Figure 3.

The definitions and mathematical measurements used to calculate the taper ratio (TR), oversizing ratio (OR) and mismatch rate (MR) after TEVAR. Post-TR = 1−(A_DLZ’/A_PLZ’); Post-OR = (A_SG’/A_DLZ)−1; Post-MR = D_SG/D_DLZ’.

Notes: (A) VR reconstruction images from the same patient affected by TBAD. (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 distal TL area (A_DLZ’) and maximal diameter (D_DLZ’) of the TL of the partially expanded stent.

Abbreviations: TEVAR, thoracic endovascular aortic repair; DLZ, distal landing zone; PLZ, Proximal landing zone; TL, true lumen; A_SG’, the distal area of the partially expanded stent graft; D_SG, the distal diameter of the selected stent graft; A _DLZ, is the TL area of the presumed DLZ before TEVAR