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Utilisation of poor-quality optical coherence tomography scans: adjustment algorithm from the Singapore Epidemiology of Eye Diseases (SEED) study.

Authors :
Thakur, Sahil
Yu, Marco
Yih Chung Tham
Majithia, Shivani
Zhi-Da Soh
Xiao Ling Fang
Cheung, Carol
Pui Yi Boey
Tin Aung
Tien Yin Wong
Ching-Yu Cheng
Source :
British Journal of Ophthalmology; Jul2022, Vol. 106 Issue 7, p962-969, 8p
Publication Year :
2022

Abstract

Purpose To evaluate the effect of signal strength (SS) on optical coherence tomography (OCT) parameters, and devise an algorithm to adjust the effect, when acceptable SS cannot be obtained. Methods 5085 individuals (9582 eyes), aged =40 years from the Singapore Epidemiology of Eye Diseases population-based study were included. Everyone underwent a standardised ocular examination and imaging with Cirrus HD-OCT. Effect of SS was evaluated using multiple structural breaks linear mixed-effect models. Expected change for increment in SS between 4 and 10 for individual parameter was calculated. Subsequently we devised and evaluated an algorithm to adjust OCT parameters to higher SS. Results Average retinal nerve fibre layer (RNFL) thickness showed shift of 4.11 µm from SS of 5 to 6. Above 6, it increased by 1.72 and 3.35 µm to 7 and 8; and by 1.09 µm (per unit increase) above 8 SS. Average ganglion cell-inner plexiform layer (GCIPL) thickness shifted 5.15 µm from SS of 5 to 6. Above 6, increased by 0.94 µm from 7 to 8; and by 0.16 µm (per unit increase) above 8 SS. When compared with reference in an independent test set, the algorithm produced less systemic bias. Algorithm-adjusted average RNFL was 0.549 µm thinner than the reference, while the unadjusted one was 2.841 µm thinner (p<0.001). Algorithm-adjusted and unadjusted average GCIPL was 1.102 µm and 2.228 µm thinner (p<0.001). Conclusions OCT parameters can be adjusted for poor SS using an algorithm. This can potentially assist in diagnosis and monitoring of glaucoma when scans with acceptable SS cannot be acquired from patients in clinics. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00071161
Volume :
106
Issue :
7
Database :
Complementary Index
Journal :
British Journal of Ophthalmology
Publication Type :
Academic Journal
Accession number :
158219860
Full Text :
https://doi.org/10.1136/bjophthalmol-2020-317756