Ultrasonography, also known as acoustic imaging, commonly known as enhanced ultrasound, is a technique that can significantly improve the resolution, sensitivity and specificity of ultrasound diagnosis. It has an important significance in the detection and qualitative diagnosis of tumors. Studies have shown that acoustic imaging is superior to conventional ultrasound and Spiral CT in the diagnosis of the number of liver tumors. especially in the detection of sub-centimeter lesions below 1 cm, acoustic imaging can be superior to or at least as sensitive as Spiral CT. Compared with CT and MRI, acoustic imaging possesses more superior features, such as good safety, no allergic reactions, real-time, and relatively low examination cost. It has been seen as the third revolution after 2D ultrasound, Doppler and color flow imaging.