The Comparison of Macular Thickness Measurements and Repeatabilities Between Time Domain and Spectral Domain OCT. |
Sung Woon Moon, Eung Suk Kim, Young Gyun Kim, Seung Young Yoo, Hyung Woo Kwak |
1Department of Ophthalmology, Medical College of Kyung Hee University, Seoul, Korea. syyu@khu.ac.kr 2Department of Ophthalmology, Medical College of Chung-Ang University, Seoul, Korea. |
시간영역과 스펙트럼영역 빛간섭단층촬영기의 황반두께 측정치 및 반복성의 비교 |
문성운1ㆍ김응석2ㆍ김영균1ㆍ유승영1ㆍ곽형우1 |
Department of Ophthalmology, Medical Collage of Kyung Hee University1, Seoul, Korea / Department of Ophthalmology, Medical Collage of Chung-Ang University2, Seoul, Korea |
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Abstract |
PURPOSE To compare macular thickness measurements obtained from time domain optical coherence tomography (TD-OCT) and 2 spectral domain (SD) OCTs and to evaluate their repeatability and agreement in normal subjects and diabetic macular edema patients. METHODS: Fifty-four healthy, normal subjects and 26 diabetic macular edema patients were participated in this study. In a randomly selected eye from each subject, two serial macular measurements were obtained from TD-OCT (Stratus OCT) and SD-OCTs (Cirrus HD-OCT, Spectralis HRA+OCT) by an experienced technician in random order. Nine areas of macular thickness map and repeatabilities obtained by the 3 OCTs were compared. RESULTS: In relative repeatability, SD-OCT showed better results overall compared to TD-OCT. Macular thickness was greatest in the Spectralis HRA+OCT in both normal subjects and diabetic macular edema patients, followed by Cirrus HD-OCT and Stratus OCT. In normal subjects, regardless of the type of comparison between the machines there was a statistically significant difference in all 9 areas. CONCLUSIONS: While the TD-OCT and the 2 SD-OCTs are reliable for macular thickness measurement, SD-OCT has better measurement repeatability compared with TD-OCT. Because macular measurements obtained from the 3 OCT systems cannot be interchanged, an effort should be made to standardize the measurement of each system. |
Key Words:
Macular thickness measurement;Repeatability;Spectral-domain OCT;Time-domain OCT |
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