Having just had a CT and then having another CT, only two CT examinations in a short period of time will not cause greater harm to the body and there is no need to worry excessively. In order to clarify the development of the disease and assess the efficacy of the treatment, sometimes two short-term CT examinations will be performed, such as patients with pneumonia in order to clarify the effectiveness of anti-infection treatment, sometimes after a week of antibiotics, CT will be performed again to assess whether the inflammatory foci of the lungs have subsided.The radiation dose of the CT examination is relatively small, and the two examinations will not have a great impact on the body. Patients do not need to worry too much; the radiation dose from CT is minimal compared to the benefits of a clear diagnosis and basically does not have a major impact on adults. Although CT has a certain amount of radiation, which may cause damage to the body, the body also has a certain ability to repair and can fight against such damage. So there is no need to resist CT examination.