Beijing Konted Medical Technology Co.,Ltd.

Preparation Work Before B-Mode Ultrasound Examination

Working principle of handheld ultrasound device

The basic building blocks of the ultrasound machine include five main components such as transmitting, sweeping, receiving, signal processing and displaying, which are divided into two major components, namely the host and the probe. the key component of the b ultrasound handheld ultrasound is the ultrasound probe, which has an ultrasound transducer inside, used to realize the conversion of electrical signals and ultrasound. The host is mainly used to receive the information collected by the probe, process it accordingly, and display the results in the form of images.

The basic principle of the work of the handheld ultrasound device is to scan the body by emitting a set of ultrasound waves from the ultrasound probe in a certain direction. According to the monitoring of the delay time of the echo and the strength and weakness pattern of the echo, the distance and nature of each organ can be judged, combined with pathology and clinical medicine, after observing, analyzing and summarizing various reflection patterns, and then making a diagnosis of the location, nature and degree of dysfunction of the lesion. This method of diagnosis is highly effective, and the handheld ultrasound probe allows for quick and accurate diagnoses, making it a vital tool in modern medicine.

The following preparations should be made before going to the hospital for handheld ultrasound device examination

Gallbladder and pancreas

When doing an ultrasound examination of gallbladder with the mobile ultrasound device, you should eat less fatty food the day before and should not eat 8 hours before the examination (i.e. after dinner the day before the examination). If the gallbladder does not show the need for reexamination, fatty foods must be abstained from 24-48 hours. If the patient also has to undergo gastrointestinal or cholecystography at the same time, ultrasound should be scheduled before them, or after three days of barium gastrointestinal meal and two days of cholangiography. Preparation for pancreatic examination is the same as that for gallbladder.


No special preparation is needed for simple examination of the spleen, but after a full meal, the spleen is shifted to the upper back and affects the image, so an empty stomach is preferable. 


For gastrointestinal and other upper gastrointestinal examinations, easy-to-digest food should be eaten the night before, and fasting and abstaining from food and water on the morning of the examination. If patients need to do a gastrointestinal X-ray or fiberoptic endoscopy at the same time, handheld ultrasound equipment should also be scheduled before them, or 2-3 days after, to avoid interference with barium and gas. For rectal examination, the patient still needs to keep the bladder full, so he should not urinate 2-3 hours before the examination. Before the colon examination, attention should be paid to emptying the bowels.

Retroperitoneal organs

The preparation is the same as the gallbladder. To distinguish whether the lesion is in the pelvis, the bladder should be kept full before the examination. Do not perform barium contrast two days before the examination.

Liver and kidney

No special preparation is generally required before examination with handheld ultrasound equipment, but it is best to perform on an empty stomach.

Obstetrics and gynecology ultrasonography

The preparation is the same as gallbladder. However, you should stop urinating 2-3 hours before the examination and drink 500-800ML of water if necessary, making sure to make the bladder feel inflated. If it is in the early stages of pregnancy, it is not necessary to drink water to avoid overfilling of the bladder and compression of the uterus. For transvaginal ultrasound, there is no need to drink special water.

Young children may be uncooperative during ultrasound examinations and should be sedated in advance. For abdominal organ examination, if the patient has excessive gas in the abdomen or constipation, the doctor may order a laxative the night before the examination or give an enema before the examination, and the patient should cooperate carefully.