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Figure 1 Regional strain analysis with MR tagging. By means of MR tagging along the cardiac short and long axes, the LV wall is divided in 32 small cuboids (three-dimensional [3D] reconstruction). Each cuboid is defined by four epicardial and four endocardial node points. The strains are expressed in a local cardiac coordinate system for each epicardial and endocardial node point. The axes are radial (R), circumferential (C) and longitudinal (L).