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Optimizing the information yield of 3-D OCT in glaucoma
Journal article   Open access   Peer reviewed

Optimizing the information yield of 3-D OCT in glaucoma

Henriët Springelkamp, Kyungmoo Lee, Wishal D Ramdas, Johannes R Vingerling, Albert Hofman, Caroline C W Klaver, Milan Sonka, Michael D Abràmoff and Nomdo M Jansonius
Investigative ophthalmology & visual science, Vol.53(13), pp.8162-8171
12/13/2012
DOI: 10.1167/iovs.12-10551
PMCID: PMC3522440
PMID: 23154462
url
https://doi.org/10.1167/iovs.12-10551View
Published (Version of record) Open Access

Abstract

To determine, first, which regions of 3-D optical coherence tomography (OCT) volumes can be segmented completely in the majority of subjects and, second, the relationship between analyzed area and thickness measurement test-retest variability. Three-dimensional OCT volumes (6 × 6 mm) centered around the fovea and optic nerve head (ONH) of 925 Rotterdam Study participants were analyzed; 44 participants were scanned twice. Volumes were segmented into 10 layers, and we determined the area where all layers could be identified in at least 95% (macula) or 90% (ONH) of subjects. Macular volumes were divided in 2 × 2, 4 × 4, 6 × 6, 8 × 8, or 68 blocks. We placed two circles around the ONH; the ONH had to fit into the smaller circle, and the larger circle had to fit into the segmentable part of the volume. The area between the circles was divided in 3 to 12 segments. We determined the test-retest variability (coefficient of repeatability) of the retinal nerve fiber layer (RNFL) and ganglion cell layer (RGCL) thickness measurements as a function of size of blocks/segments. Eighty-two percent of the macular volume could be segmented in at least 95% of subjects; for the ONH, this was 65% in at least 90%. The radii of the circles were 1.03 and 1.84 mm. Depending on the analyzed area, median test-retest variability ranged from 8% to 15% for macular RNFL, 11% to 22% for macular RGCL, 5% to 11% for the two together, and 18% to 22% for ONH RNFL. Test-retest variability hampers a detailed analysis of 3-D OCT data. Combined macular RNFL and RGCL thickness averaged over larger areas had the best test-retest variability.
 Algorithms Reproducibility of Results Intraocular Pressure Tomography, Optical Coherence Humans Middle Aged Glaucoma, Open-Angle - diagnosis Fovea Centralis - pathology Male Retinal Ganglion Cells - pathology Axons - pathology Female Imaging, Three-Dimensional Optic Disk - pathology

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