Lung imaging is currently the gold standard for clinical diagnosis of pneumonia. In the past, chest X-rays were commonly used, but with the development of medical technology, chest X-rays are gradually replaced by chest CT. With the development of medical technology, chest X-ray is gradually replaced by chest CT because it can observe the manifestation of inflammatory lesions in the lung and their absorption after treatment more clearly, more accurately and more comprehensively than chest X-ray, and the diagnosis is more precise. Currently, in clinical work, it is found that chest X-ray is not accurate enough and there are certain cases of leakage and misdiagnosis. For patients whose X-ray results suggest pneumonia or other lung disorders, it is often recommended to improve chest CT, which can improve the accuracy of diagnosis, reduce the rate of leakage and misdiagnosis, and is more conducive to the accurate treatment of patients.