X-rays have a certain radiation effect on the body, especially on the development of the blood system and bones of children, because the physiological development of children is not yet in a more mature state, if they do a cranial CT If you do a cranial CT examination, it will have an effect on the hematopoietic system and bones. However, children need to be accompanied by their family members when doing the MRI because of the magnetic field and the loud sound, which may be psychologically scary for children, but the cost of MRI may be more expensive compared to CT.