If the patient is just an ordinary person, it is not necessary to do a medical checkup once every two months, and it is usually possible to do a CT examination of the lungs or the head once a year or so. However, if the patient is a tumor patient, or a patient after surgery for other diseases, it is possible that the examination time may need to be more frequent, some patients may need to have a CT examination every month for the first few months, and then as the condition gradually improves, the CT interval may be longer. It is also up to the doctor to decide whether the patient is suitable for CT and whether CT is needed.