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目的 评价螺旋ＣＴ 对孤立性肺结节（ＳＰＮ） 的鉴别诊断价值。方法 从常规ＣＴ 检查中选取４３ 例ＳＰＮ 患者，行螺旋ＣＴ 和高分辨率ＣＴ（ＨＲＣＴ） ，对比分析结节的边缘、轮廓、内部特征及其与周围结构关系，比较两种检查的效果。结果 两种扫描结节轮廓显示无差异，螺旋ＣＴ 不能发现ＨＲＣＴ 显示的结节内点状钙化及脂肪密度，但是螺旋ＣＴ显示血管及支气管移位和穿过结节，及其与周围结构关系等方面优于ＨＲＣＴ。结论 螺旋ＣＴ 对ＳＰＮ 许多征象显示可获与ＨＲＣＴ 相似效果，但是显示结节内点状钙化及脂肪成份的能力差，显示结节与周围结构关系较好。
Objective To evaluate the value of spiral CT in the differential diagnosis of solitary pulmonary nodules (SPN). Methods Forty-three cases of SPN were selected from routine CT examination. Spiral CT and high resolution CT (HRCT) were performed to compare the edge, contour and internal features of the nodules with their surrounding structures. The effects of the two methods were compared. Results There was no difference in the outline of the two scanning nodules. Spiral CT failed to detect punctate calcification and fat density in nodules, but spiral CT showed vascular and bronchial translocation and passage through the nodules and their relationship with the surrounding structures Better than HRCT. Conclusions Spiral CT showed similar results to HRCT in many signs of SPN, but showed poor ability of punctate calcification and fat composition in nodules, showing a good relationship between nodules and surrounding structures.