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What is the gel applied for ultrasound examination?
What is the gel applied for ultrasound examination? Health care workers who perform ultrasound examinations always apply a layer of clear gel before touching the probe with the examiner. You might think it’s a lubricant, but that’s just a secondary role. The official name of this gel is Ultrasonic Coupling Agent, and its main purpose, as its name suggests, is as a medium for “coupling”. Ultrasonography scans the human body with ultrasound waves (frequency greater than 20 kHz) that are inaudible to the human ear, and converts the echo signals into image information inside the body. B-ultrasound presents black and white images with different brightness (Brightness), while color Doppler ultrasound presents the blood flow of tissues in color on this basis. However, as a mechanical wave, the propagation of sound waves is affected by changes in the medium. Although the probe of the ultrasound equipment is next to the skin, the dry contact is inevitably separated by air. Due to the large difference in acoustic impedance between the air and the human body, two completely different media, sound waves will be reflected a lot at the interface between the two, and a lot of sound energy has been lost before...
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Doppler Fetal Heart Rate Can Detect Twins
Fetal Doppler can monitor fetal movement and fetal heart rate to reflect the condition of the fetus in the mother’s body. After 35 weeks of pregnancy, pregnant women should perform fetal heart rate monitoring when they go to the hospital for an obstetric examination every week. However, this can only be monitored at a specific time period and cannot be monitored as needed, so expectant mothers are also required to develop the habit of detecting fetal movement by themselves every day. Can Fetal Doppler Detect Twins? Yes, because Doppler fetal heart rate is judged by detecting fetal heart sounds, so it can detect twins or multiples, which is a very useful monitoring instrument. What is the principle of Doppler fetal heart rate? Doppler fetal heart rate monitor is mainly an electronic instrument used for fetal heart rate monitoring. Generally, maternity hospitals provide fetal heart rate monitoring. The Doppler fetal heart rate monitor is more commonly used in the market, and the ultrasound Doppler technology is mostly used, and the ultrasound dose is small. The Doppler fetal heart rate meter calculates the number of heartbeats in each cardiac cycle of the fetal heart rate, and traces it on the chart in...
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What The Advantages Of PCR Test
Digital PCR can directly measure the number of nucleic acid molecules in the initial sample, which is the absolute value quantification of nucleic acid concentration, and is an epoch-making nucleic acid detection technology. Compared with qRT-PCR, the core advantages of digital PCR are reflected in high detection accuracy, high sensitivity, simple overall operation, stable system, excellent repeatability, and can effectively avoid cross-contamination between samples, specifically: (1) The reported result is the copy number of the target gene, which provides a more accurate nucleic acid quantification basis for clinical diagnosis and treatment; (2) The detection gray area is greatly reduced. By intuitively reading the quantitative results, human errors are avoided, and the high reliability and repeatability of the detection results are guaranteed; (3) It can eliminate the interference of samples with complex components such as feces on the experimental results, and avoid false negative results caused by component inhibitors. In conclusion, digital PCR can effectively avoid the missed detection of patients with low viral load, and help to detect the disease as soon as possible and take isolation measures. Recently, the Frontier Center of the Chinese Academy of Metrology has successfully developed a SARS-CoV-2 nucleic acid detection reagent based on digital...
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How much do you know about ultrasonography?
1. Which parts of the ultrasound examination need fasting? Ultrasonic examination of the liver, gallbladder, pancreas, adrenal gland, renal artery, left renal vein (nutcracker), etc. requires fasting for 8 to 12 hours. 2. Why fasting? This is determined by the inherent acoustic characteristics of ultrasound, which is afraid of interference from intestinal gas. Because after eating, the gas in the gastrointestinal tract will increase, which will affect the imaging effect, and the doctor will not be able to see clearly. In addition, after eating, the gallbladder shrinks, and the lesions in the gallbladder cannot be detected in time. 3. Which parts of the ultrasound examination need to hold back urine? Examination of uterine appendages, urinary system, prostate, seminal vesicles, etc. requires moderate holding back of urine. 4. Why do you need to hold back your urine? After holding back the urine moderately, the bladder can serve as a good sound-transmitting window, and can push the intestines away, so that the image will be clearer. However, excessive holding back of urine may cause difficulties in diagnosis. Excessive holding back of urine will push the uterus backward, which is not conducive to observation. Note: After 3 months of pregnancy, you can check...
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What is a color Doppler ultrasound?
It is usually composed of probes (phased array, linear array, convex array, mechanical fan scan, three-dimensional probe, endoscopic probe, etc.), ultrasonic transmitting/receiving circuit, signal processing and image display. Using ultrasonic Doppler technology and ultrasonic echo principle, it is a device that simultaneously collects blood flow motion, tissue motion information and human organ tissue imaging. It is used for ultrasound imaging, measurement and blood flow motion information acquisition for clinical ultrasound diagnostic examination. The probe can be passed through the esophagus, in the blood vessel, through the internal tissue of the human body during the operation, and/or used in the fields of ultrasound navigation and the like. 1. Color Doppler ultrasound generally uses autocorrelation technology for Doppler signal processing. The blood flow signal obtained by autocorrelation technology is color-coded and superimposed on the two-dimensional image in real time, that is, color Doppler ultrasound blood flow is formed. streaming images. It can be seen that color Doppler ultrasound (color Doppler ultrasound) not only has the advantages of two-dimensional ultrasound structural images, but also provides rich information on hemodynamics. For “non-invasive angiography”. Its main advantages are: ① It can quickly and intuitively display the two-dimensional plane distribution of blood flow. ②It can display...
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What is 3D/4D color Doppler ultrasound?
3D color Doppler ultrasound is a kind of color Doppler ultrasound, and 3D color Doppler ultrasound is a three-dimensional dynamic display. The advantages of 3D color ultrasound are mainly in the following fields ① The sensitivity and display rate of uterine artery and ovarian blood flow are high. ② Shorten the inspection time and obtain accurate Doppler spectrum. ③ No need to fill the bladder. ④Do not interfere with body type obesity, abdominal scars, and intestinal inflation. ⑤ Find the tender part of pelvic organs by means of the movement of the probe tip to determine whether there is adhesion in the pelvis. 3D color ultrasound surface imaging is used in obstetric examinations, not only to observe the process of fetal growth, but also to examine changes in the placenta, amniotic fluid and umbilical cord, and more importantly, it can be used as the main means to diagnose fetal malformations. Due to the large contrast between the tissue structure and the liquid gray level, it can clearly display the three-dimensional shape, surface features and spatial position relationship of the suspicious structure, and provide a three-dimensional image of the fetus in the womb. 3D reconstruction includes surface imaging, transparent imaging and...
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