  We propose a novel OCT-based method for visualizing microvasculature in 3D
using reference-free processing of individual complex-valued B-scans with
highly overlapped A-scans. In the lateral direction of such a B-scan, the
amplitude and phase of speckles corresponding to vessel regions exhibit faster
variability, and thus can be detected without comparison with other B-scans
recorded in the same plane. This method combines elements of several existing
OCT angiographic approaches, and exhibits: (i) enhanced robustness with respect
to bulk tissue motion with frequencies up to tens of Hz; (ii) resolution of
microcirculation images equal to that of structural images and (iii)
possibility of quantifying the vessels in terms of their decorrelation rates.
