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CT radiation has a certain influence on human body, but X-rays entering human body will not stay for a long time and will soon disappear. Therefore, it has no influence on the people around and the surrounding environment. Some experts say that the damage caused to human body 36 hours after CT irradiation can disappear and return to normal. X-rays are not taken from patients who have undergone CT examination, which will not have any adverse effects on others or the environment. At present, CT examination has shortened the irradiation time as much as possible and reduced the intensity of rays. At present, CT screening for lung cancer is called low-dose high-speed rotating CT, which minimizes the intake and harm to patients. There is also a large-scale radiotherapy equipment of linear accelerator, which uses X-rays to carry out radical radiotherapy on tumors, and its dose will be thousands of times higher than that of CT. Specifically for tumor irradiation, it will partially irradiate normal tissues, but the dose is very small. Because this is the only way to eliminate the tumor. In ct examination, we should shorten the irradiation time as much as possible, such as using CT contrast and CT reconstruction to make the images displayed by CT clearer and have higher resolution, shorten the irradiation time, reduce the injury of patients and minimize the impact of CT on patients. The time of CT examination varies from person to person, from illness to condition, and from equipment conditions. For example, after the patient receives tumor treatment, the doctor arranges for him to have a check-up once every month or three months, and the specific time depends on the needs of the disease. If brain surgery is performed, MRI or CT brain imaging should be performed on the 1 day after operation, because it depends on whether the tumor is completely removed and whether there is any residue after operation.