Jinyu Zhang 1 , Fang Yao Tang 2 , Carol Cheung 2 , Xiaolin Chen 1 , Haoyu Chen Show Affiliations »
Abstract
BACKGROUND: Optical coherence tomography angiography (OCTA) provides not only visualisation but also quantitative measurement of foveal avascular zone (FAZ). Media opacity is common in elderly subjects with cataracts. This study aimed to investigate the impact of media opacity on automated and manual FAZ measurement. METHODS: Cirrus 5000 OCTA and Triton OCTA were used to image FAZ using a 3×3 mm scanning protocol from 30 eyes of 30 healthy normal subjects. Media opacity was simulated with neutral-density filters (optical density (OD): 0.10-0.48 in Cirrus 5000 and 0.15-0.51 in Triton). Signal strength (SS) and signal strength intensity (SSI) were provided by the built-in software in Cirrus 5000 and Triton, respectively. FAZ area, perimeter and circularity were measured automatically using the built-in software as well as a customised MATLAB program. FAZ metrics were also measured manually. The correlations between the OD, SS/SSI and FAZ metrics were analysed using Spearman correlation. RESULTS: Increased OD significantly correlated with decreased SS/SSI (rs =-0.602 and -0.925, respectively, both p<0.001), decreased automated FAZ area (rs =-0.344 and -0.766, respectively, both p<0.001), but increased manual FAZ area in both Cirrus 5000 and Triton (rs =0.423 and 0.543, respectively, both p<0.001). Similar results were found for FAZ perimeter and circularity. There was a positive correlation between SS/SSI with the automated FAZ area but negative correlation with the manual FAZ area. CONCLUSIONS: The effect of media opacity on quantitative measurement of FAZ is different between automated and manual measurements. Cautions must be taken when interpreting FAZ measurement in eyes with media opacity. © Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.
BACKGROUND: Optical coherence tomography angiography (OCTA) provides not only visualisation but also quantitative measurement of foveal avascular zone (FAZ). Media opacity is common in elderly subjects with cataracts . This study aimed to investigate the impact of media opacity on automated and manual FAZ measurement. METHODS: Cirrus 5000 OCTA and Triton OCTA were used to image FAZ using a 3×3 mm scanning protocol from 30 eyes of 30 healthy normal subjects. Media opacity was simulated with neutral-density filters (optical density (OD): 0.10-0.48 in Cirrus 5000 and 0.15-0.51 in Triton). Signal strength (SS) and signal strength intensity (SSI) were provided by the built-in software in Cirrus 5000 and Triton, respectively. FAZ area, perimeter and circularity were measured automatically using the built-in software as well as a customised MATLAB program. FAZ metrics were also measured manually. The correlations between the OD, SS/SSI and FAZ metrics were analysed using Spearman correlation. RESULTS: Increased OD significantly correlated with decreased SS/SSI (rs =-0.602 and -0.925, respectively, both p<0.001), decreased automated FAZ area (rs =-0.344 and -0.766, respectively, both p<0.001), but increased manual FAZ area in both Cirrus 5000 and Triton (rs =0.423 and 0.543, respectively, both p<0.001). Similar results were found for FAZ perimeter and circularity. There was a positive correlation between SS/SSI with the automated FAZ area but negative correlation with the manual FAZ area. CONCLUSIONS: The effect of media opacity on quantitative measurement of FAZ is different between automated and manual measurements. Cautions must be taken when interpreting FAZ measurement in eyes with media opacity. © Author(s) (or their employer(s)) 2021. No commercial re-use. See rights and permissions. Published by BMJ.
Entities: Disease
Keywords:
Angiogenesis; Diagnostic tests/Investigation; Glaucoma; Imaging; Macula; Retina; Trauma
Year: 2020
PMID： 32703785 DOI： 10.1136/bjophthalmol-2019-315780
Source DB: PubMed Journal: Br J Ophthalmol ISSN： 0007-1161 Impact factor: 4.638