AUTHOR=Lawali Dan Jouma Amadou Maman , Wu Guanrong , Adam Nouhou Diori , Lin Zhangjie , Kong Huiqian , Yi Liaohui , Fang Ying , Niu Yongyi , Tang Changting , Amza Abdou , Zhang Hongyang , Yu Honghua , Yuan Ling , Hu Yijun 

TITLE=Difference of central foveal thickness measurement in patients with macular edema using optical coherence tomography in different display modes

JOURNAL=Frontiers in Endocrinology

VOLUME=Volume 15 - 2024

YEAR=2024

URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2024.1295745

DOI=10.3389/fendo.2024.1295745

ISSN=1664-2392

ABSTRACT=To assess the differences in the measurement of central foveal thickness (CFT) in patients with macular edema (ME) between the two display modes (1:1 pixel and 1:1 micron) on optical coherence tomography (OCT).Design: This is a retrospective, cross-sectional study.Methods: Group A: participants with well-horizontal OCT B-scan images and Group B: participants with tilted OCT B-scan. We manually measured the CFT under the two display modes, and the values were compared statistically using the paired t-test. Spearman's test was used to assess correlations between the OCT image tilting angle (OCT ITA) and the differences in CFT measurement. The area under the curve (AUC) was calculated to define the OCT ITA cutoff for a defined CFT difference.In group A, the mean CFT in 1:1 pixel display mode was 420.21±130.61 µm, similar to the mean CFT of 415.27±129.85 µm in the 1:1 micron display mode. In group B, the median CFT in 1:1 pixel display mode is 409.00 μm (IQR:171.75 μm), and 368.00 μm (IQR:149.00 μm) in 1:1 micron display mode. There were significant differences between the two display modes with the median (IQR) absolute difference and median (IQR) relative difference of 38.00 μm (75.00 μm) and 10.19% (21.91%) (all p=0.01). The differences in CFT measurement between the two display modes were correlated with the OCT ITA (absolute differences, r = 0.88, p<0.01; relative differences, r = 0.87, p<0.01). The AUC for a pre-defined CFT difference was 0.878 (10 μm), 0.933 (20 μm), 0.938 (30 μm), 0.961 (40 μm), 0.962 (50 μm), and 0.970 (60 μm).In patients with DM, when the OCT B-scan images were well-horizontal, manual CFT measurements under the two display modes were similar, but when the B-scan images were tilted, the CFT measurements were different under the two display modes, and the differences were correlated to the OCT ITA.