Nonfocused ultrasound waves are produced by merely transmitting long tonebursts on each of several elements in a linear or curved or phased array. This produces an unfocused beam. Shearwave can be imaged by beams from a two-dimensional array if a shearwave is produced in a rectangular section, then the shearwaves can propagate away from the rectangular section and can be imaged. The effect of propagating an unfocused beam that produces multiple shearwaves allows multiple parameters to be varied to make imaging consistent with the desired task. A wide range of parameters can be varied in order to tailor the imaging approach.
Unfocused Shear Wave Elastic ImagingTechnology #2011-002
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