If the CT indicates a pure solid nodule in the lung, the CT value can be used to initially determine whether the nodule is a soft tissue occupancy, and further examination can be done by chest percutaneous lung aspiration cytology, or by chest enhancement CT to find out whether the pure solid nodule is enhanced or unevenly enhanced after enhancement, and to To determine whether the purely solid nodule is benign or malignant. In conclusion, the CT value of a solid nodule in the lung is between 50-70 Hu. If it is lower than this value, the density of the nodule is considered to be relatively low, and if it is significantly higher than this value, it does not exclude the possibility of calcified or proliferating nodules.