Fig. 10.

Investigation of the benefits of bulk motion pre-compensation by optimization of the bulk image shifts of the OCT images previous to OCTA processing by SSADA. A En face original OCTA without pre-compensation. B En face OCTA after regression-based bulk motion subtraction from the data set used in A. C Original en face non-thresholded OCTA after inter-B-scan registration. D Result of applying the regression-based bulk motion subtraction on the data set used for C. The residual artifacts still observed in B are better removed in D. E and F are close-ups of the regions enclosed by dashed lines in B and D respectively. Better capillary-background contrast was observed in E. G is a binary vessel mask obtained by imposing a fixed threshold on C while H is obtained by imposing a local regression-based threshold at each segment of a frame. Region enclosed shows that pre-compensation by inter-B-scan registration does not correct the vessel density dependence on local signal strength. Contrastingly, by a regression-based local thresholding a more homogeneous perfusion is identified for the whole scan in H.