Pulmonary CT examination is, to be precise, a CT examination of the chest, which can examine the following: 1. lung tissue examination, for example, it can detect inflammation in the lung, such as fluid, gas, fracture and lung injury, the presence of tumors, and the relationship between tumor site, morphology and surrounding, so as to provide a basis for diagnosis and predict the outcome of treatment; 2. observation of the trachea, such as the presence of abnormal development and tumors; 3. observation of the mediastinum and the heart, observation of CT examination, that is, electronic computerized tomography, is to examine the body in slices, with the characteristics of fast scanning speed and clear images, which can be used for the examination of many diseases and can make up for the shortcomings of conventional chest X-ray examination. It can be used for a variety of diseases and can make up for the shortcomings of conventional chest X-ray and for smaller diseases that cannot be examined.