PURPOSE: 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. METHODS: 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. RESULTS: 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. CONCLUSIONS: 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.
PURPOSE: 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. METHODS: 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. RESULTS: 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. CONCLUSIONS: 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.
Authors: Lelia A Paunescu; Joel S Schuman; Lori Lyn Price; Paul C Stark; Siobahn Beaton; Hiroshi Ishikawa; Gadi Wollstein; James G Fujimoto Journal: Invest Ophthalmol Vis Sci Date: 2004-06 Impact factor: 4.799
Authors: Mona K Garvin; Michael D Abràmoff; Kyungmoo Lee; Meindert Niemeijer; Milan Sonka; Young H Kwon Journal: Invest Ophthalmol Vis Sci Date: 2012-01-31 Impact factor: 4.799
Authors: Ji Hyun Kim; Na Rae Kim; Hyunjoong Kim; Eun Suk Lee; Gong Je Seong; Chan Yun Kim Journal: Jpn J Ophthalmol Date: 2011-05-11 Impact factor: 2.447
Authors: J S Schuman; M R Hee; A V Arya; T Pedut-Kloizman; C A Puliafito; J G Fujimoto; E A Swanson Journal: Curr Opin Ophthalmol Date: 1995-04 Impact factor: 3.761
Authors: Donald L Budenz; Robert T Chang; Xiangrun Huang; Robert W Knighton; James M Tielsch Journal: Invest Ophthalmol Vis Sci Date: 2005-07 Impact factor: 4.799
Authors: Albert Hofman; Sarwa Darwish Murad; Cornelia M van Duijn; Oscar H Franco; André Goedegebure; M Arfan Ikram; Caroline C W Klaver; Tamar E C Nijsten; Robin P Peeters; Bruno H Ch Stricker; Henning W Tiemeier; André G Uitterlinden; Meike W Vernooij Journal: Eur J Epidemiol Date: 2013-11-21 Impact factor: 8.082
Authors: Henriët Springelkamp; Kyungmoo Lee; Roger C W Wolfs; Gabriëlle H S Buitendijk; Wishal D Ramdas; Albert Hofman; Johannes R Vingerling; Caroline C W Klaver; Michael D Abràmoff; Nomdo M Jansonius Journal: Invest Ophthalmol Vis Sci Date: 2014-11-20 Impact factor: 4.799