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Figure 3 (A) Quantification of local angle displacement of the specific region. A representative apical rotation is shown. Regional angle displacement () was defined by position of a specific tissue element at two different time points and center of the gravity determined by the midmyocardial points. (B) and (C) Profile curve of left ventricular rotation and rotational velocity in a cardiac cycle displayed on the workstation. Left ventricular rotation was calculated from the average of regional points in the midmyocardium (B). Left ventricular rotational velocity was estimated by time-derivation of the left ventricular rotation profile (C). See Figure 2 legend for definitions of ED, ES, red cross, and blue lines.