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스펙트럼영역 빛간섭단층촬영기를 이용한 정상인의 황반부 측정치와 측정의 반복성 및 재현성

The Measurements of Macular Thickness and Volume with SD-OCT in Normal Eyes

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초록

목적: 정상인에서 Cirrus HD OCT (optical coherence tomography)를 이용하여 평균 황반두께 및 황반부 용적을 측정하고 그 반복성과재현성을 알아보았다. 대상과 방법: 25명 총 50안을 대상으로 Cirrus HD OCT의 macular cube 512×128 combination scan을 한 명의 검사자가 3회 연속으로시행한 후, 다른 2명의 검사자가 각각 1회씩 추가 시행하였다. 연령, 성별 및 굴절이상과 망막두께와의 관련성을 알아보고, 측정치간의급내상관계수(ICC, Intraclass correlation coefficient)를 분석하여 반복성과 재현성을 평가하였다. 결과: 단일 검사자에 의한 평균 황반두께 및 황반부 부피 측정치간의 ICC는 0.99, 0.96이고, 세 검사자에 의한 측정치간의 ICC는 0.98,0.96이었으며, 9개의 구역별 황반두께 측정치의 ICC도 모두 0.93이상이었다. 연령, 성별 및 굴절이상은 황반두께에 영향을 주었지만반복성과 재현성에 연령, 굴절이상이 미치는 영향은 없었다. 결론: Cirrus HD OCT는 전체 및 구역별 황반두께와 황반부 용적 측정 시에 반복성과 재현성이 모두 뛰어난 결과를 보여 여러 황반부질환의 진단 및 경과 관찰에 유용하게 쓰일 수 있다.

Abstract

Purpose: We investigated reproducibility and repeatability of average macular thickness and volume measurements in normal eyes with Cirrus HD OCT (optical coherence tomography). Methods: Fifty normal eyes from twenty-five subjects without medical and ocular histories were included. Macular cube 512 × 128 combination scanning using the Cirrus HD OCT was performed for a total of three times on the same visit by an experienced technician. Then other two technicians performed one more macular scanning respectively. Within-results,the intraclass correlation coefficient (ICC) was calculated for each parameter studied to evaluate repeatability and reproducibility. The correlation between macular measurements and demographic variables (age, gender, and spherical equivalent) were also investigated. Results: The ICCs for intraoperator reproducibility were 0.99 on the average macular thickness and 0.96 on the macular volume. And the ICCs for interoperator repeatability were found to be 0.98 and 0.96, respectively. The ICCs for measurements of nine regional retinal thickness also were higher than 0.90. The retinal thickness was correlated with age, gender and refractive error. However, neither age nor refractive error affected to reproducibility and repeatability. Conclusions: The retinal thickness and macular volume measurements using Cirrus HD OCT in healthy volunteers showed excellent reproducibility and repeatability. Therefore, Cirrus HD OCT has been recognized as an useful tool for diagnosis and mornitoring of variable maculopathies.

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