Figure 1.

Schematic illustration depicting the varying measurement recommendations for CT and TTE at the aortic root and proximal ascending aorta. The American College of Cardiology (ACC) and American Heart Association (AHA) recently revised their measurement guidelines. The 2010 guideline suggested inner edge to inner edge measurement for TTE and external diameter measurement for CT [14,15]. However, the updated 2022 ACC/AHA guideline now recommends leading edge to leading edge measurement in TTE and inner diameter measurements in CT imaging [12] (adapted from Isselbacher, E.M., et al. [12]).