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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 3, Iss. 1 — Jan. 1, 2012
  • pp: 104–124

Phase-sensitive imaging of the outer retina using optical coherence tomography and adaptive optics

Ravi S. Jonnal, Omer P. Kocaoglu, Qiang Wang, Sangyeol Lee, and Donald T. Miller  »View Author Affiliations


Biomedical Optics Express, Vol. 3, Issue 1, pp. 104-124 (2012)
http://dx.doi.org/10.1364/BOE.3.000104


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Abstract

The cone photoreceptor’s outer segment (OS) experiences changes in optical path length, both in response to visible stimuli and as a matter of its daily course of renewal and shedding. These changes are of interest, to quantify function in healthy cells and assess dysfunction in diseased ones. While optical coherence tomography (OCT), combined with adaptive optics (AO), has permitted unprecedented three-dimensional resolution in the living retina, it has not generally been able to measure these OS dynamics, whose scale is smaller than OCT’s axial resolution of a few microns. A possible solution is to take advantage of the phase information encoded in the OCT signal. Phase-sensitive implementations of spectral-domain optical coherence tomography (SD-OCT) have been demonstrated, capable of resolving sample axial displacements much smaller than the imaging wavelength, but these have been limited to ex vivo samples. In this paper we present a novel technique for retrieving phase information from OCT volumes of the outer retina. The key component of our technique is quantification of phase differences within the retina. We provide a quantitative analysis of such phase information and show that–when combined with appropriate methods for filtering and unwrapping–it can improve the sensitivity to OS length change by more than an order of magnitude, down to 45 nm, slightly thicker than a single OS disc. We further show that phase sensitivity drops off with retinal eccentricity, and that the best location for phase imaging is close to the fovea. We apply the technique to the measurement of sub-resolution changes in the OS over matters of hours. Using custom software for registration and tracking, these microscopic changes are monitored in hundreds of cones over time. In two subjects, the OS was found to have average elongation rates of 150 nm/hr, values which agree with our previous findings.

© 2011 OSA

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(100.5070) Image processing : Phase retrieval
(170.0180) Medical optics and biotechnology : Microscopy
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(330.5310) Vision, color, and visual optics : Vision - photoreceptors
(100.3175) Image processing : Interferometric imaging
(100.5088) Image processing : Phase unwrapping

ToC Category:
Optical Coherence Tomography

History
Original Manuscript: September 26, 2011
Revised Manuscript: November 29, 2011
Manuscript Accepted: December 2, 2011
Published: December 13, 2011

Virtual Issues
February 6, 2012 Spotlight on Optics

Citation
Ravi S. Jonnal, Omer P. Kocaoglu, Qiang Wang, Sangyeol Lee, and Donald T. Miller, "Phase-sensitive imaging of the outer retina using optical coherence tomography and adaptive optics," Biomed. Opt. Express 3, 104-124 (2012)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-3-1-104


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