Radiofrequency electrode vibration-induced shear wave imaging for tissue modulus estimation: A simulation study
Temporal progression of the shear wave at different positions in the model lateral to the ROE. Young’s modulus of inclusion is 100 kPa.
The TTP displacement of the shear wave at each pixel plotted against the lateral position of that pixel for inclusion modulus of 100 kPa. The inverse slope of this line corresponds to the velocity of the shear wave.
The change of slope in the TTP displacement line is indicative of the boundary between the inclusion and the background, i.e., a change in the Young’s modulus of the underlying propagation medium.
The estimated inclusion modulus for the different inclusion moduli simulated are plotted against the actual moduli. The bold line represents the estimated values while the dotted line represents the actual values. The deviation of the bold line from the dotted line indicates the errors in the estimation procedure.
The TTP displacement trend for image pixels laterally offset from the ROE. The bold curve represents the inclusion with Young’s modulus 10 kPa and the dotted curve represents the inclusion with Young’s modulus 100 kPa. This figure illustrates that shear wave propagation is faster when the underlying inclusion modulus is higher.
The table presents results from the modulus estimation procedure, for all the different inclusion and background moduli simulated.
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