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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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The definitions and mathematical measurements of the taper ratio (TR), the oversizing ratio (OR) and the mismatch rate (MR) before TEVAR. Pre-TR = 1−(A_DLZ/A_PLZ); Pre-OR = (A_SG/A_DLZ)−1; Pre-MR = D_SG/D_DLZ.

Notes: (A) VR reconstruction images from a patient affected by TBAD. Measurement of the aorta and TL on two planes: DLZ and PLZ. (B) Axial computed tomography scans obtained in the PLZ plane showing the area (A_PLZ) of the TL. (C) Axial computed tomography scans obtained in the DLZ plane showing the area (A_DLZ) and maximal diameter (D_DLZ) of the TL.

Abbreviations: TEVAR, thoracic endovascular aortic repair; DLZ, distal landing zone; PLZ, proximal landing zone; TL, true lumen; A_SG, distal area of the fully expanded stent graft; D_SG, distal diameter of the selected stent graft.