The dose of radiation used for PET-CT examination is equivalent to that of an X-ray, which is within the acceptable safety range for human body, so the damage is not significant. For tumor patients who need a clear diagnosis, PET-CT can give a more accurate diagnosis and facilitate timely and correct treatment, so the advantages outweigh the disadvantages for tumor patients. However, PET-CT is not recommended to be used for medical checkups for the general public, which will increase the dose of exposure to the public, so the advantages outweigh the disadvantages at this point.