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Fig. 1C. —59-year-old healthy male volunteer. Postprocessed image shows tag intersection movement from end-diastole to end-systole () with recalculation of centroid (+) for each image. Analysis of rotation and contraction calculated by subtraction of angle or radius, respectively, at end-diastole and end-systole reveals counterclockwise rotation of 6.9° and radial contraction of 5.1 mm. Mean circumferential shortening calculated from percentual difference between end-diastolic and end-systolic circumference of four segments (boundaries marked by [UNK]) is 25.8%.