목적 : 빛간섭단층촬영을 이용한 망막신경섬유층 분석시 오류의 빈도와 양상을 알아보고자 한다. 대상과 방법 : 빛간섭단층촬영으로 망막신경섬유층을 측정한 179명(338안)을 대상으로 오류의 빈도와 양상 및 오류를 초래할 수 있는 병변을 망막신경섬유층 촬영사진과 비교관찰하였다. 대상안을 오류 유무에 따라 두 군으로 나눈 후 환자연령, 굴절이상 정도, 시신경유두주위위축 및 녹내장의 유무와 형태에 대한 두 군간 차이를 알아보았다. 결과 : 대상환자의 남녀비는 1.37:1, 평균연령 47.6±15.7세, 평균굴절이상 정도는 -1.78±0.23D이었다. 오류는 64안(18.9%)에서 나타났고, 귀쪽 12안(18.8%), 위쪽 51안(79.7%), 코쪽 19안(87.5%), 아래쪽 8안(48.4%) 이었으며, 오류범위의 평균각도는 138° 였다. 오류 유무에 따른 망막병변과 연령 및 녹내장의 유무와 형태는 차이를 보이지 않았으나, 오류가 있는 군에서 시신경유두주위위축이 유의하게 많았고(P<0.005), 근시 정도가 심하였다(P<0.05). 결론 : 빛간섭단층촬영을 이용하여 망막신경섬유층 분석시 오류에 유의해야 하고, 특히 근시와 시신경유두주위위축이 있는 경우 주의를 요한다.

Purpose: To investigate the frequency and characteristics of artifacts which can cause errors in retinal nerve fiber layer analysis using optical coherence tomography (OCT). Methods: The frequency, characteristics and retinal lesions responsible for the artifact were analyzed for 179 patients (338 eyes) by OCT. All images were categorized into two groups according to the presence of artifacts and then, the differences between the two groups were analyzed by t-test and cross-tabulation analysis in terms of age, refractive error, peripapillary atrophic areas, and type of glaucoma. Results: The male to female ratio was 1.37:1, average age was 47.6±15.7 years and average degree of refraction was -1.78±0.23 diopter. Artifacts were noted in 64 eyes (18.9%), and were present in the temporal quadrant in 12 eyes (18.8%), superior quadrant in 51 eyes (79.7%), nasal quadrant in 19 eyes (87.5%), and inferior quadrant in 8 eyes (48.4%). The average angle of the artifact was 138 degrees. Although retinal lesion, age, and glaucoma type were not significantly different between the two groups, peripapillary atrophy and myopia were significantly more common in the group with the artifact. Conclusions: When analyzing retinal nerve fiber layer by OCT, artifacts should be considered, especially in cases of peripapillary atrophy and myopia.

Purpose: To investigate the frequency and characteristics of artifacts which can cause errors in retinal nerve fiber layer analysis using optical coherence tomography (OCT). Methods: The frequency, characteristics and retinal lesions responsible for the artifact were analyzed for 179 patients (338 eyes) by OCT. All images were categorized into two groups according to the presence of artifacts and then, the differences between the two groups were analyzed by t-test and cross-tabulation analysis in terms of age, refractive error, peripapillary atrophic areas, and type of glaucoma. Results: The male to female ratio was 1.37:1, average age was 47.6±15.7 years and average degree of refraction was -1.78±0.23 diopter. Artifacts were noted in 64 eyes (18.9%), and were present in the temporal quadrant in 12 eyes (18.8%), superior quadrant in 51 eyes (79.7%), nasal quadrant in 19 eyes (87.5%), and inferior quadrant in 8 eyes (48.4%). The average angle of the artifact was 138 degrees. Although retinal lesion, age, and glaucoma type were not significantly different between the two groups, peripapillary atrophy and myopia were significantly more common in the group with the artifact. Conclusions: When analyzing retinal nerve fiber layer by OCT, artifacts should be considered, especially in cases of peripapillary atrophy and myopia.