We are exposed to the knowledge of radiation, the most commonly recognized is nuclear radiation, which is very destructive to all living things. The explosion in Hiroshima and Nagasaki was a vivid example. Although nuclear radiation is harmful to all organisms, the human CT scanner invented by the principle of radiation in medicine has made a lot of contributions to the diagnosis of human diseases, which makes doctors seem to have it A pair of perspective eyes. So, since CT has a qualitative radiation, is it bad for us to go to the hospital to take CT? < / P > < p > first of all, radiation is safe within a certain range. Most of scientists’ research on ionizing radiation comes from long-term studies of people who survived the bombings in Hiroshima and Nagasaki in 1945. These studies show that there is a slightly significant increase in the risk of cancer among those exposed to the explosion, including 25000 Hiroshima survivors with radiation below 50 mSv, which is the amount of radiation obtained by three or more consecutive CT scans. < / P > < p > the actual radiation exposure depends on many factors, including the device itself, scan duration, your size, and the sensitivity of the target tissue. , Volume 1. 248, pp. 254-63) < / P > < p > from the above information, we can see that the maximum radiation dose of CT scanner to the human body is 40.7 mSv, which is the same as the radiation amount received by nuclear explosion survivors, and it is also far lower than the maximum radiation amount per person per year.. Therefore, the working radiation dose of CT scanner is harmless, but it can not be continuous, or the radiation received by CT scanner exceeds the standard of 100 mSv. < / P > < p > the radiation obtained by X-ray and CT nuclear imaging is ionizing radiation, high-energy wavelength or particles penetrating tissues, which can see through the internal organs and structures of the human body. But ionizing radiation can damage DNA. Although the cells in our body can repair most of the damaged DNA, sometimes these cells can not successfully repair the damaged DNA, leaving only a small “disrepair” area. As a result, DNA mutations may lead to cancer. Compared with CT, chest X-ray can radiate millisieverts, while chest CT can radiate 7 millisieverts, which is 70 times of the former. This does not include the very common follow-up CT scan. In fact, we have always been exposed to small doses of ionizing radiation from nature, especially cosmic radiation, and some radioactive gases, which come from the natural decomposition of uranium in soil, rock, water and uranium, as well as other building materials. Although we receive this natural radiation all the time, the average annual radiation is only 3 mSv. Waistcoat line type abdominal abuse posture, shaping the perfect abdominal curve!