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. 2020 Aug 17;10:13909. doi: 10.1038/s41598-020-70830-4

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Segmentation of the ascending aorta. “Centerline” of the ascending aorta from the valvular level to the level of the left subclavian artery with the corresponding curved planar reformations (a). Allocation of the ascending aorta into a proximal section, extending from the level of the origin of the most distal coronary artery to the level of the origin of the pulmonary artery bifurcation, and a distal section extending from the pulmonary artery bifurcation to the origin of the brachiocephalic trunk (b). Sections were determined orthogonally to the course of the “centerline”. For segmentation (c), a straight line was drawn through the center of the ascending and corresponding descending aorta at the level of the pulmonary artery bifurcation: (1) the anterior segment covered the sectors 45° on both sides of this straight line in the ventral part of the ascending aorta; (2) the posterior segment included the sectors 45° on both sides in the dorsal part of the ascending aorta. Subsequently, the remaining quarters to the right and to the left of the straight line were termed the (3) right, and the (4) left segment.