exciting an ultrasound probe to transmit ultrasound waves to a body tissue under examination and receive ultrasound echoes to obtain a first ultrasound echo signal, wherein the ultrasound probe comprises an ultrasound transducer provided with multiple array elements;

obtaining an ultrasound image of the body tissue under examination according to the first ultrasound echo signal;

generating a shear wave in the body tissue under examination;

exciting a portion of the array elements of the ultrasound transducer to transmit ultrasound waves and control an excitation time of the portion of the array elements such that the ultrasound waves transmitted by the portion of the array elements form a first unfocused ultrasound beam covering a first region in the body tissue under examination, wherein the shear wave propagates at least partially in the first region, and the first unfocused ultrasound beam tracks a propagation process of the shear wave in the first region;

receiving ultrasound echoes from the first region to obtain second ultrasound echo signals;

performing correlation calculation on the second ultrasound echo signals obtained at different times to obtain a first propagation path of the shear wave in the first region;

exciting the portion of the array elements of the ultrasound transducer to transmit ultrasound waves and control an excitation time of the portion of the array elements such that the ultrasound waves transmitted by the portion of the array elements form a second unfocused ultrasound beam covering a second region in the body tissue under examination, wherein the shear wave propagates at least partially in the second region, and the second unfocused ultrasound beam tracks a propagation process of the shear wave in the second region, wherein the first region in the body tissue under examination has a first area and the second region in the body tissue under examination has a second area, wherein the second region is different from the first region and at least partially overlaps with the first region, and the first region and the second region form a two-dimensional region;

receiving ultrasound echoes from the second region to obtain third ultrasound echo signals;

performing correlation calculation on the third ultrasound echo signals obtained at different times to obtain a second propagation path of the shear wave in the second region; and

simultaneously displaying, by a display device, the ultrasound image, the first propagation path, and the second propagation path.