In the time since I started diagnostic imaging, I have encountered numerous questions such as “Is there radiation in this test” and “How much radiation is harmful to my body? First of all, let’s talk about what radiation is used in imaging examinations. MRI examinations are radiation-free, and so far, except for those with contraindications, no MRI examinations have been found to be harmful to the body. Secondly, why do you need a test with radiation? Imaging is the main way to see what is going on inside the body, and sometimes imaging is the only way to confirm a disease. Doctors can develop the best treatment plan based on the test results, so that the disease can be detected and treated early and other unnecessary tests and disease progression can be avoided. For example, after a traumatic injury to determine whether there is a fracture, intracranial hemorrhage, organ rupture, etc., an imaging test can detect the problem early so that it can be dealt with early and prevent the situation from deteriorating and thus affecting recovery or endangering life; after a prolonged cough to determine whether it is a lung infection, or cancer, or an upper respiratory tract lesion, etc. Of course, there are other cases that must be listed. Some people also think that this test is unnecessary because sometimes there is nothing wrong with the test, but I think it is still necessary to do it. As long as the doctor has prescribed this test, it means that he suspects that you may have a problem in that area, and if you do not have a problem in this area, you can exclude a treatment method and can use a treatment plan that is more suitable for your situation and can achieve better results. On the issue of radiation, let me first say that radiation definitely has some effect on the body, but the radiation dose of imaging is very low, and the radiation doses of the several tests mentioned above are within the safety standards set by the state and are checked regularly every year, and there is no direct harm to the human body, in fact, we are exposed to small doses of radiation every day, dirt, air, rocks, the universe, etc. There are small doses of radiation, and, many people are exposed to more radiation in the environment than these checks, so don’t worry too much about an occasional checkup. For example, now we all know that the things we eat have a variety of substances harmful to the body, but in order to survive we must also eat, why? It is because the benefits outweigh the disadvantages! Similarly, in order to find out the factors that harm our body in time, early detection of lesions and treatment, sometimes imaging is also necessary, although there may be some harm to the body. How to reduce the harm of imaging? Perform imaging examinations only when there are clear medical indications, expose only the areas that need to be evaluated, and if other diagnostic methods can be used without imaging effects, change the examination method, such as ultrasonography, MRI, etc.