The position parameters of carotid artery bifurcations (Δx´, Δy´, Δz´). The parameters (Δx´, Δy´, Δz´) were obtained when the position parameters (Δx, Δy, Δz) of the bifurcations of CA were transformed to the parameters in the standardized coordinate system. The bifurcations of the CA were assessed at each bifurcation point. These points were not contained in the orientation parameters. X axes define the parameters of each CA bifurcation points. Y axes define the translation of CA bifurcations in the standardized coordinate system. Patients 1–6 correspond to graphs (a)–(f) in Figures 4, 5, 6. Values are in mm.