Influence of automated disc margin determination on Stratus OCT optic nerve head measurements

André Soares de Camargo, Luiz Alberto Soares Melo Jr, Flavio Eduardo Hirai, Ivan Maynart Tavares Glaucoma Service, Department of Ophthalmology and Visual Sciences, Federal University of São Paulo, Paulista Medical School, São Paulo, Brazil Purpose: To analyze the i...

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Autores principales:	Soares de Camargo A, Melo LA Jr, Hirai FE, Tavares IM
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2014
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/51428c5bf00840a590eef3459e606366
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spelling	oai:doaj.org-article:51428c5bf00840a590eef3459e6063662021-12-02T06:17:00ZInfluence of automated disc margin determination on Stratus OCT optic nerve head measurements1177-5483https://doaj.org/article/51428c5bf00840a590eef3459e6063662014-03-01T00:00:00Zhttp://www.dovepress.com/influence-of-automated-disc-margin-determination-on-stratus-oct-optic--a16001https://doaj.org/toc/1177-5483 André Soares de Camargo, Luiz Alberto Soares Melo Jr, Flavio Eduardo Hirai, Ivan Maynart Tavares Glaucoma Service, Department of Ophthalmology and Visual Sciences, Federal University of São Paulo, Paulista Medical School, São Paulo, Brazil Purpose: To analyze the influence of manual correction of the automatically determined edge of the optic nerve head (ONH) in optic disc measurements in cases in which the optical coherence tomography did not identify the disc limits correctly. Methods: The study included 127 eyes from 127 consecutive patients with glaucoma, suspects, and healthy individuals. In a retrospective analysis, eyes that underwent testing with the Stratus OCT (software version 4.0, Carl Zeiss Meditec, Dublin, CA, USA) Fast Optic Disc protocol were evaluated. Forty-seven eyes in which either the manual assignment was not necessary or the signal strength was below six were excluded. After image acquisition and processing, one expert examiner manually corrected the determination of the edge of the ONH, identified as the end of the retinal pigment epithelium/choriocapillaris complex. Disc area, cup area, rim area, and cup/disc area ratio results were compared before and after the optic disc margin manually corrected determination. Paired t-test was performed to evaluate the differences, and Bland–Altman plots were used to display the relationships between measurements. Results: Eighty eyes from 80 individuals were included in the analyses. No statistically significant difference (P=0.538) was found when analyzing results obtained with automated and manual determination of rim area (mean ± standard deviation; 1.30±0.45 mm2 and 1.29±0.39 mm2, respectively). Cup area (1.39±0.58 mm2 and 1.31±0.55 mm2, respectively), cup/disc area ratio (0.50±0.16 mm2 and 0.49±0.15 mm2, respectively), and disc area results (2.69±0.55 mm2 and 2.60±0.51 mm2, respectively) were significantly different. Conclusion: The Stratus OCT ONH Report results were little influenced when optic disc limits were manually determined. Therefore the standard automated Stratus OCT disc margin assignment is adequate, and manual correction is not necessary. Keywords: optical coherence tomography, optic nerve head, glaucoma, diagnosisSoares de Camargo AMelo LA JrHirai FETavares IMDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2014, Iss default, Pp 493-497 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 Soares de Camargo A Melo LA Jr Hirai FE Tavares IM Influence of automated disc margin determination on Stratus OCT optic nerve head measurements
description	André Soares de Camargo, Luiz Alberto Soares Melo Jr, Flavio Eduardo Hirai, Ivan Maynart Tavares Glaucoma Service, Department of Ophthalmology and Visual Sciences, Federal University of São Paulo, Paulista Medical School, São Paulo, Brazil Purpose: To analyze the influence of manual correction of the automatically determined edge of the optic nerve head (ONH) in optic disc measurements in cases in which the optical coherence tomography did not identify the disc limits correctly. Methods: The study included 127 eyes from 127 consecutive patients with glaucoma, suspects, and healthy individuals. In a retrospective analysis, eyes that underwent testing with the Stratus OCT (software version 4.0, Carl Zeiss Meditec, Dublin, CA, USA) Fast Optic Disc protocol were evaluated. Forty-seven eyes in which either the manual assignment was not necessary or the signal strength was below six were excluded. After image acquisition and processing, one expert examiner manually corrected the determination of the edge of the ONH, identified as the end of the retinal pigment epithelium/choriocapillaris complex. Disc area, cup area, rim area, and cup/disc area ratio results were compared before and after the optic disc margin manually corrected determination. Paired t-test was performed to evaluate the differences, and Bland–Altman plots were used to display the relationships between measurements. Results: Eighty eyes from 80 individuals were included in the analyses. No statistically significant difference (P=0.538) was found when analyzing results obtained with automated and manual determination of rim area (mean ± standard deviation; 1.30±0.45 mm2 and 1.29±0.39 mm2, respectively). Cup area (1.39±0.58 mm2 and 1.31±0.55 mm2, respectively), cup/disc area ratio (0.50±0.16 mm2 and 0.49±0.15 mm2, respectively), and disc area results (2.69±0.55 mm2 and 2.60±0.51 mm2, respectively) were significantly different. Conclusion: The Stratus OCT ONH Report results were little influenced when optic disc limits were manually determined. Therefore the standard automated Stratus OCT disc margin assignment is adequate, and manual correction is not necessary. Keywords: optical coherence tomography, optic nerve head, glaucoma, diagnosis
format	article
author	Soares de Camargo A Melo LA Jr Hirai FE Tavares IM
author_facet	Soares de Camargo A Melo LA Jr Hirai FE Tavares IM
author_sort	Soares de Camargo A
title	Influence of automated disc margin determination on Stratus OCT optic nerve head measurements
title_short	Influence of automated disc margin determination on Stratus OCT optic nerve head measurements
title_full	Influence of automated disc margin determination on Stratus OCT optic nerve head measurements
title_fullStr	Influence of automated disc margin determination on Stratus OCT optic nerve head measurements
title_full_unstemmed	Influence of automated disc margin determination on Stratus OCT optic nerve head measurements
title_sort	influence of automated disc margin determination on stratus oct optic nerve head measurements
publisher	Dove Medical Press
publishDate	2014
url	https://doaj.org/article/51428c5bf00840a590eef3459e606366
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Influence of automated disc margin determination on Stratus OCT optic nerve head measurements

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