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Figure 9 Quantitation of torsion and torsion velocity (rate) by speckle tracking imaging. Images to the left represent cross-sectional views of the base and the apex of the left ventricle superimposed with speckle tracking imaging-generated markers of left ventricular torsion. Images to the right represent torsion rate and torsion signal. Arrowhead and arrow mark peak negative torsion velocity and peak systolic torsion, respectively.