What is the harm of ultrasound to the human body? Will ultrasound affect the human body?

Low. Dosage.

Ultrasound is potentially carcinogenic and carcinogenic.

Malformation. factors, and different.

Frequency. Different.

Sound intensity. Yes different.

Individual. There is a certain harm. Because.

Ultrasonic. to solids and.

Liquid. All have a strong ability to penetrate, energy.

Larger when can make the substance.

Particles. For high-frequency vibration, part of the energy can also be converted. Thermal energy. Envoy.

Part. The temperature rises. High intensity.

Pulse. Ultrasound is small in the micron range of content.

Bubble. When propagated in the liquid, it can cause bubbles to shrink, expand and even violently**, a phenomenon called "cavitation". Not so long ago, the famous American super.

Biophysics. Expert Carstanson noted that some clinically used ultrasound.

Image. The maximum output of the diagnostic instrument.

Strength. has reached 1 kilowatt square centimeter, and this strength is enough to make.

Organisms. Produce.

Transients. Cavitation. For living organisms, transient.

Cavitation. , approaching.

Bubble. Nearby.

Cell. can be damaged, in general, in the human body.

Organ. and biofluids, damaging a small number of cells will not be harmful to the human body.

Long-term exposure to ultrasound can cause a slight fever in human tissues; When the frequency is higher, the heat becomes more and more severe, causing the water molecules in the human body to be burned and the surrounding tissues to be destroyed, which is dangerous for a long time. Therefore, high-power and high-intensity ultrasound waves continue to act on the human body, which is harmful; The intermittent action of low-power ultrasound on the human body is beneficial. It's like someone giving you a light thump on the back and you're comfortable, but you're in pain or even hurt when you hit you hard.

Safety risks – overuse or impact on fetal development.

Regarding the risk, Li Jianguo, president of the Chinese Society of Ultrasound Medical Engineering and director of the ultrasound department of Peking University People's Hospital, made it clear that routine prenatal ultrasound examination is very necessary and should be advocated for deformity, but excessive use, too high sound power, too long time, and too many times may have a potential impact on fetal development. And the effects may be slow, and it will take generations to be noticed.

In December 2014, the U.S. FDA issued a statement strongly opposing the patting of fetuses**, and Dr. Shahram, a biomedical engineer, said that ultrasound can warm up human tissue, and in some cases can produce very small bubbles. This warming and small bubbles may affect the normal development of the embryo.

Ultrasound is not a source of radiation and is generally not harmful to the human body, but excessive ultrasound is still not good for the human body.

We know that when an object vibrates, it emits sound, and the number of vibrations per second is called the frequency of sound, and it is measured in hertz. The frequency of sound waves that we humans can hear is 20 to 20,000 Hz. If the frequency of the sound wave is greater than 20,000 Hz or less than 20 Hz, we cannot hear it.

Sound waves with frequencies higher than 20,000 hertz are called "ultrasound".

Ultrasound, which is usually used for medical diagnosis, has a frequency of 1 5 MHz. Ultrasonic waves have the characteristics of good directionality, strong penetrating ability, easy to obtain concentrated sound energy, and long propagation distance in water. It can be used for distance measurement, speed measurement, cleaning, welding, stone crushing, etc.

It has an obvious role in medicine, military, industry and agriculture, and high-power focused ultrasound can be used for ** tumors, which can quickly raise the tissue temperature in the target area to more than 70 in seconds, so that intracellular proteins can quickly appear coagulative necrosis (the critical point of the lethal temperature of tumor cells is 45, and for liver tissue, the local temperature exceeds 58 can cause tissue coagulation necrosis).

The local sound intensity is as high as >> 10,000 watts cm2 or more, of course, there may be damage to local normal tissues, and precise positioning is required. In terms of ultrasound protection, it is necessary to pay attention to the fact that people with hearing diseases and neurological disorders should not work around such equipment, and high-intensity ultrasound equipment should be shielded to block ultrasound. At present, there is no exact data to prove that ultrasonic welding machines are too harmful to the human body, but the only drawback is that you must wear earplugs when welding to prevent long-term work and impact on hearing!

If ultrasound is harmful or not, the sound intensity, contact time, contact site and sound wave morphology should be considered.

The human ear can accept sound in the range from 16 to 20,000 Hz, and vibrations can be felt when the frequency of sound reaches 25 to 8,200 Hz. Sounds below 16 Hz are called bass, and sounds above 20,000 Hz are called ultrasound. More than 20 years ago, scientists began to seriously study the effects of sound on the human body, and as a result, they discovered the harmful effects of ultrasound on internal organs.

Long-term exposure to sound above 20,000 Hz can cause a slight heating of human tissues. When the frequency is high to ultrasound or higher, the fever becomes more and more severe. As a result, the water molecules in the body are burned and the surrounding tissues are destroyed.

Ultrasound is even more dangerous if left unchecked, causing bleeding, inflammation and arthritis.

High-frequency instruments, such as electric guitars, emit a lot of ultrasound when played. In this way, the joints and fingers of the musician's hands are damaged. Because of the clothing, the body suffers less damage. Sometimes putting an electric guitar on a bent knee can also affect the knee.

High-power, high-intensity ultrasound waves that continue to act on human tissues are harmful. Low-power ultrasound is very beneficial in intermittent action on human tissues. Ultrasound is a type of vibrating mechanical wave.

To give you a layman's example, when someone gives you a light thump on the back you feel comfortable, but when you hit you hard, you feel pain or even hurt.

At present, scientific experiments have proved that ultrasound is harmless to the human body, so there is no need to worry about ultrasound affecting the health of individuals, such concerns should not be had.

Medical diagnostic ultrasound is low-intensity and harmless. However, the use of ultrasound is dangerous, especially high-intensity focused ultrasound (HIFU).

Sound waves are divided into: infrasound, sound waves, ultrasound waves (by frequency) Infrasound waves - inaudible and harmful to people (less than 20 Hz) Audible sound waves - the variety of sounds you can hear (20 to 20,000 Hz) Ultrasound - inaudible, current research is harmless to people (more than 20,000 Hz).

Responsibly tell you some key information about ultrasound:

Ultrasound is a very high frequency oscillating wave that carries a lot of energy.

If it is effectively and precisely controlled, it can do things like break up stones; If you are in an ultrasound environment frequently or for a long time, your body will be greatly affected.

There are no theoretical studies that show that under the condition of the same amplitude, the energy of an object vibrating is proportional to the vibration frequency, and when the ultrasonic wave propagates in the medium, the frequency of the vibration of the medium particle is very high, so the energy is large. In the dry winter in northern China, if the ultrasonic wave is passed into the water tank, the violent vibration will break the water in the tank into many small droplets, and then use a small fan to blow the droplets into the room, which can increase the indoor air humidity. This is how ultrasonic humidifiers work.

Pharyngolaryngitis. For diseases such as tracheitis, it is difficult for the medicine to reach the affected area. Using the principle of humidifier, the liquid medicine is atomized and inhaled by the patient, which can improve the efficacy.

The huge energy of ultrasound can also make the stones in the human body break by violent forced vibration, so as to alleviate the pain and achieve the best purpose.

Low-dose ultrasound is a potential carcinogenic and teratogenic factor, and different frequencies and different sound intensities are harmful to different individuals. Because ultrasonic waves have a strong ability to penetrate solids and liquids, when the energy is large, it can make the particles of matter vibrate at high frequency, and part of the energy can also be converted into heat energy, so that the local temperature rises. When high-intensity pulsed ultrasound waves propagate in a liquid containing small bubbles in the micron range, they can cause the bubbles to shrink, expand, and even violently**, a phenomenon known as cavitation.

Not long ago, the famous American ultrabiophysicist Carlson pointed out that the maximum output intensity of ultrasound imaging diagnostic instruments used in some clinics has reached 1 kilowatt square centimeter, which is enough to cause transient cavitation of organisms. For organisms, cells near the bubble will be damaged during transient cavitation, and in general, in most organs and biological fluids in the human body, damage to a small number of cells will not cause harm to the human body.