目的 对比观察常规剂量与低剂量多层螺旋CT扫描对分析肺结节的差异,探讨多层螺旋CT低剂量扫描对检测肺结节的应用价值.方法 对60例常规CT检查发现肺结节的患者采用GE Brightspeed 16层螺旋CT扫描仪分别以常规剂量和30 mA低剂量扫描,比较不同剂量CT扫描结节的检出率,分析常规剂量和低剂量扫描影像显示结节数目、结节大小及形态特征.结果 两种扫描方案检出结节的大小、分叶征、毛刺征、空泡征、密度不均匀、钙化、胸膜凹陷等征象间差异均无统计学意义(P＞0.05);且两种扫描方案扫描肺结节的直径间差异无统计学意义(P＞0.05).结论 30 mA低剂量与常规剂量螺旋CT扫描对肺结节的检查价值相近,但低剂量CT扫描减少了X线对人体可能造成的损伤,更适合对肺结节进行筛查、初步诊断和随访.%Objective To analyze the differences between low - dose spiral CT and regular dose CT in detecting pulmonary nodules and to evaluate the values of low - dose spiral CT scan in diagnosis of patients with pulmonary nodules. Methods Sixty patients with pulmonary nodules detected by regular CT were once again scanned by a GE Brightspeed 16 - slice spiral CT scanner at 250 mA and 30 mA respectively. Detection rates of nodules were c:ompared between the two doses , with the numher,size, and morphological features of these nodules concluded by each scanning protocol analyzed. Results No significant difference were ohserved between the two scanning protocols in terms of in nodule detection rate , nodular size and nodular morphology ( lobulation sign, spicule sing, bronchus encapsulated air sign, non - uniform density , calcification, and so on ) ( P ＞ 0.05).Conclusion Diagnosis values of low - dose and regular dose spiral CT are similar in the examination of pulmonary nodules. However, low - dose spiral CT is more preferable in the screening, first diagnosis and follow - up of lung nodules because it is less harmful to the human body.
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