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Impact of retinal pigment epithelium pathology on spectral‐domain optical coherence tomography‐derived macular thickness and volume metrics and their intersession repeatability
Author(s) -
Hanumunthadu Daren,
Wang Jin Ping,
Chen Wei,
Wong Evan N,
Chen Yi,
Morgan William H,
Patel Praveen J,
Chen Fred K
Publication year - 2017
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1111/ceo.12868
Subject(s) - optical coherence tomography , repeatability , medicine , ophthalmology , retinal , drusen , retinal pigment epithelium , macular degeneration , mathematics , statistics
Background To determine the impact of retinal pigment epithelium (RPE) pathology on intersession repeatability of retinal thickness and volume metrics derived from Spectralis spectral‐domain optical coherence tomography (Heidelberg Engineering, Heidelberg, Germany). Design Prospective cross‐sectional single centre study. Participants A total of 56 eyes of 56 subjects were divided into three groups: (i) normal RPE band (25 eyes); (ii) RPE elevation: macular soft drusen (13 eyes); and (iii) RPE attenuation: geographic atrophy or inherited retinal diseases (18 eyes). Methods Each subject underwent three consecutive follow‐up macular raster scans (61 B‐scans at 119 μm separation) at 1‐month intervals. Main outcome measures Retinal thicknesses and volumes for each zone of the macular subfields before and after manual correction of segmentation error. Coefficients of repeatability (CR) were calculated. Results Mean (range) age was 57 (21–88) years. Mean central subfield thickness (CST) and total macular volume were 264 and 258 μm ( P = 0.62), and 8.0 and 7.8 mm 3 ( P = 0.31), before and after manual correction. Intersession CR (95% confidence interval) for CST and total macular volume were reduced from 40 (38–41) to 8.3 (8.1–8.5) and 0.62 to 0.16 mm 3 after manual correction of segmentation lines. CR for CST were 7.4, 23.5 and 66.7 μm before and 7.0, 10.9 and 7.6 μm after manual correction in groups i, ii and iii. Conclusions Segmentation error in eyes with RPE disease has a significant impact on intersession repeatability of Spectralis spectral‐domain optical coherence tomography macular thickness and volume metrics. Careful examination of each B‐scan and manual adjustment can enhance the utility of quantitative measurement. Improved automated segmentation algorithms are needed.