Gastrointestinal ultrasonography using “echogenic” ultrasound contrast agent has a history of nearly 20 years, and has some experience and accumulation in the field of gastrointestinal ultrasonography. Gastroscopy is still the “gold standard” for the diagnosis of gastrointestinal diseases, and gastrointestinal ultrasonography cannot be replaced, but it is a useful supplement for the diagnosis of gastrointestinal diseases and is worth promoting and developing. Preparation for gastrointestinal ultrasound examination: 1. Gastric ultrasound examination is generally scheduled to be performed in the morning every day under fasting condition. 2, the day before the examination dinner should be into a light diet, should not eat easy to produce gas, not easy to digest food; check before the general fasting 8 hours, abstain from drinking for more than 4 hours. 3.Gastric ultrasound examination is usually arranged before the barium X-ray examination. If the patient has already performed barium meal examination, the ultrasound examination can be delayed until the next day. Patients with pyloric obstruction must wait for the barium to empty before ultrasound examination. For patients with acute gastric ultrasound such as suspected gastrointestinal perforation, acute gastric dilatation, etc. and pyloric obstruction, routine abdominal exploration is first performed on an empty stomach to find out whether there is gastrointestinal perforation or acute gastric dilatation, and if so, contrast is contraindicated; for pyloric obstruction, the presence or absence of gastric retention and obstruction status is understood to determine whether contrast is needed to further clarify the diagnosis. In general, patients are routinely given contrast and then scanned according to the standard gastroduodenal section. How to use contrast agent: Take one packet of instant gastrointestinal contrast aid (50g), pour it into a sterilized cup, brew it directly to 500~600ml with boiling water at 90~100℃, stir it rapidly to present a uniform paste solution, and after it cools to a suitable temperature (generally controlled at 30-50℃), ask the patient to drink it or perform ultrasonography while taking it. The amount is about 200-300ml for young children, and the amount of contrast agent can be increased to 800-800ml for those with large stomach volume who are tall. Indications and contraindications for gastric ultrasonography by filling method I. Indications 1. Tumors (1) Benign tumors: gastric polyps, smooth muscle tumors, other benign tumors of mesenchymal tissue (such as fibroids, hemangiomas, lipomas, etc.). (2) Malignant tumors: gastric cancer, gastric smooth muscle sarcoma, gastric malignant lymphoma, gastric metastatic cancer, etc. (2) Inflammatory diseases acute and chronic gastritis, gastric ulcer, inflammatory granuloma in the stomach, abscess in the stomach wall (3) Gastric mucosal lesions gastric mucosal prolapse disease giant gastric mucosal hypertrophy, etc. 4, congenital lesions congenital hypertrophic pyloric stenosis, gastric cyst, gastric wall pancreatic ectopia, gastric inversion, etc. 5, obstructive diseases pancreatic dystrophy, various causes (such as tumor, inflammation, etc.) caused by the pylorus, cardia obstruction. 6, other diseases: gastric stone disease, gastric foreign body disease, gastric ascariasis, fundic varices, gastric prolapse. 7. Perigastric organ lesions: stones and tumors in the lower part of the common bile duct, tumors in the jugular abdomen, pancreatic tumors, left kidney and adrenal tumors, retroperitoneal lymph nodes, retroperitoneal macrovascular lesions, etc. Contraindications Acute gastric dilatation, upper gastrointestinal perforation, active hemorrhage in the upper gastrointestinal tract.