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