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Angiograms of the aorta (aortography) during diastole (A) and systole (B). The measurements were taken at the level of the aortic root, sinotubular junction and ascending aorta (red arrows on the A). The systolic aortic stretching (SAS) is the distance in mm that the virtual basal ring is pulled by the heart from diastole (dotted green line on the A) to peak systole (solid green line on the B)
