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S. kim, J. Oh, J.-H. Park, S.-W. Kim, J.-H. Oh, K. Huh; Error in Retinal Thickness Compare Map of Spectral Domain Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2010;51(13):4400.
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© ARVO (1962-2015); The Authors (2016-present)
To describe the rate and characteristics of errors in retinal thickness compare map of spectral domain optical coherence tomography (OCT) scans.
We retrospectively analyzed the compare map of OCT scans of patients who were imaged 2 or more times using Topcon 3D-OCT-1000.
One hundred sixty-five patients with compare map were included. Ninety-three compare maps were derived from patients with the two scans obtained at the same day and 72 were not. Errors were detected in 121 (57%) of the 165 compare maps. Time interval between two scans comprising compare map did not influence the incidence of error. Errors were classified to fixation error (8%) from fixation loss during the each scanning, matching error (23%) from mismatching of the centers of the two scans, and segmentation error (26%). Fixation error was characterized by horizontal line on the compare map. Matching error was noted by two symmetric configurations on the map. Compare maps with segmentation error showed abrupt localized change of thickness.
Errors on compare map occur frequently with current segmentation and matching algorithms. They can be noticed with their characteristic configuration.
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