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在螺旋ＣＴ出现之前，非螺旋ＣＴ由于不能进行大范围的容积扫描，较难发现并准确诊断胸、腹部的小病灶，特别是１ｃｍ以下的微小病灶。当今，随着螺旋ＣＴ的出现及推广使用，这一难题得到了较好的解决。但如果对每个有可疑病变的病人都用超薄层（５ｍｍ以下层距、层厚）螺旋扫
Before the advent of spiral CT, non-helical CT can not detect and accurately diagnose small lesions in the chest and abdomen, especially small lesions below 1 cm, because it can not perform a large volume scan. Today, with the advent and promotion of spiral CT, this problem has been solved well. However, if for each patient with suspicious lesions with ultra-thin layer (5mm below the layer thickness, thickness) spiral scan