The advantage of CT thin-layer scanning is that it can show the morphology and density of lesions more clearly and in more detail.CT thin-layer scanning is not easy to miss the diagnosis of lesions.In the past, the layer thickness of the old CT machines was relatively thick, some of them were 7.5mm, for lung lesions, the tiny nodules in the lungs of 1-2mm would be missed.The current CT layer thickness can be as thick as 0.5mm, so that these tiny nodules will not appear to be missed. The current CT layer thickness can reach 0.5mm, so that these tiny nodules will not be missed. In addition, thin-layer scanning can show the relationship between the lesion and the surrounding tissues in more detail, and can show subtle imaging signs, which can help doctors to treat patients.