정상안의 유리체황반경계면 평가에 대한 시간영역과 스펙트럼영역 빛간섭단층촬영의 효용성 비교
Comparison of the Efficacy between Time and Spectral Domain Optical Coherence Tomography for the Identification of Vitreomacular Interface
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목적: 시간 및 스펙트럼영역 빛간섭단층촬영기(TD and SD OCT)를 이용하여 정상안에서 유리체황반경계면을 비교하였다. 대상과 방법: 정상 69안(52.7 ± 15.4세)에서 두 OCT로 관찰한 유리체황반경계면을 vitreomacular separation (VMS)이 전혀 없는 군(no VMS), 불완전한 군(incomplete VMS), 구분할 수 없는 군(unknown)으로 분류하였다. 결과: TD OCT에서 no VMS, incomplete VMS, unknown 각각 2안(2.9%), 2안(2.9%), 65안(94.2%)이었고, SD OCT에서 각각 31안(45.0%), 13안(18.8%), 25안(36.2%)이었다. SD OCT에서 no VMS로 분류된 31안 중 29안(93.5%)에서 TD OCT로 unknown군이었다(p˂0.0001). SD OCT에서 incomplete VMS인 13안 중에서 2안(15.4%)에서만 TD OCT로 같은 군이었고, 나머지에서는 unknown군이었다(p˂0.0001). SD OCT에서 unknown 모두에서 TD OCT로 같은 군이었다. 결론: 유리체황반유착이 존재하는 경우에는 SD OCT가 TD OCT보다 유리체황반경계면 평가에 유용하다.
Abstract
Purpose: To compare the efficacy of time domain (TD) and spectral domain (SD) optical coherence tomography (OCT) in determining vitreomacular interface (VMI). Methods: VMIs were evaluated with TD and SD OCT images crossing the fovea horizontally in 69 eyes (mean age 52.7 ±15.4 years) and were classified as follows: (1) no vitreomacular separation (VMS), (2) incomplete VMS, and (3) unknown. Results: In TD OCT, no VMS was observed in 2 eyes (2.9%), incomplete VMS in 2 eyes (2.9%), and unknown in 65 eyes (94.2%). In SD OCT, no VMS was observed in 31 eyes (45.0%), incomplete VMS in 13 eyes (18.8%), and unknown in 25eyes (36.2%). In 31 eyes with no VMS on SD OCT, 29 eyes (93.5%) presented unknown on TD OCT (p<0.0001). In 13eyes with incomplete VMS on SD OCT, 2 eyes (15.4%) showed incomplete VMS and 11 eyes (84.6%) showed unknown on TD OCT (p<0.0001). TD OCT was also non-informative in all 25 eyes with unknown on SD OCT. Conclusions: SD OCT allows better visualization of VMI than TD OCT, especially in patients with no VMS.
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