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Principle of 3D speckle-tracking strain measurement. (A) shows a 3D full volume of the left ventricle, in which a 17-segment ROI has been generated from the endocardial and epicardial meshes; (B) shows the principle of “block-matching”, in which specific 3D patterns of natural acoustic markers are tracked from end-diastole (blue cube) to end-systole (red cube).
