B-ultrasound examination, commonly known as "B-ultrasound", is a medical examination item that patients often come into contact with when they see a doctor. Clinically, it is widely used in the diagnosis of diseases such as cardiology, gastroenterology, urology, obstetrics and gynecology. As a doctor in an auxiliary department, I found that patients have many unclear places about B-ultrasound. Now I'll tell you about the common sense of abdominal B-ultrasound. Are CT and MRI necessarily superior to B-ultrasound? The answer is no, as an important part of image diagnosis technology, ultrasonic diagnosis technology does have many advantages over CT and MRI. First of all, it can not only find the pathological changes of abdominal organs, but also observe the movement and function of organs coherently and dynamically. It can track lesions and display stereoscopic changes without being limited by its imaging stratification. For example, at present, ultrasound examination has been recognized as the first choice for biliary system diseases. Secondly, B-ultrasound can monitor the blood flow and direction of organs other than solid organs (liver, pancreas, spleen, kidney, etc.). ), so as to identify the nature and degree of organ damage. For example, doctors can visually see various structures in the heart and whether there are abnormalities through color Doppler echocardiography. Thirdly, the ultrasonic equipment is easy to move and non-invasive, and can diagnose patients with mobility difficulties at the bedside. Fourth, the price is low. The cost of ultrasound examination is generally 35- 150 yuan/time, which is110 for CT examination and 1/30 for NMR. This is more affordable for most working-class people. "B-ultrasound" is often used for physical examination. But does all this mean that "B-ultrasound" is superior to CT and MRI in all aspects? Not exactly. For example, B-ultrasound is obviously weaker than the latter in clarity and resolution, and it is easy to miss the diagnosis of hollow organ diseases, and the examination results are also easily affected by the doctor's clinical skill level. What preparations do patients need to make before doing abdominal B-ultrasound? 1, no food and no water. The dinner the day before the inspection should be based on light and less residue food, and fasting for one night after eating. Eating breakfast and drinking water should be forbidden in the morning of the examination to ensure an empty stomach examination in the morning. This is mainly to reduce the interference of gastrointestinal contents and gas on ultrasonic beam and ensure the bile in gallbladder and biliary tract is full. Sometimes, even if some patients have stopped eating, there is still a lot of gas in the gastrointestinal tract. These patients should take Zhang Xiao tablets (dimethicone tablets) 1 orally 0-2 days before the examination, which has a certain effect on eliminating intestinal gas. 2. Gastrointestinal barium meal radiography and cholangiography should be avoided two days before B-ultrasound. For patients with digestive system diseases, doctors sometimes prescribe barium meal fluoroscopy and B-ultrasound examination at the same time. It is best for patients to do B-ultrasound examination first, and then barium meal radiography. Because if barium remains in the gastrointestinal tract, it will not only affect the ultrasonic imaging of gallbladder and pancreas, but also easily lead to misdiagnosis. 3. Do the B-ultrasound examination of urinary system, especially the B-ultrasound examination of ureter and bladder. Drink 400-600 ml warm water 65438+ bladder filling 0-2 hours before the examination, and then check again. If the patient needs a one-time digestive and urinary system examination, it is best to check that the morning urine is not discharged on the same day, so that the bladder can be filled without drinking water. Is color B-ultrasound definitely better than black-and-white B-ultrasound? Color Doppler examination refers to "color Doppler diagnosis". It uses modern technology to convert Doppler signal into color signal, which is superimposed with two-dimensional black-and-white ultrasound image to realize color blood flow imaging, making it possible to observe and evaluate intravascular space and blood flow state in vitro. It can be seen that color Doppler ultrasound is mainly used for heart disease examination and blood flow detection of major blood vessels inside and outside human organs. For example, in the diagnosis of digestive system and urinary system diseases, the blood flow information of portal vein, hepatic artery and renal artery can be obtained by color Doppler ultrasound. If the lesion has not reached the above blood vessels, but only the biliary system and pancreas, it is not necessary to do color Doppler ultrasound to avoid increasing the economic burden. Can B-ultrasound check gastrointestinal tract? Because there is a lot of air in the gastrointestinal tract, it is easy to interfere with the B-ultrasound beam, which makes its structure unclear, and the preparation for B-ultrasound examination of the gastrointestinal tract is complicated, and the diagnostic accuracy of barium meal and gastrointestinal endoscopy is higher than that of B-ultrasound, so B-ultrasound is generally not the first choice for the diagnosis of gastrointestinal diseases.