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Published VersionCC BY-NC-ND V4.0, Open Access
Journal article
Posterior Choroidal Stroma Reduces Accuracy of Automated Segmentation of Outer Choroidal Boundary in Swept Source Optical Coherence Tomography
Investigative Ophthalmology & Visual Science, Vol.59(11), pp.4404-4412
2018
PMID: 30193311
Abstract
PURPOSE. To determine the influence of choroidal boundary morphology on the accuracy of automated measurements of subfoveal choroidal thickness (SECT) in swept source optical coherence tomography (SSOCT).
METHODS. A retrospective image analysis of foveal-centered horizontal line scans from normal and diseased eyes using the Topcon DRI OCT-1 Atlantis SSOCT was conducted. Subfoveal choroid-scleral junction (CSJ) and retina-choroidal junction (RCJ) morphologies were graded by two observers. Automated SECT (A-SECT) was compared with manual SECT (M-SECT) measurements from Bruch's membrane to the posterior limits of choroidal vessel, hyperreflective stroma, and hyporeflective lamina fusca. Agreement in boundary grading was assessed by Cohen's kappa. A-SECT and M-SECT were compared using Bland-Altman analysis and paired Rests.
RESULTS. A total of 200 eyes of 100 patients with a mean (SI)) age of 62 (18) years were included. The choroidal vessel, stromal, and lamina fusca boundaries were visible in 100%, 58%, and 38% of the eyes, respectively. Interobserver agreement in RCJ and CSJ grading was high (kappa = 0.974 and 0.851). Mean A-SFCT differed from M-SFCT by only 2 tun at posterior choroidal vessel boundary (P = 0.801). A-SECT overestimated SECT at the posterior vessel wall boundary by 17 mu m (P = 0.026) and 23 mu m (P = 0.001) in the presence of a visible posterior choroidal stroma and lamina fusca, respectively.
CONCLUSIONS. Automated outer choroidal boundary segmentation tends to identify the posterior limit of the choroidal vessel. Agreement between A-SFCT and M-SFCT is reduced by the presence of posterior stromal layer and lamina fusca. A-SECT should be interpreted with RCJ and CSJ boundary grading.
Details
- Title
- Posterior Choroidal Stroma Reduces Accuracy of Automated Segmentation of Outer Choroidal Boundary in Swept Source Optical Coherence Tomography
- Authors
- Erandi Chandrasekera (Author) - The University of Western AustraliaEvan N. Wong (Author) - The University of Western AustraliaDanuta M. Sampson (Author) - The University of Western AustraliaDavid Alonso-Caneiro (Author) - The University of Western AustraliaFred K. Chen (Corresponding Author) - The University of Western Australia
- Publication details
- Investigative Ophthalmology & Visual Science, Vol.59(11), pp.4404-4412
- Publisher
- Association for Research in Vision and Ophthalmology
- Date published
- 2018
- DOI
- 10.1167/iovs.18-24665
- ISSN
- 1552-5783; 0146-0404
- PMID
- 30193311
- Copyright note
- This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
- Grant note
- APP1054712 / National Health & Medical Research Council
- Organisation Unit
- School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99973594002621
- Output Type
- Journal article
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