Lung enhancement imaging, or lung CT enhancement scanning, is an imaging modality that improves the contrast between diseased tissue and normal lung tissue. Lung CT enhancement scan refers to the method of injecting the contrast agent into the vein, so that the contrast agent enters the blood vessels where the lesion tissue is located, and then performs the CT scanning method, which mainly includes conventional enhancement scan, dynamic enhancement scan, delayed enhancement scan, and multi-phase enhancement scan. Lung CT enhancement scan is usually performed on the basis of lesions found in CT scanning examination, and it is suitable for identifying whether the lung and mediastinal lesions are vascular or non-vascular lesions, understanding the blood supply of the lesions, and clarifying the relationship between the lesions and cardiac blood vessels, etc., and it is especially important for the identification of benign and malignant lesions. It should be noted that this test is contraindicated in patients who are allergic to contrast media.