What is the difference between B ultrasound, color Doppler ultrasound and Doppler ultrasound?
"B-ultrasound is ultrasound? Four-dimensional, three-dimensional, B-ultrasound, and color ultrasound are indistinct in the clouds and fog? Does ultrasound have radiation? How do they accomplish difficult tasks? Is color ultrasound the color ultrasound?"
1. How does ultrasound work?
Ultrasound is a kind of vibration wave, which is transmitted through media such as water or air. The human ear can only feel the sound wave of 20-20000 Hz (20-20000 vibrations per second). When the frequency is greater than 20000 Hz, humans are listening No, this kind of sound wave that humans can't feel is ultrasound.
Ultrasound examination uses ultrasound equipment to send out ultrasound waves that cannot be heard by humans. As a medium, it encounters different human organs and produces different echoes. The ultrasound equipment performs analysis based on the different echoes received, and according to the transmission of each organ. Echoes at different times to locate the spatial position of a certain organ. According to the strength of the echo, it can also be determined whether the characteristics of the organ are normal or abnormal. Through ultrasound, we can judge the structure, size, and location of the human body that we can’t normally see...
2. Why not choose low sound waves for imaging?
Ultrasound has a smaller wavelength. The higher the ultrasonic frequency, the smaller the wavelength, the smaller the distance between the two points it can resolve, the higher the resolution, and the greater the fineness of the measured tissue. Therefore, medicine Ultrasound is often used for testing.
Ultrasound is non-invasive, and we can repeat it many times when necessary;
Ultrasound is a real-time detection. When the fetus is moving, we can accurately observe it. Therefore, ultrasound is widely used in prenatal examinations.
The frequency of ultrasonic waves emitted by medical ultrasound equipment is around 3 to 5 million Hz, which is more than 100 times the upper limit of the frequency of sound waves that humans can hear. Humans cannot hear the sound of these instruments.
3. Does ultrasound have radiation to the baby?
Radiation refers to any energy emitted or transmitted in the form of waves or particles through space and media, including what we use all the time: (non-ionizing radiation) visible light, infrared, microwave, radio waves, very low frequency waves, thermal radiation .
Few people worry that visible light and sound waves will harm us, even though it is also a kind of radiation. People often worry about the "is there radiation" really refers to ionizing radiation: alpha particles, beta particles, neutrons, X-rays, Y-rays, they are all high-energy radiation, they can make electrons away from the atoms related to it The process of generating ions is called ionization. Ions are very destructive to various molecules of the human body, including DNA and proteins. This type of radiation is higher than non-ionizing radiation.
In medicine, there are applications of this type of ionizing radiation, but reasonable and careful applications, such as CT and X-rays, are relatively safe. Ultrasound is a sound wave, not ionizing radiation, and will not cause the same damage as ionizing radiation.
However, although it is not ionizing radiation, sound waves are always a kind of energy, and there are still potential possibilities. When the energy is very high, it will produce some reactions of other organisms other than "ionization": "thermobiological effect", "cavitation" Phenomenon"-it usually occurs when the dose level is much higher than that of conventional diagnostic ultrasound.
Ultrasound has undergone decades of clinical application. Up to now, there is no medical evidence that obstetric ultrasound will cause obvious, short-term or long-term effects on the fetus.
4. B-ultrasound = ultrasound?
B-ultrasound is just the most common type of ultrasound.
The most common, the most basic, and the most important: two-dimensional ultrasound (B-ultrasound), which displays the structure in different degrees of black and white to observe whether the baby’s structure and size are normal. Some activities are not The black one is another color. This is not a color Doppler ultrasound. It just uses another color to replace different levels of grayscale.
Color Doppler ultrasound is used to display blood flow. It uses different colors and brightness to display the direction and speed of blood flow, which helps us observe blood vessels and the heart.
Sometimes doctors need to accurately observe the waveform of blood flow, and when measuring its velocity, they will switch to another ultrasound: Doppler ultrasound. Pregnant mothers may be most familiar with three-dimensional and four-dimensional ultrasound.
Three-dimensional and four-dimensional ultrasound: The collected plane images are converted into three-dimensional, three-dimensional and four-dimensional images through the ultrasound conversion software in the instrument. This display mode is the closest to the habit of seeing things with the naked eye. Pregnant moms and dads generally like this Display mode. Three-dimensional and four-dimensional ultrasound can help obstetricians check the abnormalities of the fetus. At present, the biggest role is to take a picture and record an image for the pregnant parents to remember. From the perspective of diagnosis, their role is relatively limited.
