How much harm does ct do to people? I believe many people are familiar with ct examination. We all think that ct is an examination instrument with serious radiation and great influence on the body. Let's share how much damage ct does to people.
How much harm does ct do to people? What is 1 CT?
CT examination has the characteristics of sensitivity, accuracy, specificity and accurate location, which can understand the overall situation of the whole body at a glance and achieve the role of early detection of lesions and diagnosis of diseases.
Generally speaking, CT examination is a three-dimensional X-ray examination. X-ray inspection is like seeing a big watermelon. You can only see the shape, but you can't see whether the watermelon is ripe, whether it has seeds, whether it is red or yellow. CT inspection can not only see all this, but also see it layer by layer. CT examination plays an important role in the diagnosis of many diseases.
Although CT is more accurate than X-ray, doctors will not open this examination at will unless it is necessary.
What is the need for CT examination?
CT examination can not only effectively diagnose skull problems, including craniocerebral trauma, cerebral infarction, brain tumor, congenital malformation and so on. In addition, CT has certain diagnostic value for heart problems, such as pericardial tumor, pericardial effusion and other heart diseases.
In addition to the heart and brain, CT can clearly show the liver, gallbladder, spleen, pancreas, kidney, adrenal gland and other parenchymal organs. For tumor, infection and trauma, it can clearly show the pathological degree of anatomical parts, which is of great value for pathological staging. In addition, CT can also be used as one of the commonly used methods to diagnose ovarian, cervical and uterine, bladder, seminal vesicle, prostate and rectal tumors.
Generally speaking, CT examination is widely used and can be used to diagnose diseases in many parts of our body, and the diagnosis results are relatively accurate. Therefore, when there is a need for CT examination, don't resist. However, CT examination is not suitable for everyone. The following people must be careful when choosing CT examination to avoid adverse effects on their health.
Class 4, be careful of CT
The first thing you need to know is that "caution" does not mean that you must not do it. It means that you must be evaluated by a doctor before you can judge whether you can do CT examination.
1,/kloc-infants under 0/0 and elderly people over 60, whose physical resistance is relatively poor, are more likely to be affected by radiation;
2. Patients with heart disease also have certain safety risks. If you have this medical history, you should explain it to the doctor in advance;
3, people with allergies, such as asthma, eczema and other diseases, are not suitable for CT examination;
4. Patients with renal insufficiency should not have CT examination, because the iodine injected before CT examination is not easy to be excreted by the body, and it will be toxic if it accumulates to a certain extent.
CT examination also has certain contraindications, so don't do it reluctantly, so as not to fail to achieve the purpose of examination and harm your health.
What is the radiation hazard of CT? Does it really cause cancer?
CT examination does have a certain amount of radiation, but radiation can be said to be ubiquitous in daily life, such as radiation from the earth itself and radionuclides in house decoration materials. So don't talk about radiation.
Generally speaking, the radiation dose of medical examination is very low. For example, in a chest X-ray examination, the radiation dose received by the examinee is only 0.0 1mSv, the head CT scan is 2-2.8mSv, the chest CT scan is 5.7-8.0mSv, and the abdominal and pelvic CT scan is 100mSv- 14.
So as long as it is a reasonable examination, you don't have to worry too much about the radiation problems caused by CT examination. However, it should be noted that long-term exposure to ionizing radiation will increase the prevalence of malignant tumors (about 8%).
So we can draw a conclusion that although CT examination has radiation, if it can be used reasonably, the advantages outweigh the disadvantages!
To sum up, doctors should be informed of their own medical history during CT examination, and then doctors can judge whether CT examination is necessary and appropriate. Don't resist the examination just because CT has radiation, because CT examination can help clinicians make correct treatment plans in time and maximize the interests of patients as long as it is used reasonably.
How much harm does ct do to people? What is 2 CT?
Many people have misunderstandings about ct. They must have panicked when they saw those lights. Actually, don't worry. Ct has the advantages of sensitivity, accuracy and accurate location. Many other tests can't be done, only ct can do it.
To put it bluntly, the X-ray we usually do is equivalent to flattening people to observe, while the magnetic resonance vibration is to shake people to observe. Ct is much better. It slices people directly and observes them piece by piece.
You know how accurate ct is in this analogy. There are two forms of ct, namely plain scan and enhanced scan.
Generally, people who go to see a doctor for the first time, or people who don't understand the condition at all, do ordinary plain scans and finish them in a few seconds. If obvious lesions are seen at this time, or a definite diagnosis can be made, then the next operation is not needed.
However, if the ordinary plain scan can't make a clear diagnosis or can't see clearly, then enhanced ct is needed. At this time, don't think the doctor is lying to you.
Who needs to do it and who doesn't recommend it?
In our neurosurgery, there are many problems that need ct assistance, such as craniocerebral trauma, cerebral infarction, brain tumor and so on.
In addition to brain and heart problems and solid organs such as liver, gallbladder and kidney, ct is also relatively clear.
Although ct is widely used, it is not recommended for the following people for various reasons.
Patients with heart disease; /kloc-infants under 0 years old and elderly people over 60 years old; Have asthma, eczema and other diseases; Allergic constitution; People with renal insufficiency.
Does CT have radiation? Will it cause cancer?
The main source of harm in ct is ionizing radiation produced by X-rays, because this radiation will destroy our macromolecular structure and damage cells.
Do you start to worry when you see this? Actually, there is no need to be nervous! In any case, regardless of the dose, toxicity is hooliganism. Just like drinking water, drinking too much water will lead to water poisoning.
In fact, in our daily life, radiation exists in many cases, as long as it does not exceed the specified value in the national radiation protection standard. More importantly, the radiation dose in medical examination is very low, for example, the head ct scan is only 2-2.8mSv, which is far below the standard.
Can ct cause cancer? This possibility exists! But there is a premise, that is, long-term high-dose radiation exposure.
So, don't panic when you hear about ct. If it is so dangerous to do ct, can ct still be popularized in major hospitals? I'm afraid I've been squeezed by patients!
How much harm does ct do to people? 3 What is ct examination?
Ct examination is a kind of computerized tomography, which uses a detector with high accuracy and sensitivity to scan directly around a certain part of the body. In each scanning process, the detector will directly pass through the human body to receive the information sent by X-rays, and then these analog values will be converted into numerical values by the converter, and then input into the computer for high-speed calculation, thus obtaining the X-ray absorption value, and displaying different data at different levels through the display, so that the anatomical structure of this part of the body can be clearly displayed on the monitor.
In most cases, the human body has a certain degree of tolerance to radiation injury, which is acquired in the long-term evolution process, but this tolerance has a certain limit, beyond which certain symptoms or pathological changes will occur, from dizziness, fatigue, nausea and vomiting, to blood cell decline, heart and other important organ damage, brain function decline and even epilepsy and coma. When the radiation is large enough, it will even lead to human functional failure or even death in a short time.
Radiation warning sign
What are the hazards of ct examination?
Ct is an invisible and intangible ray with strong penetrating power, which can penetrate human body and general objects, even some metal products. If you are exposed frequently in a short period of time, it is easy to cause leukopenia, resulting in fatigue, dizziness, vomiting and other symptoms. Especially pregnant women, newborns and frail patients, adverse reactions such as canceration of body organs are prone to occur after irradiation.
After the radiation emitted by ct penetrates the human body, it will cause slight harm to the human body, thus causing ionization and excitation reaction of biological macromolecules and small molecules in the body, thus producing some harmful substances. If you don't do any protection when re-irradiating, it will also cause direct harm to your body.
If the examiner is injured, it is easy to induce cancer, hereditary diseases and mental decline. Clinically, after routine ct examination, the patient has diarrhea and severe dizziness, and the cells suddenly drop, which is half less than that of normal people. It can be seen that ct is still harmful to people's health, so it needs to be well protected when doing ct, especially under the guidance of doctors.
Many people are very worried about the number of CT scans, and think that doing multiple CT scans in a short time will cause cancer. I don't have strong data to refute this view, but no one can prove that chest CT is related to lung cancer or other organ tumors. After all, compared with smoking and other carcinogenic factors, normal people are much less exposed to CT, and there is no evidence that CT scanning causes cancer.
Lung cancer map in the detailed description
For normal people, frequent chest CT examination is unnecessary and unnecessary. The number of physical examinations can be controlled once a year. In most cases, it is enough to do lung disease screening for lung cancer once a year. If CT does not find any lesions, the possibility of developing advanced lung cancer in the next year is very small. However, if lung lesions have occurred, CT should be done, even twice a week, when evaluating the therapeutic effect and pathological changes.
A friend just had a physical examination last week, and after finishing it, he was a little worried: "The doctor insisted that everyone should have a CT scan, but I heard that CT radiation can cause cancer ... if this CT scan is done, will it do great harm to the body?" In fact, many friends will have such concerns when doing ct. CT has radiation. I heard that radiation causes cancer, and I can't avoid radiation.
In fact, ct does produce some radiation to the human body, but it depends on the dose.
CT, it's not as dangerous as you think.
Although the body will be exposed to radiation when doing CT, the amount of radiation is actually very small. For example, chest low-dose CT is a common one. Every time you do it, the radiation received by the body is about 1-2mSv, and the radiation of the head CT is 2 msv. Radiation is related to the site to be examined and positively related to the dose. The greater the dose, the greater the radiation and the greater the harm to the body. However, if you only do a CT examination once in a while, the radiation received by the body is actually very small, which has little effect on the body and will not have a significant impact.
Normal physical examination, should do CT or have to do it, this time
The radiation dose to the body is very small. Only when the radiation dose is higher than 100mSv in that year can the risk of cancer be increased. That is to say, it is equivalent to doing about 50 chest CT examinations every year, and your health may be threatened.
It can be seen that doing CT once in a while will not affect your health, so don't worry. However, sometimes when you go to the hospital for physical examination, the doctor still asks for enhanced CT. What is the reason? Is enhanced CT necessary?
Under what circumstances must CT examination be done?
Suspected lesions in the chest: When the chest is uncomfortable and suspected to be tumor, inflammation, bronchiectasis, fracture and other lesions, CT examination is needed, and the next step is judged according to the inspection report. Chest CT is also a common examination in daily life, which will not produce great radiation to the body.
Brain diseases: CT examination is the first choice for diagnosis of critical diseases such as cerebral hemorrhage and acute cerebral infarction. Its examination process is very fast, and it can draw conclusions in time to prepare for treatment. In addition, head-related diseases such as brain trauma, brain tumor or abnormal brain development also need CT examination.
Bone and joint problems: CT examination of bone and joint, according to the three-dimensional imaging results of diseased parts, can judge whether there are lesions, tumors, inflammation and other conditions in bone and joint, and effectively prevent and treat bone and joint diseases.
Heart disease: In addition to ECG examination, CT examination is inevitable. Through the image results of CT examination, we can judge whether there are lesions in the artery, such as tumor, deformity, occlusion and so on.
Abdominal diseases: for the diagnosis of diseases such as gallbladder, spleen, reproductive system and urinary system, CT examination is also needed. By judging whether there are lesions on the examination report and their situation, the corresponding tissues and organs can be diagnosed.
In a word, CT examination is a very important clinical diagnostic method, which is of great significance for the diagnosis of many diseases.
Tips: Although ct examination is harmful, it is very practical, especially for the brain, cardiovascular and cerebrovascular diseases and some organs of the body. If the doctor suggests a ct examination, it means that the patient needs this examination, because he is afraid that ct will do harm to his body, so he can't resist it. This is not only not conducive to the doctor's judgment, but also easy to make the physical condition unable to get accurate treatment.