Fig. 25

A 76-year-old female with severe aortic stenosis assessed for potential implantation of a Medtronic CoreValve. Aortic diameter 4 cm above the plane of the aortic annulus is crucial: diameter >4.3 cm may prevent even the largest device from successfully anchoring. The 3D volume-rendered images provide landmarks to display the sites of subsequent measurements of the ascending aortic luminal diameter (a). This area is carefully measured using a centreline approach (b) with subsequent luminal measurements made in a plane orthogonal to the vessel (c)