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Optics Express

Optics Express

  • Vol. 17, Iss. 7 — Mar. 30, 2009
  • pp: 5039–5051

Synthetic wavelength based phase unwrapping in spectral domain optical coherence tomography

Hansford C. Hendargo, Mingtao Zhao, Neal Shepherd, and Joseph A. Izatt  »View Author Affiliations


Optics Express, Vol. 17, Issue 7, pp. 5039-5051 (2009)
http://dx.doi.org/10.1364/OE.17.005039


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Abstract

Phase sensing implementations of spectral domain optical coherence tomography (SDOCT) have demonstrated the ability to measure nanometer-scale temporal and spatial profiles of samples. However, the phase information suffers from a 2π ambiguity that limits observations of larger sample displacements to lengths less than half the source center wavelength. We introduce a synthetic wavelength phase unwrapping technique in SDOCT that uses spectral windowing and corrects the 2π ambiguity, providing accurate measurements of sample motion with information gained from standard SDOCT processing. We demonstrate this technique by using a common path implementation of SDOCT and correctly measure phase profiles from a phantom phase object and human epithelial cheek cells which produce multiple wrapping artifacts. Using a synthetic wavelength for phase unwrapping could prove useful in Doppler or other phase based implementations of OCT.

© 2009 Optical Society of America

OCIS Codes
(100.5070) Image processing : Phase retrieval
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(170.4500) Medical optics and biotechnology : Optical coherence tomography

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: January 27, 2009
Revised Manuscript: March 7, 2009
Manuscript Accepted: March 10, 2009
Published: March 16, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Hansford C. Hendargo, Mingtao Zhao, Neal Shepherd, and Joseph A. Izatt, "Synthetic wavelength based phase unwrapping in spectral domain optical coherence tomography," Opt. Express 17, 5039-5051 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-7-5039


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