Diabetic Macular Ischemia Diagnosis: Comparison between Optical Coherence Tomography Angiography and Fluorescein Angiography

Figure 3

Quantifying foveal avascular zone (FAZ) area morphology on fluorescein angiography (FA) versus optical coherence tomography angiography (OCTA). Multimodal imaging of a left eye with central nonperfusion. (a) Yellow dotted lines delimits foveal avascular zone (FAZ) area on fluorescein angiography (FA) at 0:34 min. (b) Red dotted lines representing the FAZ area on optical coherence tomography angiography (OCTA) angiogram segmented at the level of the superficial retinal vasculature. (c) An overlap of FAZ areas obtained on FA and OCTA was performed, displaying similarity between the 2 measurements. To obtain centered images, a seed point at the center was used. To delimit FAZ areas in this specific case, the edge points were manually selected along the borders of the vessels, ignoring nearby capillary dropout region.

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