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Errors in thickness comparison maps from 3D optical coherence tomography.

BACKGROUND AND OBJECTIVE
To study characteristics of errors in thickness comparison maps (TCMs) from three-dimensional optical coherence tomography.


PATIENTS AND METHODS
Patients who underwent three-dimensional optical coherence tomography examinations were included. Errors in TCM were categorized into several types according to common features, and the origins and distributions of errors were investigated.


RESULTS
Errors were observed in 25 (22.9%) of 109 TCMs with a normal macula and in 88 (63.3%) of 139 TCMs with an abnormal macula (P < .001). The errors were categorized into three types: horizontal line-shaped errors that originated from fixation loss by the examinee, jumping errors caused by segmentation error, and two-peaked errors due to mismatching. There were significant differences in the distributions of the error types among different diagnoses.


CONCLUSION
Errors in TCM were categorized into several types according to common features. Distributions of these types differed among eyes according to diagnosis.