The price of a chest radiograph is usually 140 yuan. A chest radiograph generally requires an ortho- and lateral radiograph, and the price of both the ortho- and lateral radiographs is 70 yuan, so a total of 140 yuan is needed to take an ortho- and lateral radiograph of the chest. The radiation dose of a chest radiograph is only 0.02 mSv, which is quite low. The main purpose of routine chest X-ray is to clarify whether there is any obvious inflammation, tuberculosis or tumor in the lung, whether there is any obvious deviation in the mediastinum, whether the trachea and bronchi are centered, and whether there is any obvious abnormal enlargement of the heart and large blood vessel shadow. However, chest X-ray has certain limitations and may miss the diagnosis, such as tiny nodules and early ground glass-like nodules on the lung may not be seen on the chest X-ray, and this is the time to choose chest CT to examine.