Tuberculosis is a respiratory infectious disease caused by Mycobacterium tuberculosis infection, and its clinical symptoms include cough, low fever in the afternoon, night sweats, and emaciation. For common tuberculosis, the diagnosis can be made by the above-mentioned typical symptoms and chest X-ray examination, and CT is not necessary to detect it. The gold standard for confirming the diagnosis of pulmonary tuberculosis is to find acid-fast bacilli, for example, by finding acid-fast bacilli on ordinary sputum smear or bronchial lavage smear staining, pulmonary tuberculosis can be diagnosed. Lung CT can clarify lung lesions and can accurately determine the changes on CT of typical pulmonary tuberculosis, and has higher resolution and relatively higher accuracy compared to chest radiographs, but is not a necessary test and is not the gold standard for diagnosis.