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Map of out-of-plane strain (Ecc) close to maximum systole (from 300 to 390 ms) (4 frames are shown here). The first image (left) corresponds to the t = 300 ms (after R wave) and with a time step of 30 ms, the last one shows the strain at t = 390 ms. The movie available in the online supporting materials (Additional file 1) helps readers to clearly perceive the results of the method for an extended period of time.
