Intraobserver and interobserver variation was excellent for the ascending aorta (K=0.85–0.88 and 0.81–0.96, respectively) while the interobserver variation in the transverse arch was good at 0.75.

The subdivision into seven segments seems to be clinically important—the aortic root, the ascending aorta, the ascending aortic arch, the vessel bearing arch, the aortic isthmus, and the thoracic ...