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目的：对支气管扩张的Ｘ线平片、ＣＴ和ＨＲＣＴ表现做一对比分析。方法：取病理证实支扩２０例，分别摄有胸正侧位片，常规ＣＴ扫描和ＨＲＣＴ扫描。ＨＲＣＴ选薄层，大矩阵和高分辨率算法。结果：显示Ｘ光平片漏诊率高（８／２０），特异性低（３／２０）。ＣＴ较平片显示肺“盲区”效果好，有粘液嵌塞者，常规ＣＴ像上有时不易与血管性病变鉴别，ＨＲＣＴ可显示部分含气的支气管腔存在。结论：ＨＲＣＴ扫描诊断支扩特异性高，可与支气管造影相媲美，它不仅显示支扩范围、程度和部位，还能显示小叶中央性改变。常规ＣＴ较平片显示率高。
OBJECTIVE: To make a comparative analysis of the manifestations of bronchiectasis radiographs, CT and HRCT. Methods: Twenty cases were confirmed by pathology. The posterior lateral radiographs were taken, routine CT scan and HRCT scan respectively. HRCT thin layer selection, large matrix and high-resolution algorithm. Results: X-ray showed a high rate of missed diagnosis (8/20) and low specificity (3/20). CT flatter lungs “blind spot” effect is good, there are mucus plug, conventional CT images sometimes difficult to identify with vascular lesions, HRCT can show the presence of some gas-containing bronchial lumen. Conclusion: HRCT scan has the advantages of high specificity of branch expansion and comparable with bronchography. It not only shows the extent, degree and location of branch and extension, but also shows the central change of leaflets. Conventional CT showed higher than the flat sheet.