Aortic root dimensions were measured using CMR (1.5 Tesla, Achieva, Philips, the Netherlands) and DSCT (Definition, Siemens, Erlangen, Germany) in 58 patients referred for evaluation of TAVI. For CMR non-contrast enhanced navigator-gated 3-D whole heart acquisition was conducted (voxel size 1.2x1.2x1.8, TR/TE 4.9/2.9, flip angle 100°). CMR-images were analyzed using a 3-D reconstruction tool (EWS, Philips, the Netherlands). Coronal and sagittal CT-images were reconstructed for evaluation of aortic annulus and ascending aorta dimensions at an external workstation. The TAVI strategy (choice of prosthesis size and decision to implant) was based on 2D-TEE annulus measurements.