When we have physical diseases, or physical examination in order to detect diseases as soon as possible, we have to carry out a series of imaging examinations. Often do some CT or MRI, then these tests for the human body radiation? Great harm to the human body?
X-ray
Yang Hanqin, chief physician of Department of Gastroenterology, General Hospital of Guangzhou Military Region, introduced the radiation level of X-ray in previous interview. He said that X-ray does have strong radiation, so repeated examination in a short time should be avoided as far as possible. After X-ray examination, it is recommended that women should be pregnant after 3 months.
Radiation can cause certain damage to different tissues and organs of the human body, especially to the hematopoietic system, gonad, lens, etc. And the more times of examination, the greater the damage. The X-ray dose of chest X-ray, cardiac catheterization and various radiography or gastrointestinal examination is relatively large, infants and pregnant women should try to avoid. Especially for pregnant women, abdominal plain film and pelvic measurement can not be abused within 3 months of pregnancy, which can only be carried out after full term. '
CT
Because CT examination takes a long time, its radiation will be higher than X-ray. Although the new technology appears now, the ray energy of some multislice CT will be greatly reduced, experts suggest that unnecessary radiation damage should be avoided.
It is better to make clear the examination site, and cover the parts that do not need to be exposed, such as thyroid gland and gonad, etc. at the same time, it is also better to avoid multiple examinations in a short time. If it is necessary for diagnosis, it is necessary to explain the situation to the doctor and take necessary covering methods for protection.
In addition, both male and female germ cells are highly sensitive tissues, so they are quite sensitive to radiation. For safety reasons, whether male or female, it is better to use contraception for three months after taking CT.
magnetic resonance
Magnetic resonance imaging principle and X-ray and CT are different, mainly using the energy released by nuclear magnetic resonance imaging, so it will not bring radiation hazards, and its health hazards have not yet been found, even if pregnant women and fetuses can carry out relevant examination, women do not need contraception after examination.
Ultrasonic examination
The principle of ultrasonic examination is to transmit the ultrasonic wave to the human body, and the interface of the tissue will send a signal to reflect back. By collecting these information, the image can be formed. The ultrasonic wave transmits energy in the form of mechanical vibration, so there is no radiation problem in the ultrasonic wave.
In fact, women need to apply ultrasound to the pre pregnancy examination and even during pregnancy. Therefore, this technology is safe for the human body, fetus and even germ cells, let alone other people.
In general, different imaging techniques have their advantages and disadvantages and focus on the field, we generally follow the doctor's advice to check, do not abuse the examination, and do not have to panic too much about the radiation.