목적: 정상인과 당뇨황반부종(DME)환자에서 시간영역 빛간섭단층촬영기(TD-OCT)와 스펙트럼영역 빛간섭단층촬영기(SD-OCT) 2종을 이용 하여 황반두께를 측정하고 각 기종별 두께 측정치의 차이와 반복성을 알아보았다. 대상과 방법: 정상인 54안과 DME환자 26안을 대상으로 Stratus OCT, Cirrus HD-OCT, Spectralis HRA+OCT를 이용하여 황반두께를 2회 순차적으로 측정한 후 9개의 영역으로 나누어 기기 3종의 측정치를 비교하고 반복성 값을 구하였다. 결과: 반복성은 TD-OCT보다 SD-OCT에서 더 좋았다. 황반두께 측정치는 정상인과 DME환자에서 모두 Spectralis HRA+OCT, Cirrus HD-OCT, Stratus OCT 순으로 높게 측정되었으며, 정상인에서는 기기별로 어떤 조합으로 비교하더라도 9개 영역 모두에서 의미있는 차이가 있었다. 결론: SD-OCT와 TD-OCT 모두 반복성이 뛰어났으나 SD-OCT의 반복성이 더 뛰어난 것으로 나타났다. 기종간의 측정부위가 다르며 측정치가 조금씩 다르므로 검사 결과를 해석할 때에 이를 염두에 두어야 할 것으로 생각된다.

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.

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.