CT examination can detect most of the masses in the lungs, depending on the specific type of CT and the size of the mass. Plain CT scanning has a layer spacing of 5-10 mm and can detect lung nodules larger than 1 cm, while nodules smaller than 1 cm can be easily missed, therefore, plain CT is mainly used for general routine checkups or emergencies. Enhanced CT refers to the injection of contrast agent through a peripheral vein before examination, which can elevate the density difference between the lesion site and normal body tissues and improve the detection rate of lesions. However, for lung nodules smaller than 2 cm and with predominantly ground-glass components, the degree of enhancement of enhanced CT is limited, and the detection rate is reduced. Thin-layer CT, with its smaller layer spacing and higher resolution, can more accurately determine the density of small lung nodules, and is commonly used for lung cancer screening or postoperative follow-up of tumors. Therefore, CT examination can be performed for daily physical examination and lung mass screening, and the condition can be promptly evaluated by a doctor after the examination.