Chest X-rays can detect some TB, but not all TB lesions can be detected by chest X-rays. Because the clarity of chest X-ray is relatively low and there are blind spots, there is a certain amount of misdiagnosis and leakage if the lesion is obscured by other tissues or if the lesion itself is too small. Chest X-ray has a higher radiation dose and is more harmful to the human body, so chest X-ray can be used to examine tuberculosis as well as other respiratory diseases. The clarity of chest X-ray is significantly higher than that of chest X-ray, and the image can be fixed, so that multiple people can consult and read the film, which improves the diagnosis rate to a certain extent. However, chest radiographs also have limitations, as they cannot detect small lesions and nodules, which can also lead to missed diagnoses. In order to reduce leakage and improve the diagnosis rate, CT chest examination with higher definition is available, which can detect small lesions. The price of chest CT is not much higher than that of chest X-ray, so it is relatively cost-effective. Therefore, choosing chest CT examination for patients suspected of tuberculosis will improve the diagnosis rate of tuberculosis and reduce misdiagnosis and leakage. In addition to chest imaging, diagnosis of TB can be made by other laboratory tests. If there is coughing and sputum, it can be examined by sputum smear and sputum culture. Sputum culture for Mycobacterium tuberculosis is one of the most reliable ways to diagnose TB. In addition, the diagnosis of tuberculosis can also be aided by the gamma interferon release test and tuberculin test. If the patient has an irritating choking cough and bronchial tuberculosis is suspected, bronchoscopy, alveolar lavage fluid, and biopsy of lung tissue are also usually required to help diagnose tuberculosis.