**2.4 Computed tomography**

In preprocedural evaluations of patients with AR, ECG-gated CT is indispensable because it provides precise information about the aortic size and valve morphology, among other vital details, for optimal procedural planning. Additionally, CT can help exclude the presence of associated coronary artery disease. It is worth noting that the asymmetrical nature of the aortic root, especially in cases of a bicuspid aortic valve, can lead to underestimation of the actual size of the aortic valve when measured using single-plane echocardiography.
