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In this study, four-dimensional (3D+t) ultrasound imaging techniques were used for the development and in vivo verification of 3D strain imaging. Two different iterative coarse- to-fine 3D strain estimation methods were developed. One method was based on measuring displacements using 3D kernels and a 3D cross-correlation function. The second method used 2D kernels and cross-correlation, and estimated...
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