Generation of Push and Release Shear Waves and Processing Methods for Elasticity Imaging

Technology #2011-210

Multiple short-duration ultrasound push pulses are used to deform tissue. The duration and PRF (Pulse Repetition Frequency) of these push pulses are compatible with current ultrasound scanners because these pulses are comparable to Doppler pulses. The collective effect from many push pulses generates shear waves of high amplitude for elasticity imaging. Two shear waves are produced: one at the beginning and one at the end of the collective push. Both shear waves can be used for elasticity imaging. Two processing methods are disclosed to evaluate the dispersion of shear wave propagation speed. A. 2D FFT of the spatial-time shear wave data. B. 1D FFT of time shear wave data followed by phase regression over spatial axis.