Viscoelasticity measurement method and ultrasonic imaging system

A viscoelasticity measurement method comprising:

• generating shear waves propagating in a target area of an object to be examined;
• transmitting ultrasonic waves to the target area for tracking the shear waves, and receiving ultrasonic echoes returned from the target area to obtain ultrasonic echo data;
• obtaining tissue motion information in propagation of the shear waves according to the ultrasonic echo data;
• obtaining tissue motion target information corresponding to at least two shear waves of different frequencies from the tissue motion information;
• and
• outputting the tissue motion target information corresponding to the at least two shear waves of different frequencies, the tissue motion target information representing a viscosity characteristic of the target area, comprising:
• generating and displaying a tissue motion image according to the tissue motion target information corresponding to the at least two shear waves of different frequencies, wherein
• one frame of the tissue motion image displays the tissue motion target information corresponding to the at least two shear waves of different frequencies at one or more preset times, wherein the displayed tissue motion target information comprises curves respectively representing propagation positions of the at least two shear waves of different frequencies in a depth direction and a width direction of the object;
• or
• one frame of the tissue motion image displays time information required for the at least two shear waves of different frequencies to propagate to at least one preset propagation position, wherein the displayed time information comprises curves respectively representing propagation positions of the at least two shear waves of different frequencies in the depth direction of the object with respect to time.