CT values of pure solid nodules in the lungs are usually diagnostic at 50 to 70 Hu. If the CT value suggests a solid nodule in the lungs, it can be initially determined to be a soft tissue occupancy, and further investigations can be performed to clarify the diagnosis. For example, chest puncture cytology is performed, or enhanced CT is performed to find out whether the pure solid nodule is a benign or malignant nodule. CT values for solid nodules in the lungs are usually between 50 and 70 Hu, and tissue density can be determined based on the CT value. If it is lower than this value, the nodule is considered to be relatively low density, and if it is greater than this value, the nodule is considered to have the potential for calcification or foci of proliferation. Solid nodules in the lungs require further examination and prompt treatment, and prompt medical attention is recommended to avoid delay.