Fig. 4

Representative examples of the anastomosis segmentations. (Yellow contours = automatic segmentation, green contours = manual segmentation). (A) Good TV segmentation at a heel site, (B) Open \({A_tv}\) with a single TV segmentation, (C) Good \({A_l}\) segmentation. (D) \({A_l}\) with stenosis in the toe detected, (E) \({A_l}\) with lumen overestimation due to low-contrast plaque, (F) TV heel site with underestimation of CA due to close proximity of another vessel, (G) \({A_tv}\) where the size of the anastomotic orifice was extracted (magenta line), (H) TV heel site where the graft is underestimated due to lumen artefacts, (I) \({A_l}\) with underestimation of the graft due to high lumen intensity, (J) A small longitudinal vessel, which is estimated as a missing tissue segment that was not detected during segmentation