Aortic diameters should be measured in 2D-TTE at end-diastole, perpendicular to the long axis of the aorta, using the leading-edge to leading-edge technique for all levels but aortic annulus, for which the inner-to-inner technique should be used.
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References: P. Frasconi et al. Two-Dimensional Aortic Size Normalcy: A Novelty Detection Approach (2020). Manuscript submitted for publication.