Ultrasonography injects contrast into a vessel or lumen to enhance the display rate of tiny vessels or organs by enhancing the contrast between the organ and the contrast. These include the following: 1) organ angiography: by enhancing the display rate of organ vessels and surrounding tissues, to show local lesions or plaques in the lumen of vessels, and then determine the benignity or malignancy of lesions or the stability of plaques; 2) tubal ultrasonography: by injecting contrast into the uterine cavity to open the originally closed uterine cavity or fallopian tubes, to determine the degree of tubal patency; 3) gastrointestinal ultrasonography: by using ultrasound contrast to eliminate gas in the gastrointestinal tract, the submucosa of the gastrointestinal wall can be better displayed. 3. Gastrointestinal ultrasonography: the gastrointestinal tract is eliminated by ultrasound contrast, so that the submucosal lesions of the gastrointestinal wall can be better displayed.