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Figure 1 Schematic illustration of how strain rate within a tissue segment ({Delta}r) is estimated from the tissue velocity ({nu}). The dashed line indicates orientation of the ultrasound beam. The distance along the beam is denoted r. The strain rate is calculated by subtracting {nu}(r + {Delta}r) from {nu}(r) over the distance ({Delta}r) between these two points. Size of {Delta}r is exaggerated for clarity. l= a given length; {Delta}l = instantaneous change in length.





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