Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes

Nicco J Buffolino,1,2 Alexander F Vu,1 Aana Amin,1 Matthew De Niear,1 Susanna S Park1 1Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA; 2University of Nevada-Reno Medical School, Reno, NV, USACorrespondence: Susanna S ParkDepartmen...

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Autores principales:	Buffolino NJ, Vu AF, Amin A, De Niear M, Park SS
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2020
Materias:	foveal avascular zone size deep retinal vascular plexus superficial retinal vascular plexus retinal vasculopathy macular edema Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/e841179b74f8420cb50ae37bb9214015
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spelling	oai:doaj.org-article:e841179b74f8420cb50ae37bb92140152021-12-02T08:42:48ZFactors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes1177-5483https://doaj.org/article/e841179b74f8420cb50ae37bb92140152020-04-01T00:00:00Zhttps://www.dovepress.com/factors-affecting-repeatability-of-foveal-avascular-zone-measurement-u-peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Nicco J Buffolino,1,2 Alexander F Vu,1 Aana Amin,1 Matthew De Niear,1 Susanna S Park1 1Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA; 2University of Nevada-Reno Medical School, Reno, NV, USACorrespondence: Susanna S ParkDepartment of Ophthalmology & Vision Science, University of California Davis Eye Center, 4860 Y Street, Suite 2400, Sacramento, CA 95817, USATel +1 916 734 6074Fax +1 916 734 6197Email sscpark@ucdavis.eduPurpose: To determine factors that may affect the repeatability of the foveal avascular zone (FAZ) measurement obtained using optical coherence tomography angiography (OCTA) including instrument type, image segmentation, image quality, and fundus pathology.Patients and Methods: This prospective single-center study enrolled 43 subjects (85 eyes) with retinal vasculopathy, macular edema, optic pathology or normal contralateral eye. The macula was imaged twice using Optovue Angiovue and once using Cirrus Angioplex to obtain 3x3mm OCTA images centered on the fovea. Images were generated by the same operator within 30 mins. The FAZ size for the entire retinal thickness (“overall FAZ”) was measured automatically using the OCTA software. The FAZ size of the superficial and deep retinal vascular plexus layers was measured manually using the enface OCTA images of the segmented layers and Image J analysis. Intraclass correlations coefficient (ICC) was calculated to determine repeatability.Results: For the overall FAZ measurement, repeatability was excellent (ICC 0.953 right eye, 0.938, left eye) using the same machine (intra-instrument) and somewhat lower but still good to excellent (ICC 0.803 right eye, 0.917 left eye) using machines made by different vendors (inter-instrument). For the segmented layers, intra-instrument repeatability of FAZ measurement was excellent (ICC > 0.95) for both plexus layers. Inter-instrument repeatability was good for the superficial plexus layer (ICC 0.86 right eye, 0.88 left eye) but reduced for the deep plexus layer (ICC 0.63 right eye, 0.57 left eye). Suboptimal image quality and presence of retinal vasculopathy and macular edema tended to reduce FAZ repeatability but to a lesser degree.Conclusion: Inter- and intra-instrument repeatability of the overall FAZ measurement was high using commercial OCTA instruments and only mildly reduced by suboptimal image quality and fundus pathology. For segmented layers, intra-instrument repeatability remained high but inter-instrument repeatability was reduced for the deep plexus layer.Keywords: foveal avascular zone size, deep retinal vascular plexus, superficial retinal vascular plexus, retinal vasculopathy, macular edemaBuffolino NJVu AFAmin ADe Niear MPark SSDove Medical Pressarticlefoveal avascular zone sizedeep retinal vascular plexussuperficial retinal vascular plexusretinal vasculopathymacular edemaOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 14, Pp 1025-1033 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	foveal avascular zone size deep retinal vascular plexus superficial retinal vascular plexus retinal vasculopathy macular edema Ophthalmology RE1-994
spellingShingle	foveal avascular zone size deep retinal vascular plexus superficial retinal vascular plexus retinal vasculopathy macular edema Ophthalmology RE1-994 Buffolino NJ Vu AF Amin A De Niear M Park SS Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes
description	Nicco J Buffolino,1,2 Alexander F Vu,1 Aana Amin,1 Matthew De Niear,1 Susanna S Park1 1Department of Ophthalmology & Vision Science, University of California Davis Eye Center, Sacramento, CA, USA; 2University of Nevada-Reno Medical School, Reno, NV, USACorrespondence: Susanna S ParkDepartment of Ophthalmology & Vision Science, University of California Davis Eye Center, 4860 Y Street, Suite 2400, Sacramento, CA 95817, USATel +1 916 734 6074Fax +1 916 734 6197Email sscpark@ucdavis.eduPurpose: To determine factors that may affect the repeatability of the foveal avascular zone (FAZ) measurement obtained using optical coherence tomography angiography (OCTA) including instrument type, image segmentation, image quality, and fundus pathology.Patients and Methods: This prospective single-center study enrolled 43 subjects (85 eyes) with retinal vasculopathy, macular edema, optic pathology or normal contralateral eye. The macula was imaged twice using Optovue Angiovue and once using Cirrus Angioplex to obtain 3x3mm OCTA images centered on the fovea. Images were generated by the same operator within 30 mins. The FAZ size for the entire retinal thickness (“overall FAZ”) was measured automatically using the OCTA software. The FAZ size of the superficial and deep retinal vascular plexus layers was measured manually using the enface OCTA images of the segmented layers and Image J analysis. Intraclass correlations coefficient (ICC) was calculated to determine repeatability.Results: For the overall FAZ measurement, repeatability was excellent (ICC 0.953 right eye, 0.938, left eye) using the same machine (intra-instrument) and somewhat lower but still good to excellent (ICC 0.803 right eye, 0.917 left eye) using machines made by different vendors (inter-instrument). For the segmented layers, intra-instrument repeatability of FAZ measurement was excellent (ICC > 0.95) for both plexus layers. Inter-instrument repeatability was good for the superficial plexus layer (ICC 0.86 right eye, 0.88 left eye) but reduced for the deep plexus layer (ICC 0.63 right eye, 0.57 left eye). Suboptimal image quality and presence of retinal vasculopathy and macular edema tended to reduce FAZ repeatability but to a lesser degree.Conclusion: Inter- and intra-instrument repeatability of the overall FAZ measurement was high using commercial OCTA instruments and only mildly reduced by suboptimal image quality and fundus pathology. For segmented layers, intra-instrument repeatability remained high but inter-instrument repeatability was reduced for the deep plexus layer.Keywords: foveal avascular zone size, deep retinal vascular plexus, superficial retinal vascular plexus, retinal vasculopathy, macular edema
format	article
author	Buffolino NJ Vu AF Amin A De Niear M Park SS
author_facet	Buffolino NJ Vu AF Amin A De Niear M Park SS
author_sort	Buffolino NJ
title	Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes
title_short	Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes
title_full	Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes
title_fullStr	Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes
title_full_unstemmed	Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes
title_sort	factors affecting repeatability of foveal avascular zone measurement using optical coherence tomography angiography in pathologic eyes
publisher	Dove Medical Press
publishDate	2020
url	https://doaj.org/article/e841179b74f8420cb50ae37bb9214015
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Factors Affecting Repeatability of Foveal Avascular Zone Measurement Using Optical Coherence Tomography Angiography in Pathologic Eyes

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