Fig. 1.

(a) Typical light propagation in a macrovessel (top) and a capillary (bottom); (b) left: en face MIP (over $\sim 200\mu \mathrm{m}$ in $Z$) of regular OCTA obtained after averaging 20 images; right: $XZ$ cross-sectional image shows the “tail” artifacts in axial direction; and (c) $g_1(\tau )$ with time lags spanning 4 ms showing the decorrelation at selected positions (black, above vessel; red, inside vessel; and magenta, beneath vessel); top: $g_1(\tau )$ decorrelation for the large vein marked in (b); bottom: $g_1(\tau )$ decorrelation for the capillary marked in (b).