"I was hospitalized this year and did four CT scans before and after. Did I eat a lot of radiation after doing it so many times? "
"I'm so angry. I did a CT once, and the doctor couldn't tell me clearly the next day, so I did it again ... Is this a medical accident? "
Many people say that radiation discolors, but we also know that many auxiliary tests have radiation, especially CT. So how much radiation should I "eat" for a CT examination? How harmful is it to human body?
CT is a well-known medical testing instrument, the full name of which is "Computed Tomography" in English and "Computed Tomography" in Chinese. 1967, British engineer Godfrey Nhounsfield invented CT, 1972, which was formally applied in clinic.
CT uses the characteristics of X-rays to project the different attenuation of human tissues or organs, and then reconstructs the projection into an image by using mathematical principles, providing image reference for doctors' treatment. At present, CT examination is widely used in clinic, such as brain CT scan and chest CT scan.
CT imaging, like cutting radish, is composed of multiple cross sections, so it can show the internal central structure of tissues or organs and show the situation of diseased areas more comprehensively. Moreover, CT imaging has high density resolution, which can find tiny lesions in time and improve the detection rate of diseases.
But because CT examination is radioactive, people often worry about a question: will CT scanning cause cancer?
In fact, this kind of worry is completely unnecessary.
We can't feel radiation in real life, but radiation is actually everywhere. The sun has radiation, all kinds of building materials have radiation, even the food we eat has radiation. The data show that even if people don't do any inspection within one year, the amount of radiation they naturally receive is about 2.4mSv. For radiation, as long as it is beyond the dose to talk about danger, it belongs to real hooliganism.
Radiation will damage human DNA, but the radiation dose of CT is within a safe range and will not bring danger.
The radiation dose produced by a single CT scan is 0.2mSv, so as long as you don't check it frequently, you don't have to worry about the risks caused by radiation. In contrast, the radiation dose after flying for more than 20 hours can reach 0. 1mSv. Compared with CT scanning, the radiation dose received by frequent flight needs more attention.
However, these radiation values are within the safe range and the risk to the body is very low.
Although there is no need to worry about radiation in CT examination, there are still some necessary precautions.
First of all, the patient cannot move during the examination, so as not to cause false imaging and interfere with observation. Children patients or restless patients can cooperate with sedatives. Similarly, the metal ornaments worn by patients will also interfere with the examination results and should be removed during the examination.
Secondly, if you are doing abdominal examination, you should listen to the doctor's arrangement, drink water or take 300~500 ml 1.5 ~ 3% iodine aqueous solution in advance; When examining the liver or gallbladder, the patient needs an empty stomach; If the pelvic cavity is examined, the patient still needs to urinate.
It should be noted that patients with liver failure, renal failure and heart failure need to do iodine allergy test before examination. Children, the elderly and seriously ill patients should be accompanied during the examination. After the examination, patients can drink more water and eat more foods rich in vitamins.
In recent years, tens of thousands of PET-CT has become a popular inspection item. Compared with conventional CT, its sensitivity and detection rate are higher, so some people use it as an essential means to prevent cancer, even once a year. In fact, it is not worth the candle to do PET-CT for healthy adults.
PET-CT is mainly used for examination or reexamination of cancer patients. Because it knows where the lesion is, it is highly targeted. In contrast, healthy people can't find a clear area on the one hand, and have a higher probability of false positive or false negative on the other hand.
For example, PET-CT may mistake some common inflammation for cancer, but it is insensitive to bladder cancer and prostate cancer, resulting in false negative results.
Some authoritative medical institutions in the United States oppose the use of PET-CT for general examination of healthy people, which not only fails to find lesions, but also may cause greater negative risks to the body due to higher radiation dose.
According to statistics, a PET-CT examination is like the sun that has been exposed for 10 years. After the examination, the patient should be isolated from others for 2 hours before contact, especially to avoid premature contact with pregnant women and children.
Therefore, for the healthy public, it is enough to carry out routine physical examination items every year, and there is no need to do PET-CT examination.
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