8 times of ct radiation in 2 months caused cancer
8 times of ct radiation in 2 months caused cancer. Cancer-related diseases are all we are very afraid of, and many people worry that frequent ct scans will cause cancer. Next, I will take you to know more about the related contents of 8 times of ct radiation causing cancer in 2 months. 8 times of ct radiation in 2 months causes cancer for 1
, but it usually does not cause cancer. The occurrence of cancer usually has little to do with radiation and other factors. Generally, the radiation generated during CT examination can gradually disappear within one or two days. Try not to carry out ct examination too frequently in your life, considering that it may bring side effects to yourself. If you suspect that you have cancer, you can go to a regular hospital for a comprehensive examination to determine your condition, and you should maintain a good attitude during treatment.
Is frequent CT easy to cause cancer?
CT has radiation, but it does not mean that as long as it is exposed, it will definitely cause serious harm to the body, just like carcinogens. It is very imprecise to talk about toxicity without dose. Generally speaking, once done, the dose received by the human body is generally within 1msv, which is safe. However, its types are different, and the doses produced are also different. For example, the radiation dose received by the abdomen is slightly larger than that of the nose, and the dose is larger than that of the plain scan if enhanced CT is used.
If the dose is very large, such as over 1, it is really unsafe. When the dose reaches a certain level, it will damage people's nervous system, cause various discomforts and increase the risk of cancer. But under normal circumstances, we don't do this examination so often. Even if you want to do it, the doctor will consider the dose received by the human body, not to say that you can do it if you want to.
so, how many times can you do it a year?
generally speaking, it is safe to do it 1-3 times a year, but this is not absolute, and we should judge it according to our actual situation. If you examine not one part but multiple parts, then the dose received by the human body at one time will be more than that of only one part, depending on whether you do plain scan, enhanced scan or contrast scan. As long as the dose received within one year is within the safe range, you don't have to worry too much.
I want to say one more thing here. For PET-CT, don't over-deify it. It doesn't mean that cancer can be found as long as it is checked. Different types of cancer have different early definitions, so the examination should be targeted.
for people engaged in radiation work, there are regulations in China that the annual dose should not exceed 5msv. If you need to do it often because of physical reasons, then it is recommended to carry out relevant tests on a regular basis, such as blood routine, to check whether radiation has caused any impact on your body, and to intervene in time.
Speaking of this, many people may not know exactly what CT can detect. Under what circumstances do you need to do it?
It can scan around a certain part of the human body by using X-rays, Y-rays, etc., and can see the distribution and quantity of diseased parts, and can diagnose some cancers to a certain extent. For some nervous system diseases, it is a preferred examination method. In addition, for the adjacent organs with diseases, we can also learn some things through CT, such as abdominal, chest and bone problems, which can be said to be its advantages.
But everything has two sides, and CT has some shortcomings, such as relatively high examination cost, so it is not suitable as a routine examination method.
In addition, there are some precautions before, during and after the inspection, which should be understood by everyone to avoid affecting the inspection results and bringing unnecessary hidden dangers.
Before the examination, patients should take the initiative to tell themselves whether they have had any examinations and what drugs they have taken during this period, so that doctors can know more about their own situation, and if they feel unwell, they should also inform them in time. Anything with metal material should be taken off, and if the patient has a metal heart stent in his body, he should also inform the doctor. During the inspection, if you feel uncomfortable, you should also give timely feedback. After the inspection, don't go in a hurry, observe for about half an hour to prevent adverse reactions. It is recommended to drink more water at this time.
There are cases that need to be done, and of course there are cases that are not suitable. If there are the following cases, it may not be suitable:
(1) thyroid lesions
(2) liver and kidney dysfunction
(3) iodine contrast agent allergy
Some people may be surprised. There are no pregnant women among those who are not suitable for CT. Isn't it said that they can't be checked during pregnancy?
In fact, it doesn't mean that you can't do it during pregnancy. Even if the pelvic cavity is in a high dose, it generally does not exceed the threshold that will lead to fetal malformation. Whether you can do it during pregnancy depends on different people. According to your own situation, if the advantages outweigh the disadvantages, you need to do it. Of course, if you can use nuclear magnetic instead of CT, it is recommended that pregnant mothers choose the latter, because nuclear magnetic vibration has no radiation, which is safer. 8 times of ct radiation in 2 months causes cancer. 2 < P > The principle of CT
CT scans a certain part of the human body by using X-ray beams. The X-ray beams passing through this layer are received by the detector, converted into visible light, then converted into electrical signals by photoelectric conversion, and finally processed by the computer to form an image inspection. Simply put, CT examination is like cutting potato chips, and you can see which one is wrong. By layering X-rays through the human body, layered inspection can be achieved and more information can be displayed. However, X-ray is a kind of high-energy particle, which will destroy the cell function and metabolism of human body when it penetrates human body.
if the dose is not large, CT will only produce short-term effects, and the human body can repair itself. If the dose is large, it will damage genes, increase the probability of biological effects, and cause carcinogenic, hematopoietic, reproductive, genetic, growth and development, hormone regulation and other effects.
the positive significance of CT in the diagnosis and treatment of cancer patients
CT is widely used in cancer, including cancer scanning, auxiliary diagnosis of whether there is a tumor, cancer grading, and detection of tumor recurrence.
For example, routine X-ray and chest CT are effective screening methods for lung cancer in healthy people. However, conventional X-ray films are not sensitive to small lesions and hidden lesions, and the detection rate is low. Chest low-dose spiral CT is the best choice for screening lung cancer because of its low dose, Levin rate and high accuracy.
In CT examination, especially PET-CT has high accuracy in screening cancer. PET-CT injects radioactive deoxyglucose into the body to make it flow to all parts of the body, and then photographs the rays generated by these glucose through the corresponding examination parts, and judges whether there is cancer through the detected images, with an accuracy rate of 96%.
does frequent CT cause cancer?
the radiation dose of CT scanning is related to the times of CT. Usually, the radiation dose received by human body in one examination is .2mSv for chest X-ray plain film, 2mSv for head CT, 1.5mSv for low-dose chest CT in physical examination, 4-7mSv for chest CT and 8mSv for abdominal CT. However, the cumulative maximum safe dose of diagnostic scanning radiation for a person's life is 1mSv, that is to say, the risk of cancer caused by a single CT scan is very small.
However, if CT scans are performed for many times, the radiation dose will be different. Studies have shown that the risk of cancer will increase by .5% for every CT examination. This means that long-term exposure to X-rays is easy to cause cancer. For most people, the benefits from CT scanning far outweigh the potential risks. Cancer is generally difficult to occur unless exposed to long-term and large-dose radiation.
these people are not suitable for CT examination
although CT examination has the advantages of extremely high image definition, multi-organ function analysis and low radiation, not everyone is suitable for CT examination. There are 7 groups of people who are not suitable for CT examination, including: people who are allergic to iodine contrast media, people with severe liver and renal function damage, hyperthyroidism patients, people with renal insufficiency, people who have been allergic to contrast media and other drugs in the past, children under 1 year old and elderly people over 6 years old.
In addition, the doctor should be informed of the situation before CT examination, such as the detailed medical history, various examination results and whether there is any drug allergy. Cooperate with the doctor and follow the doctor's instructions during the examination. If there is any discomfort in CT examination, you should inform the doctor in time to avoid accidents.
Although CT examination will produce low-dose radiation, it is beneficial to us in the long run. Because any organism in the world has certain radiation, as long as the temperature is higher than absolute zero-273.15℃, it will radiate energy in the form of waves. However, we should also learn to prevent radiation. Take CT examination as an example. If X-rays and CT are not necessary, other examination methods can be used instead to avoid radiation exposure. 8 times of ct radiation in 2 months caused cancer. 3 < P > How much CT radiation < P > The dose measurement unit of radiation is mSv, and how much CT radiation is, which can be understood through the following examples. The dose of flying for 2 hours is .1mSv, the dose of chest film is about .2mSv, the dose of CT scanning is about 2mSv-1mSv, and the dose of chest x-ray is about 1.1 msv.
In 199, the International Radiological Committee suggested that the recommended dose limit for radiation caused by any work and life of the public should be 1mSv/ year. In fact, the radiation dose received by imaging workers (film-making or CT workers) is far more than 1mSv, but it does not exceed 2mSv per year on average in five years and 5mSv per year.
How does CT do harm to people
X-ray is a kind of high-energy particle, which will destroy the cell function and metabolism of human body when it penetrates human body. If the dose is not large, it will only have a short-term effect, and the human body can repair itself with relatively little harm.
If the X-ray dose is large, it will damage genes and produce various harmful biological effects, and with the increase of radiation dose, the probability of biological effects will also increase.
Biological effects include not only carcinogenic effects, but also effects of hematopoiesis, reproduction, heredity, growth and development, hormone regulation and so on. Madame Curie, as we are familiar with, is the leukemia caused by long-term and massive exposure to radioactive substances. < P > What is the probability of cancer caused by a CT scan? < P > Assuming that the human body is exposed to radiation, it takes such a process until the tumor appears: firstly, the DNA of some cells is broken due to radiation, and these damaged cells will undergo gene repair. If the repair fails, most of the cells will end in apoptosis, and occasionally there will be gene mutation, but the mutated cells will be removed by the immune system in most cases. It is really not so easy for normal cells to become immortalized cells after a small probability event.
From the animal experiments, unless exposed to long-term and high-dose radiation, it is generally difficult to develop cancer, and the probability of bone marrow suppression is higher.
Madame Curie, who had been dealing with radioactive substances all day, died of aplastic anemia (myelosuppression) because of long-term and large-scale exposure to radioactive substances, which is equivalent to taking CT pictures all the time.
risks and benefits
CT is very suitable for finding early lung cancer, judging cerebral hemorrhage, vascular reconstruction, malignant tumor staging, etc., but it is absolutely unnecessary to say that CT is used to diagnose gastric ulcer and pelvic CT to diagnose uterine fibroids, because each disease has its most suitable examination method, so it should be examined appropriately, or ultrasound examination is needed. If the diagnosis is unclear, further examination is needed.
When conducting CT examination, we should strictly follow the three basic principles of basic radiation protection of the International Commission on Radiological Protection.
first, the principle of legitimacy, which must ensure that the application of ionizing radiation does less harm to people than benefits;
Second, the principle of optimization, any irradiation should be kept at a reasonable minimum level to avoid unnecessary irradiation;
the third is the principle of limitation, which ensures that the dose received by individuals does not exceed the corresponding dose limit, and minimizes the harm caused by radioactive inspection to the subjects.
Taking the screening and early detection of lung cancer as an example, low-dose and high-resolution CT can find early asymptomatic lung cancer and win more opportunities for surgical resection. The benefits of early detection brought by CT to high-risk groups of lung cancer outweigh the harm of one-time irradiation.
It is unnecessary for patients with common pneumonia to have repeated CT reexamination in a short time, and chest radiographs can be used instead.
In a word, CT examination can be used with confidence. One or two examinations will not cause serious harm to human body, but it should not be misused or abused just because it is not harmful.