Yuan Zheng1, Michael Marx1, Rachelle R. Bitton1, and Kim Butts Pauly1
We have demonstrated a method for shear wave
elasticity imaging (SWEI). A shear wave was generated by a short focused
ultrasound (FUS) pulse, and was tracked by collecting images with different
delays (tdelay) between the FUS pulse and bipolar motion-encoding
gradients (MEG). The time-of-flight (TOF) at each pixel was determined by the
zero-crossing of the image phase as a function of tdelay. Based on
the TOF map, a shear wave velocity map was generated in polar coordinates.