Imaging the Aortic Annulus with Multi-Detector Computed Tomography and 3-Dimensional Transesophageal Echocardiography

Degenerative aortic stenosis is the most common cause of valvular heart disease in Western nations. Transcatheter aortic valve replacement (TAVR) is an alternative therapy for inoperable or high-risk patients with symptomatic severe aortic stenosis. Three-dimensional imaging techniques provide multiplanar imaging, allowing precise measurements of the noncircular aortic annulus and complex anatomy of the aortic root. These measurements influence patient eligibility, allow adequate prosthesis sizing, and determine the success of implantation and likelihood of complications. This review compares imaging modalities and addresses their strengths and weaknesses to assess the aortic annulus and other aortic root structures.