermore, Bessel beams exhibit a self-reconstruction property that allows imaging even behind obstacles such as hairs on skin. Decoupling the illumination from the Gaussian detection increases the global sensitivity and enables dark field imaging. Dark field imaging is useful to avoid strong reflexes from the sample surface that adversely affect the sensitivity due to the limited dynamic range of high speed 8bit acquisition cards. In addition the possibility of contrasting capillaries with high sensitivity is shown, using inter-B-scan speckle variance analysis. We demonstrate intrinsic advantages of the extended focus configuration, in particular the reduction of the phase decorrelation effect below vessels leading to improved axial vessel definition.

© 2011 OSA

OCIS Codes
(110.4500) Imaging systems : Optical coherence tomography
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(280.2490) Remote sensing and sensors : Flow diagnostics
(180.1655) Microscopy : Coherence tomography
(170.2655) Medical optics and biotechnology : Functional monitoring and imaging

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: March 18, 2011
Revised Manuscript: June 5, 2011
Manuscript Accepted: June 6, 2011
Published: June 8, 2011

Virtual Issues
Vol. 6, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Cedric Blatter, Branislav Grajciar, Christoph M. Eigenwillig, Wolfgang Wieser, Benjamin R. Biedermann, Robert Huber, and Rainer A. Leitgeb, "Extended focus high-speed swept source OCT with self-reconstructive illumination," Opt. Express 19, 12141-12155 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-13-12141


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