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J Biophotonics. 2018 Aug;11(8):e201800070. doi: 10.1002/jbio.201800070. Epub 2018 Jul 13.

Label-free volumetric imaging of conjunctival collecting lymphatics ex vivo by optical coherence tomography lymphangiography.

Author information

1
Optical+Biomedical Engineering Laboratory, Department of Electrical, Electronic and Computer Engineering, The University of Western Australia, Perth, WA, Australia.
2
Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, WA, Australia.
3
Lions Eye Institute, Nedlands, WA, Australia.
4
Biomedical Optics Research Group, School of Engineering Science, Simon Fraser University, Burnaby, BC, Canada.
5
University of Surrey, Guildford, Surrey, UK.

Abstract

We employ optical coherence tomography (OCT) and optical coherence microscopy (OCM) to study conjunctival lymphatics in porcine eyes ex vivo. This study is a precursor to the development of in vivo imaging of the collecting lymphatics for potentially guiding and monitoring glaucoma filtration surgery. OCT scans at 1300 nm and higher-resolution OCM scans at 785 nm reveal the lymphatic vessels via their optical transparency. Equivalent signal characteristics are also observed from blood vessels largely free of blood (and devoid of flow) in the ex vivo conjunctiva. In our lymphangiography, vessel networks were segmented by compensating the depth attenuation in the volumetric OCT/OCM signal, projecting the minimum intensity in two dimensions and thresholding to generate a three-dimensional vessel volume. Vessel segmentation from multiple locations of a range of porcine eyes (n = 21) enables visualization of the vessel networks and indicates the varying spatial distribution of patent lymphatics. Such visualization provides a new tool to investigate conjunctival vessels in tissue ex vivo without need for histological tissue processing and a valuable reference on vessel morphology for the in vivo label-free imaging studies of lymphatics to follow.

KEYWORDS:

aqueous veins; blood vessels; conjunctiva; glaucoma; lymphangiography; lymphatics; optical coherence tomography; speckle decorrelation

PMID:
29920959
DOI:
10.1002/jbio.201800070

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