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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6761–6776

Common approach for compensation of axial motion artifacts in swept-source OCT and dispersion in Fourier-domain OCT

Dierck Hillmann, Tim Bonin, Christian Lührs, Gesa Franke, Martin Hagen-Eggert, Peter Koch, and Gereon Hüttmann  »View Author Affiliations


Optics Express, Vol. 20, Issue 6, pp. 6761-6776 (2012)
http://dx.doi.org/10.1364/OE.20.006761


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Abstract

Swept-source optical coherence tomography (SS-OCT) is sensitive to sample motion during the wavelength sweep, which leads to image blurring and image artifacts. In line-field and full-field SS-OCT parallelization is achieved by using a line or area detector, respectively. Thus, approximately 1000 lines or images at different wavenumbers are acquired. The sweep duration is identically with the acquisition time of a complete B-scan or volume, rendering parallel SS-OCT more sensitive to motion artifacts than scanning OCT. The effect of axial motion on the measured spectra is similar to the effect of non-balanced group velocity dispersion (GVD) in the interferometer arms. It causes the apparent optical path lengths in the sample arm to vary with the wavenumber. Here we propose the cross-correlation of sub-bandwidth reconstructions (CCSBR) as a new algorithm that is capable of detecting and correcting the artifacts induced by axial motion in line-field or full-field SS-OCT as well as GVD mismatch in any Fourier-domain OCT (FD-OCT) setup. By cross-correlating images which were reconstructed from a limited spectral range of the interference signal, a phase error is determined which is used to correct the spectral modulation prior to the calculation of the A-scans. Performance of the algorithm is demonstrated on in vivo full-field SS-OCT images of skin and scanning FD-OCT of skin and retina.

© 2012 OSA

OCIS Codes
(100.3020) Image processing : Image reconstruction-restoration
(110.4500) Imaging systems : Optical coherence tomography

ToC Category:
Image Processing

History
Original Manuscript: November 23, 2011
Revised Manuscript: February 24, 2012
Manuscript Accepted: February 26, 2012
Published: March 8, 2012

Virtual Issues
Vol. 7, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Dierck Hillmann, Tim Bonin, Christian Lührs, Gesa Franke, Martin Hagen-Eggert, Peter Koch, and Gereon Hüttmann, "Common approach for compensation of axial motion artifacts in swept-source OCT and dispersion in Fourier-domain OCT," Opt. Express 20, 6761-6776 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-6-6761


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