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(A) Position along the centerline of the points (Pi) used to define the cross-sections of the aortic lumen; (B) On each cross-section, original discrete velocity points (Cj) enclosed by the segmentation and within a tolerance (0.51 of a voxel) were projected as (C'j) on the plane (πi) and interpolated. According to the orientation of the cross-section, local reference systems were defined inside the vessel lumen (C) and on the vessel's wall (D).
