The B-mode ultrasound, commonly known as "ultrasound," is a medical test that patients are often exposed to during their visits to the doctor. It is widely used in the diagnosis of cardiology, gastroenterology, urology and obstetrics and gynecology. As an auxiliary department of the doctor, I found that patients have a lot of unclear places on the ultrasound, now I will talk to you about the abdominal "ultrasound" examination of the general knowledge. CT, nuclear magnetic **** vibration must be better than ultrasound? The answer is no. Ultrasound diagnostic technology as an important part of diagnostic imaging technology, there are indeed many better than CT, nuclear magnetic **** vibration characteristics. First of all, it is not only able to find lesions in the abdominal organs, but also coherent, dynamic observation of the movement and function of the organs; can track the lesions, show three-dimensional changes, and not subject to the limitations of its imaging stratification. For example, ultrasound is now recognized as the preferred examination method for diseases of the biliary system. Secondly, ultrasound can also monitor blood flow and direction in combination with Doppler technology for organs other than the substantial organs (liver, pancreas, spleen, kidneys, etc.), so as to identify the nature and extent of damage to the organs. For example, doctors can visualize the various structures in the heart and whether there are any abnormalities through cardiac ultrasound. Third, the ultrasound equipment is easy to move and non-invasive, so patients with limited mobility can be diagnosed at the bedside. Fourth, it is inexpensive. The cost of ultrasound examination is generally 35-150 yuan / time, is 1/10 of the CT examination, nuclear magnetic **** vibration of 1/30, which for most working-class people, is more affordable. "Ultrasound" is therefore often used for health checks. But does all this mean that "ultrasound" is superior to CT and MR*** vibration in all aspects? Not really. For example, B ultrasound in clarity, resolution, etc., significantly weaker than the latter, and easy to miss the cavity organ lesions, the results are also susceptible to the physician's clinical skills level. Abdominal ultrasound before the patient should do some preparation? 1, fasting and water. The day before the examination of the dinner, should be light and less residue food, food fasting overnight. The morning of the examination, breakfast and water should be prohibited to ensure that the morning in the case of fasting examination. This is mainly to reduce the interference of gastrointestinal contents and gas on the ultrasound beam and to ensure that the gallbladder and bile ducts are sufficiently filled with bile. In some cases, there is still a large amount of gas in the gastrointestinal tract even if the patient has abstained from eating and drinking. This part of the patient should be 1-2 days before the examination oral flatulence tablets (dimethyl bisiloxane tablets), to eliminate intestinal gas has a certain effect. 2. Two days before the ultrasound, gastrointestinal barium meal imaging and cholangiography should be avoided. For patients with gastrointestinal diseases, sometimes the doctor will prescribe barium meal fluoroscopy and ultrasound at the same time, and it is better for the patients to have ultrasound examination first, and then barium meal imaging. If there is barium in the gastrointestinal tract, it will not only affect the ultrasound image of the gallbladder and pancreas, but also be prone to misdiagnosis. 3, do urinary system ultrasound, especially ureter and bladder dirty ultrasound, should be 1-2 hours before the examination, drink warm water 400-600 ml, to be bladder full before examination. If the patient shall receive digestive and urinary examination at one time, it is best not to urinate in the morning on the day of the examination, so that you do not have to drink water to achieve the purpose of bladder filling. Is color ultrasound better than black and white ultrasound? Color ultrasound refers to "color Doppler diagnosis". It uses modern technology to convert Doppler signals into color signals and superimpose them on a two-dimensional black-and-white acoustic image to achieve color blood flow imaging, making it possible to observe and evaluate the intravascular space and blood flow status in vitro. Visible color ultrasound is mainly used for heart disease examination and blood flow detection of major blood vessels inside and outside of various organs of the human body. For example, in the diagnosis of digestive and urological diseases, the blood flow information of portal vein, hepatic artery and renal artery is obtained by color ultrasound. If the lesion has not yet reached the above blood vessels, but only the biliary system, pancreatic diseases, it is not necessary to do ultrasound, so as not to increase the economic burden. Can ultrasound examine the gastrointestinal tract? Due to the gastrointestinal tract in the air content is more, easy to interfere with the ultrasound beam, so that the structure of the display is not clear, and the use of ultrasound to do gastrointestinal examination of the preparatory work is complex, coupled with barium meal, gastrointestinal diagnostic accuracy of gastric and intestinal diseases and higher than the ultrasound, so generally ultrasound is not as the diagnosis of gastrointestinal diseases preferred method.