There are very many items of ultrasound examination, as follows: 1. Neck: large arteries such as carotid artery, jugular vein, vertebral artery, cervical lymph nodes, thyroid gland; 2. Thorax: heart, pericardium; 3. Abdominal cavity: intra-abdominal organs including liver, gallbladder, pancreas, spleen, kidney, ureter, bladder and prostate, large abdominal vessels, retroperitoneal lymph nodes, etc., female uterus and ovaries, and fetus and appendages are examined after pregnancy; 4. Blood vessels of extremities: various arteries and veins of upper and lower extremities; 5. Various muscles and bone cavities, etc.