Medical ultrasonic imaging technique has been widely used clinically. Unfortunately

the resolution of ultrasonic imaging is much lower than that of X-CT. In order to improve the resolution of ultrasonic imaging

efforts have have made in the field of tissue characterization in past decades. The objective of ultrasonic tissue characterization is to extract characteristic acoustic parameters from the ultrasonic echoes quantitatively

to reconstruct the medical imaging with these parameters

and then to improve the resolution of ultrasonic imaging and the effectiveness of diagnosis. In this article

the basic methods used in the area of ultrasonic tissue characterization is discussed and the progresses on integrated backscatter and elastogram are introduced. Some potential problems for further research are also discussed.