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Figure 2 (A) Illustration showing the relationship between local strain and tag frequency for harmonic phase-based strain measurements. The contraction of a tagged fiber in the middle would increase the tagging frequency (density of tag lines) as shown in the top fiber. Stretching causes a reduction in local frequency. (B) Two-dimensional segmentation of the heart and mesh generation (top panel) and regional strain versus time plots over the cardiac cycle; (C) complete regional strain versus time plots over the cardiac cycle for all segments. ECC = circumferential strain.
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