Lung CT films need to be viewed by comparing the lung window with the mediastinal window.
1. Lung CT films are based on the body’s absorption of light, presenting a black and white image of low and high density. The lung window is mainly to look at the lung texture, trachea and bronchial alignment, whether there are any obvious lesions in the lungs, such as inflammation, tumors, etc., and the density of foci should be higher than that of the normal lung tissues, and also to pay attention to pneumothorax, pulmonary atelectasis and so on.
2. Lung CT films should also be viewed from the mediastinal window, mainly observing whether there are obvious lymph nodes in the mediastinum, whether there are space-occupying lesions in the mediastinum, thickening of the esophagus, pleural effusion, rib fracture, skin of the chest wall and so on. If a clear plain scan is not possible, an intensified scan can be performed to determine if there are enlarged lymph nodes.
In addition, in the case of a dense lesion in the lungs it is necessary to combine both the mediastinal window and the lung window to see if there is any visualization on the mediastinal window and if it is a calcified focus.
In the case of people with chronic disease, the reading of films also needs to be analyzed in conjunction with the dynamic contrast analysis of old films, as well as in combination with clinical symptoms and history of occupational exposure.
If there is a problem with the lung CT examination, it is recommended to further consult the doctor to clarify the cause of the disease and actively cooperate with the treatment.