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. 2019 Feb 22;14(2):e0212563. doi: 10.1371/journal.pone.0212563

Fig 2. Protocol of image analysis.

Fig 2

The OCT fundus image (A) was used to assist manual delineation of the geographic atrophy (GA) region. The compensated choriocapillaris angiogram (B) was thresholded in order to obtain a binarized picture where the black pixels represent the signal voids in the choriocapillaris flow (C). The percentage of flow voids was calculated outside the atrophy (D), within two concentric 500 μm wide regions surrounding the GA (para-atrophy region (E) and peri-atrophy region (F).