Techniques for extraction of depth-resolved in vivo human retinal intrinsic optical signals with optical coherence tomography

Tumlinson, Alexandre Rex, Hermann, Boris ORCID: https://orcid.org/0000-0001-8658-485X, Hofer, Bernd, Povazay, Boris, Margrain, Thomas Hengist ORCID: https://orcid.org/0000-0003-1280-0809, Binns, Alison and Drexler, Wolfgang 2009. Techniques for extraction of depth-resolved in vivo human retinal intrinsic optical signals with optical coherence tomography. Japanese Journal of Ophthalmology 53 (4) , pp. 315-326. 10.1007/s10384-009-0684-5

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Abstract

Purpose To demonstrate acquisition and analysis methods for depth-resolved observation of slow retinal physiology induced changes in infrared backscatter in vivo. Methods A dark-adapted human was briefly subjected to a localized photobleach. For 20 min before and 30 min after the stimulus, volumetric optical coherence tomograms were collected partially overlapping the bleached region. Tomograms were segmented into retinal layers by a newly described algorithm exploiting information in adjacent B-scans. En face fundus images extracted from major intraretinal layers were laterally registered manually. Time series summarizing the observed backscatter in selected layers for the bleached and unbleached areas are shown with a variety of corrections and normalizations applied: tomograms were corrected for inherent sensitivity roll-off, and the ratio between other layers and an assumed unchanging layer (retinal pigment epithelium), as well as the ratio of the stimulated area to the unstimulated area, were calculated. Results Adjacent B-scan information allows a simpler segmentation algorithm to be used. Sensitivity roll-off correction reduces signal variability due to eye motion. After normalizations, the signal correlated with the stimulus appears strongest at the photoreceptor inner-outer segment junction. Conclusions Demonstrated methods manage data complexity and reduce uncorrelated signal variability. This single trial warrants further investigation of intrinsic optical signals to observe slow physiologic responses.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Optometry and Vision Sciences
Subjects:	R Medicine > RE Ophthalmology
Uncontrolled Keywords:	functional - intrinsic optical signal - optical coherence tomography (OCT) - optophysiology - segmentation
Publisher:	Springer
ISSN:	0021-5155
Last Modified:	18 Oct 2022 14:24
URI:	https://orca.cardiff.ac.uk/id/eprint/17381

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