Optical coherence tomography angiography reproducibility of lesion size measurements in neovascular age-related macular degeneration (AMD)

Purpose

To evaluate the reproducibility and interuser agreement of measurements of choroidal neovascularisation in optical coherence tomography angiography (OCTA).

Design

Prospective non-interventional study.

Methods

Consecutive patients, presenting with neovascular age-related macular degeneration (AMD), underwent two sequential OCTA examinations (AngioVue, Optovue, Fremont, California, USA), performed by the same trained examiner. Neovascular lesion area was then measured on both examinations in the choriocapillaris automatic segmentation by two masked readers, using the semiautomated measuring software embedded in the instrument. Two measuring features were used: the first corresponding to the total manually contoured lesion area with the flow draw tool (select area) and the second to the total area of solely vessels with high flow within the lesion (vessel area). These measurements were then compared in order to assess both the reproducibility of OCTA examination and the interuser agreement with the embedded software.

Results

Forty-eight eyes of 46 patients (77.4 mean age,+/-8.2 SD, range from 62 to 95 years old, eight men, 38 women) were included in our study. Mean choroidal neovascularisation area was of 0.72+/-0.7 mm² for the first measurement and 0.75+/-0.76 mm² for the second measurement; difference between the first and the second measurement was 0.03 mm². Intrauser agreement was of 0.98 (CI 0.98 to 0.99) for both 'vessel area' and 'select area' features. Interuser agreement was of 0.98 (CI 0.97 to 0.99) for 'select area' and 'vessel area' features.

Conclusion

Our data suggest that OCTA provide reproducible imaging for evaluation of the neovascular size in the setting of AMD.

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