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. Author manuscript; available in PMC: 2019 Mar 7.
Published in final edited form as: Prog Retin Eye Res. 2017 Dec 8;64:1–55. doi: 10.1016/j.preteyeres.2017.11.003

Fig. 23.

Fig. 23.

Segmentation errors. Example showing segmentation error in a patient with high myopia. The en face OCTA image (top) shows blood vessels of many different sizes. The upper left does not appear to show any flow. (Bottom) The segmentation contours, shown in a B-scan with a flow overlay, exhibits serious errors. The segmentation contour was intended to be the choriocapillaris but deviates into the choroid, sclera and is outside of the eye entirely (left side). This produces the black area in the upper left corner of the en face OCTA image because the image contains information from the wrong depth. Segmentation errors can cause severe errors in interpretation. The risk of errors can be reduced by viewing cross sectional images to confirm the integrity of the en face projection images.