320排CT不同三维重组方法诊断周围型小肺癌的价值

目的研究320排CT不同三维重组方法诊断原发性周围型小肺癌的应用价值。方法分析41例经病理证实为原发性周围型小肺癌的CT征象，结节直径均不超过3cm，比较薄层横断图像与不同三维重组图像（包括MPR、VR、MIP）对小肺癌基本征象的显示率。结果与横断图像比较，三维重组图像对周围型小肺癌的空泡征或含气支气管征、细支气管阻塞或截断征、胸膜凹陷征、血管集束征的显示率（68％、44％、90％、63％）有明显提高（P〈0．05），对分叶征和边缘毛糙征的显示率（97％、93％）无明显提高（P〉0．05）。结论320排CT同三维重组方法能充分显示原发性周围型小肺癌的形态学特征．为诊断提供更多的信息。

Diagnostic value of 320-detector-row CT for small peripheral lung cancer

Objective To investigate the diagnostic value of 320-detector-row CT with multiple threedimensional reconstruction methods in small peripheral lung cancer. Methods CT of 41 patients with pathologically confirmed primary small peripheral lung cancer was retrospectively analyzed. All of the tumor nodules measured less than 3 cm in diameter. Three-dimensional image reconstruction including muhiplanar reconstruction （MPR）, volume rendering （~R）, maximum intensity projection （MIP） was performed on all patients. The rates of tumor depiction for the three reconstructive methods were compared. Results Compared with cross sectional images, the display rates of cavitation or air bronehogram （68%）, bronchial obstruction or truncation （44%）, pleural indentation （90%）, tumor vascularity （63%） were significantly better on the 3-D reconstructed images （P〈0.05） whereas the display rates of lobulated （97%） and irregular （93%） margins of the lesions were no significantly different （P〉0.05）. Conclusion The morphology of primary small peripheral lung cancer is more clearly demonstrated on 320-detector-row CT with multiple 3-D reconstructive methods for imaging diagnosis.