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. 2019 Nov 6;14:1925–1935. doi: 10.2147/CIA.S225305

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© 2019 Zha et al.

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Schematic diagram showing the TL, FL and ML area measured directly at the L1, L2 and L3 (dotted lines) levels and the measurements of TI (a/b) and RoC (c/2).

Notes: Level 1: the bronchial bifurcation level; Level 2: the lower edge of the left atrium level; and Level 3: the level of the celiac trunk; a, intra-aorta centerline length between the left subclavian artery and celiac trunk; b, linear distance between the left subclavian artery and celiac trunk; c, distance from the inner wall of the ascending aorta to the inner wall of the descending aorta at the level of the pulmonary artery.

Abbreviations: TL, true lumen; FL, false lumen; ML, maximal lumen; TI, tortuosity index; RoC, radius of curvature.