Objective To discuss CT scanning technology in pneumonoconiosis,and to determine the optimal scheme for the CT scanning of pneumonoconiosis. Methods Three scanning schemes of regular CT,thin-layer CT and HRCT were compared in 42 patients with pneumonoconiosis diagnosed by expert panel of pneumonoconiosis diagnosis. Results The detection cases of basic signs of pneumonoconiosis (small shadows,big shadows and PMF were 42 patients,21 patients and 13 patients respectively,and there was no significant difference (P>0.05).However,because of relatively more cross sections of lung markings shown in thin-layer CT and HRCT,they were easy to be misinterpreted as small shadows, which affected the judgment and staging of total density of small shadows of pneumonoconiosis.The early pulmonary in-terstitial fibrosis signs such as lobular emphysema and interlobular septal thickening detected by HRCT were signifi-cantly more than those detected by regular CT and thin-layer CT. Conclusion For CT scanning of pneumonoconiosis, the optimal scheme is the scanning with 8-10 mm layer thickness,and multiple thin-layer scanning and HRCT scanning in interested areas.%目的：探讨肺尘埃沉着病的CT扫描技术，确定肺尘埃沉着病CT扫描的最佳方案。方法对42例经肺尘埃沉着病诊断专家组确诊的肺尘埃沉着病患者的常规CT、薄层CT及高分辨率CT 3种扫描方案进行比较。结果3种扫描方案对肺尘埃沉着病的基本征像(小阴影、大阴影及斑块状肺纤维化)的检出例数分别为42、21、13例，差异无统计学意义(P>0.05)。但薄层CT及高分辨率CT由于显示肺纹理断面较多，易被认为小阴影，以致影响肺尘埃沉着病小阴影的总体密集度判断和分期。高分辨率CT对肺早期间质纤维化征象如小叶性肺气肿、小叶间隔增厚显示较常规CT及薄层CT显示明显增多。结论对于肺尘埃沉着病CT扫描以8~10 mm层厚扫描并对兴趣区进行数层薄层及高分辨率CT扫描为最佳扫描方案。
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