Health

The difference between ultrasonography and B-ultrasound

  When it comes to ultrasonography, people will first think of B-ultrasound, and think that B-ultrasound is ultrasonography. In fact, B-ultrasound is only one type of ultrasonography.
  What is ultrasonography
  Ultrasound mainly refers to sound waves with a frequency greater than 20,000 Hz. Due to the large difference between the acoustic characteristics of various tissues and organs in the human body and the ultrasonic acoustic characteristics, the ultrasonic diagnostic instrument can accurately record the images, curves and waveforms formed by the ultrasound entering the human body. Physicians can achieve accurate diagnosis of various diseases through the observation and analysis of ultrasound images. Ultrasound diagnosis includes body surface ultrasound and intracavity ultrasound. Ultrasound examinations received by most patients are body surface ultrasonography, while diseases such as digestive system diseases, prostate diseases, vaginal and uterine lesions have deep lesions, intracavity ultrasonography is required. Ultrasound diagnosis has the advantages of non-invasive, repeatable, simple operation, no radiation, and low cost, and has gradually become the first choice for clinical diagnosis of many diseases. Ultrasound examination has a wide range of applications, mainly including obstetrics and gynecology, urology, cardiovascular medicine, nephrology, brain surgery, etc. It is rarely used in the diagnosis of gastrointestinal diseases.
  Advantages of ultrasonography
  At present , ultrasonography is widely used in medical institutions at all levels. Scanning with an ultrasonic probe can clearly display the location and shape of multiple tissues and organs in the body. By observing the performance of breast, thyroid, kidney, liver and gallbladder, pancreas, spleen and other solid organs, as well as bladder and other hollow organs, It can determine whether there are lesions, or complete the differential diagnosis of various diseases, and then provide reference for clinical treatment. At the same time, some medical institutions use ultrasonography as a routine physical examination item to achieve the purpose of early screening of various diseases.
  What is the difference between ultrasonography and B-ultrasound
  Ultrasonography includes A-type, B-type, C-type, D-type, E-type, M-type. A-type ultrasound is also called amplitude-modulated ultrasound. The main principle is to display the echoes generated after the ultrasound meets human tissues and organs in the form of waves on the top of the screen. It is a typical one-dimensional imaging mode, and the amount of detection information that can be obtained is relatively small Less, the scope of clinical application is small, mainly used to measure the depth of tissues and organs. B-mode ultrasound, also known as ultrasound tomography, is the most widely used ultrasound examination method in clinical practice. Pregnancy examination, pelvic examination, abdominal examination, breast examination, thyroid examination, cardiovascular system examination, etc. C-mode ultrasound can realize color imaging, and can use red and blue to display the blood flow inside blood vessels and tissues and organs. D-mode ultrasound, also known as Doppler ultrasound, is a relatively advanced ultrasound examination technology at present, which can display the direction and speed of blood flow, measure hemodynamic indicators, and display blood flow spectrum. D-mode ultrasound can provide physicians with conventional two-dimensional ultrasound images, as well as color blood flow images, which can help improve the diagnostic accuracy of various diseases. M-mode ultrasound can display the movement of tissues and organs, and can draw movement curves, allowing doctors to dynamically evaluate the changes in patients’ conditions. From the above analysis, it can be known that B-ultrasound is a kind of ultrasonography.
  What is B-ultrasound examination?
  The main feature of B-ultrasound examination is to use gray scale modulation to display the sonogram generated after the ultrasonic sound speed passes through the section of the human body. Physicians can realize accurate diagnosis of diseases through observation. During the B-ultrasound examination, the doctor can use the ultrasonic probe to perform linear scanning or sector scanning. The ultrasonic waves emitted by the probe can generate echoes after touching human tissues, and the display screen displays the echo status in grayscale. After different human tissues and organs are exposed to ultrasound, there are great differences in the echo intensity and echo attenuation. For example, the degree of echo attenuation in bile and urine is low, and the ultrasound image shows low echo; the degree of echo failure in bones and lungs is high. , the ultrasound image shows strong echo; the heart, liver, muscle, and brain tissue have moderate echo failure, and the ultrasound image shows moderate echo. Physicians can determine the anatomical structure and morphological characteristics of various tissues and organs in the human body by observing the sonograms, and can diagnose various diseases.
  What is the scope of application of B-ultrasound examination?
  The scope of application of B-ultrasound examination is as follows: (1) Morphological changes of tissues and organs. It can be used in the diagnosis of diseases related to tissue and organ morphological changes such as hepatitis, fatty liver, cholecystitis, splenomegaly, hydronephrosis, ureteral dilation, adnexitis, enlarged lymph nodes, and mammary gland hyperplasia. (2) Diagnosis of pleural effusion and pericardial effusion. It can accurately measure the depth, range and sound transmission of pleural and pericardial effusions. (3) Fetal growth and development. It can measure fetal head circumference, biparietal diameter, abdominal circumference and other indicators, and then determine the growth and development status of the fetus. (4) Space-occupying lesions. It can display the location, shape, boundary and echo status of cystic, solid and mixed space-occupying lesions.
  What are the advantages and disadvantages of B-ultrasound examination?
  At this stage , the scope of application of B-ultrasound examination in medical institutions at all levels is expanding day by day. The main advantages are that the examination process is completely non-invasive, easy to operate, good repeatability, and low cost. Through the scanning of the ultrasound probe, cross-sectional images of multiple organs can be obtained. Physicians can intuitively and clearly observe the echo, shape, volume, and boundary conditions of each tissue and organ, and then realize accurate diagnosis of various diseases. At the same time, B-ultrasound also has certain defects. For example, the penetration of the sound beam during the inspection is insufficient, it cannot reach the deep bone area, it cannot clearly display the sonographic features of gas-containing organs such as the gastrointestinal tract and lungs, and it cannot Displaying blood flow signals can lead to misdiagnosis and missed diagnosis of some diseases.

  Precautions for B-ultrasound examination
  In order to improve the accuracy of B-ultrasound examination results, patients need to understand the relevant precautions in detail. (1) Do not eat sweet potatoes, milk and other foods that are prone to gas production before the B-ultrasound examination, so as to avoid gas production in the intestinal tract and affect the sound transmission effect. (2) According to the examination, the patient is required to hold back or urinate in advance. During the B-ultrasound examination, women in the first trimester need to drink an appropriate amount of boiled water in advance, and go to the medical institution for examination after holding back urine to save examination time. Women in the second or third trimester of pregnancy need to urinate before B-ultrasound examination. The main reason is that women in the second and third trimesters have a large uterus and a large amount of amniotic fluid. B-ultrasound examination needs to explore the fetal development status through amniotic fluid. For example, there is urine in the bladder. It can affect the imaging effect of the fetus. (3) Keep your clothes loose. During the B-ultrasound examination, it is necessary to wear relatively loose clothing, maintain a relaxed state of mind, and correctly cooperate with the doctor to complete various operations to ensure the accuracy of the examination results. (4) Other precautions. During the B-ultrasound examination of the heart, the patient needs to maintain a supine position and fully expose the chest so that the doctor can complete the detection-related operations; before the B-ultrasound examination of the deep tissues and organs disturbed by digestive tract gas, the intestinal preparation must be properly completed, and beans should be fasted. Products, milk and other foods that are prone to gas production, keep a light and easy-to-digest diet the day before the examination, and fast on the day of the examination; B-ultrasound examination was performed 3 days after the contrast examination; during the examination of the bladder, prostate, uterus and accessories by B-ultrasound, it was necessary to drink 1000 ml of boiled water 2 hours before the examination, and some urine was kept in the bladder to ensure the accuracy of the examination results. B-ultrasound examination is a routine examination item during pregnancy. Although there is no radiation and sound waves have no damage to human tissues, it is still necessary to control the time and frequency of examinations. It is recommended to undergo the first B-ultrasound examination at 12 to 16 weeks of pregnancy to confirm single or multiple pregnancy and pregnancy. Fetal development status; a second B-ultrasound examination is required at 20 to 25 weeks of gestation to evaluate the fetal position and amniotic fluid status to determine whether there is fetal malformation; a B-ultrasound examination is required after 37 weeks of gestation to evaluate the fetal maturity.
  To sum up, B-ultrasound examination is a type of ultrasonography. During the clinical ultrasound diagnosis, it is necessary to comprehensively analyze the clinical data of the patient, select the ultrasound examination method reasonably, and master the key points of differential diagnosis of various diseases to improve the diagnostic accuracy.

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