Fig. 2

Different steps of anastomosis segmentation. (A) Intermediate steps of initial transverse vessel (TV) segmentation that is inflated in a large graft due to low tissue contrast in the initial contour. (B) Intermediate steps in segmentation of a longitudinal vessel. Two low tissue contrast segments are detected (red and magenta) in the initial TV segmentation to the right in the 1D-tissue contrast analysis (graph below), causing an additional TV segmentation to be added. (C) Intermediate segmentation steps of an. A missing tissue segment is detected at the bottom of the initial TV segment (green). The added TV segmentation allows the extraction of the size of the anastomotic orifice for stenosis quantification