Ultrasound has a wide range of applications and can examine many items. With proper preparation, ultrasound can be performed on all tissues and structures of the body, except for the bones and lungs and certain other organs and tissues. Ultrasound is also the first choice for most tumors of substantial organs, and it is usually possible to see abnormal masses in the liver, pancreas, spleen, kidneys, breast, thyroid and other tissues and organs, such as cystic or solid masses in the liver, pancreas, spleen, kidneys, breast, thyroid and other tissues. The ultrasound can also see cystic or solid masses in the liver, pancreas, spleen, kidneys, breast, thyroid and other tissues. In addition, the sonographic characteristics of the abnormal echogenicity such as boundary, morphology, surrounding structures and internal echogenicity can be described in detail to assist in the clinical diagnosis of the disease. In addition, ultrasound has certain clinical significance in the diagnosis of certain cavity organ diseases, such as benign and malignant tumors of the stomach wall and intestine, intestinal obstruction, and acute appendicitis. However, ultrasound also has certain limitations, for example, it is difficult to pass through bones, and ultrasound is also affected by gas, so the diagnosis of certain diseases needs to be further combined with other examinations to make the diagnosis more accurate. Therefore, ultrasound examination is widely used in clinical practice, and it is not only relatively inexpensive, but also safe. The types of diseases that can be diagnosed clinically are also particularly numerous.