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Figure 2: Methods of determination of LVO diameter. 2D ascending aorta dimensions are inner wall dimensions. 2D aortic annulus dimensions are taken at the valve hinges. Trailing edge technique measures the inner diameter of a vessel in M mode from the posterior portion of the anterior aortic wall to the inner boundary of the posterior aortic wall. Leading edge technique measures from the anterior portion of the anterior aortic wall to the inner boundary of the posterior aortic wall.