Background:Exact Assessment of aortic root are important for a patient���s selection and successful transcatheter aortic valve implantation(TAVI).Vascular access site complication remain an important clinical issue.The aim of the study was to estimate the anatomy of the aortic root and iliofemoral artery in korean papulation with severe aortic stenosis(AS) compared to the Western refences and those of patients with TEVAR(thoracic endovascular aortic repair). Methods: The maximal diameter of aortic annulus and annulus-coronary artery ostia distance and aortic valve calcification were measured using coronary MDCT in 14 patients with severe AS. And we have evaluated tortuosity(grades1-4) and calcification(grades1-4) and minimal arterial diameter of iliofemoral artery by peripheral MDCT in 30 patients with severe AS and in 28 patients with TEVAR. Results: The diameter of aortic annulus, aortic valve calcification score and anulus-left, right coronary artery ostia distance in Korean were similar to Western datas(Table 1). Minimal inner diameter of common iliac artery, external iliac artery and common femoral artery in Korean AS patients were similar to Western datas(Table 2). Those were slightly smaller than those in TEVAR.There was no vascular complication in 28 patients with TEVAR (using mean size of stent grafts: 18.5Fr,16-21Fr). Mean size of stent grafts is similar to the size of commercially available TAVI devices(18-22Fr). The degree of tortuosity was lesser in severe AS compared to TEVAR. The degree of calcification were similar between AS and TEVAR. Conclusion: The Datas of aortic root and iliofemoral artery in Korean was similar to western reference. TAVI can be used safely by transfemoral route in patient with severe AS using commercially available TAVI devices in korea as seen in the TEVAR. Also MDCT evaluation of patients referred for TAVI is useful for patient���s selection and successful implantaion.