Figure 2.

Representative examples of artifacts in OCTA. (A) A macular scan was imaged with/without active eye tracking. Without tracking, complete absence of the signal or breaks within the vessels were induced by eye motion including blinking and saccades, respectively. (B) Deep capillary plexus (DCP) visualization can be affected by the projection of vessels from its superficial vessel plexus (SVP). A projection removal algorithm by subtracting SVP from DCP can resolve the projection artifact and restore the proper visualization of DCP. (C) Low signal area from an unknown blockage origin can confound the real capillary dropout area from OCTA images, but the blockage can also result in a signal loss in their corresponding OCT images. Borrowing the structural information may help to differentiate signal loss area from capillary dropout. (D) Segmentation error occurs more frequently in high myopic eyes with a strong curvature and high optical aberration in periphery. Misinterpretation of the capillary loss can occur when not confirming the segmentation accuracy. OCTA, optical coherence tomography angiography.