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목적 : To determine the long-term repeatability of optical coherence tomography angiography (OCTA) parameters in normal eyes.
방법 : We enrolled 104 normal eyes. Participants were divided into three groups based on differences in the signal strength (SS) of OCTA scans obtained at two visits at least 6 months apart: Group 1, SS difference = 2; group 2, 1; group 3, 0.
Methods: We measured a foveal centered scan area of 3 × 3 mm pattern. All measurements were performed twice at 5 min intervals at the initial visit. The second measurements were performed at least 6 months later.
결과 : In terms of long-term repeatability, the CV was 5.39 - 12.62 % and the ICC was 0.598 - 0.867. Univariate analyses showed that the mean SSs (B, -4.37; P < 0.001) and the difference in SS between measurements (B, 3.38; P < 0.001) significantly affected long-term repeatability. Multivariate analyses showed that the difference in SS was the only significant factor (B, 3.40; P < 0.001). In group 1, the ICCs of the inner and full VDs were 0.194 and 0.221, respectively. In groups 2 and 3, the ICCs of the inner and full VDs were 0.611 and 0.603, and 0.763 and 0.765, respectively.
결론 : OCTA parameters showed good short-term repeatability and reasonable long-term repeatability in normal individuals. The differences in SSs between measurements affected such repeatability, so physicians should query the reliability of OCTA parameters when the differences in SS are 2 or more even when the SS is high.
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