When I did my residency shifts abroad, I had to see my own patients, write labs, and read my own x-rays. The teachers abroad believed that X-rays of the chest did not affect the human body much because the amount of radiation was small, but the amount of radiation from CT would be large. Therefore, when practicing medicine abroad, if the patient’s auscultation has obvious blistering sounds, the clinical manifestations and signs match, and can directly diagnose pneumonia, there is no need to take X-rays, but then it is usually a late consultation and the disease is more powerful. If, however, there is clinical suspicion, and pulmonary auscultation is not sufficient to make a direct diagnosis, radiographs are required. In fact, the amount of radiation in an X-ray chest x-ray is very small, a few thousandths of a second of exposure, which is what cell phones, radios, TVs, etc. usually add up to. In many cases, early pneumonia is not detected without a chest X-ray. In addition, children in Canada are especially fond of skiing, and many of them fall and have X-rays taken to determine if they have broken bones. So it is a basic skill in emergency medicine for doctors to be able to read X-rays and make a diagnosis on their own, rather than waiting for the official report to come out. It is recommended that you bring your child to see me directly. x-rays are usually only used to confirm the diagnosis of a condition, and pneumonia is usually only taken once. They are not reviewed unless the condition worsens. For fractures, they are usually taken twice or more, once to confirm the diagnosis and then at least once more for healing. It is certainly best to have fewer shots, but don’t just refuse to have them taken. Sometimes the delay can lead to more medication later on, which can cause more damage than the X-rays. Timing is always a problem, it is impossible to do anything to get both the fish and the bear’s paw, you must give up one of them, or even to give up a lot. When we make trade-offs, we are actually judging the pros and cons of choosing this thing, but the pros and cons are time-sensitive, and there cannot be an optimal time, it is only a retrospective theoretical value. Therefore, even a doctor who is good at endorsement needs experience, and even an experienced doctor cannot always catch that optimal point in time. After the film will kill some cells, but it is also a good time to eliminate some bad cells, do not worry too much, after the disease, appropriate increase some nutrition can be. I think it is still most important to make good daily protection work. However, the amount of radiation from CT is large, children are not an emergency must check, try to do as little as possible, if possible to replace the MRI instead.