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Repeatability of vessel density measurements using optical coherence tomography angiography in retinal diseases
  1. Min-Woo Lee1,
  2. Kyeung-Min Kim1,
  3. Hyung-Bin Lim2,
  4. Young-Joon Jo1,
  5. Jung-Yeul Kim1
  1. 1 Department of Ophthalmology, Chungnam National University College of Medicine, Daejeon, Republic of Korea
  2. 2 Department of Ophthalmology, Armed Forces Capital Hospital, Seongnam, Republic of Korea
  1. Correspondence to Professor Jung-Yeul Kim, Department of Ophthalmology, Chungnam National University Hospital, Daejeon 301-721, Republic of Korea; kimjy{at}cnu.ac.kr

Abstract

Aim To analyse the repeatability of vessel density (VD) measurements using optical coherence tomography angiography (OCTA) in patients with retinal diseases.

Methods Two consecutive VD measurements using OCTA were analysed prospectively in patients with retinal diseases (diabetic macular oedema (DME), retinal vein occlusion (RVO) with macular oedema, epiretinal membrane (ERM), wet age-related macular degeneration (AMD)). The intraclass correlation coefficient (ICC), coefficient of variation (CV) and test-retest SD of VD measurements were assessed, and linear regression analyses were conducted to identify factors related to repeatability.

Results A total of 134 eyes were analysed involving 20 eyes with DME, 44 eyes with RVO with macular oedema, 50 eyes with ERM and 20 eyes with wet AMD. The mean age was 64.9 years, and the mean best-corrected visual acuity (BCVA) was 0.24. The mean central macular thickness (CMT) was 391.6 µm, and the mean ganglion cell-inner plexiform layer (GC-IPL) thickness was 61.4 µm. In all four diseases, the ICC and CV of the full VD were 0.812 and 6.72%, respectively. Univariate analyses showed that the BCVA (B, 8.553; p=0.031), signal strength (B, −1.688; p=0.050), CMT (B, 0.019; p=0.015) and mean GC-IPL thickness (B, −0.103; p=0.001) were significant factors that affected the repeatability. Multivariate analyses of these factors showed a significant result for the GC-IPL thickness.

Conclusions Measurements of the VD using OCTA showed relatively good repeatability for various retinal diseases. The BCVA, signal strength, CMT and GC-IPL thickness affected the repeatability, so these factors should be considered when analysing the VD.

  • repeatability
  • vascular density
  • GC-IPL
  • OCT angiography

This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

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Footnotes

  • Contributors Design and conduct of the study: M-WL, J-YK. Collection of data: M-WL, K-MK, J-YK. Analysis and interpretation of data: M-WL, H-BL, J-YK. Writing the article: M-WL, J-YK. Critical revision of the article: M-WL, Y-JJ, J-YK. Final approval of the article: M-WL, H-BL, K-MK, Y-JJ, J-YK.

  • Competing interests None declared.

  • Patient consent Obtained.

  • Ethics approval Institutional Review Board of Chungnam National University Hospital.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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