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Segmentation proposed by Kiaser et al. ( 1 ) Aortic sinus (AS). ( 2 ) Sinotubular junction (STJ). ( 3 ) Ascending aorta (AA). ( 4 ) Proximal to the origin of brachiocephalic artery (BCA). ( 5 ) First transverse segment (T1). ( 6 ) Second transverse segment (T2). ( 7 ) Isthmic region (IR). ( 8 ) Descending aorta (DA). ( 9 ) Thoracoabdominal aorta at the level of the diaphragm (D).
