Fig. 6

a Coronal oblique CT image shows the maximal diameters of the sinus (black line) and annulus (white line). The distance from annulus to sinus is also measured. These measurements are essential for determining prosthesis size. Annulus prosthesis mismatch is a common cause of paravalvular leak. b Double-oblique reconstruction at the level of aortic annulus and measurement of minimal and maximal aortic diameters (black lines). These measurements, along with echocardiographic measurements are used in device sizing. c Three-chamber view shows measurement of the LVOT diameter and septal thickness. If the LVOT diameter is small or if the septum is thick, placement of device might be difficult