Abstract
Introduction
Different optical coherence tomography angiography (OCTA) scanning protocols evaluate the macula.
Objective
To compare the determination coefficients (R2) between vessel and perfusion densities of two OCTA scanning protocols in order to determine if their metrics could be interchanged.
Method
Cross-sectional, prospective, comparative, observational, study between two OCTA scanning protocols (Angioplex, Zeiss) in healthy subjects. The R2 between central, inner, and full densities (3 x 3 mm protocol) and between central, inner, outer and full densities (6 x 6 mm protocol) was identified, both for vessel and perfusion densities.
Results
Seventy-eight eyes were evaluated; subjects' median age was 23 years. There were high R2 between inner and full densities with the 3 x 3 mm protocol (0.96), between outer and full densities with the 6 x 6 mm protocol (0.96), and between central vessel and perfusion densities (≥ 0.96); R2 between central vessel and perfusion densities of different protocols was ≤ 0.71.
Conclusions
Vessel and perfusion densities have high determination coefficients within a scanning protocol, but not between protocols, given that each one preferentially measures different macular areas. Metrics from different protocols should not be interchanged for follow up.
Collapse