Orthopantomogram of the chest is not CT. Orthopantomogram of the chest refers to X-rays, not CT, and they are completely different. If the patient is considered to have respiratory infection, acute bronchitis, pneumonia, etc., the examination of chest orthopantomograph is feasible. When the patient considers pulmonary nodules, bronchiectasis, interstitial lung disease, it is necessary to improve the CT examination, and different examination methods should be taken according to the condition. CT has higher resolution than chest X-ray, and the image is more obvious, and for nodules and masses that cannot be characterized, further identification can be made by CT.