Nonlinear elastic imaging with two-frequency elastic pulse complexes
A pulse complex, non-linear technology, applied in the direction of re-radiation, application, acoustic re-radiation, etc., can solve the problems of image quality reduction, nonlinear scattering signal propagation and scattering parameter extraction
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[0039] Exemplary embodiments according to the present invention will now be described with reference to the accompanying drawings.
[0040] figure 1 a shows a first example of a transmitted pulse complex 101 consisting of a low frequency (LF) pulse 102 and a high frequency (HF) pulse 103 , together with a second example of a pulse complex of LF pulses 105 and HF pulses 106 104. The LF pulse 102 will compress the material at the location of the HF pulse 103, and then the nonlinear elasticity will increase the stiffness of the material, also increasing the propagation velocity observed by the HF pulse 103 along its propagation path. In the second pulse complex 104 , the LF pulse 105 expands the material at the location of the RF pulse 106 , with a subsequent reduction in material hardness and a reduction in the propagation velocity of the RF pulse 106 due to the nonlinear elasticity of the material. For liquids and solids, elasticity can usually be approximated as a quadratic ...
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