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目的评价多层螺旋CT(MSCT)的5 mm(厚层)和1.25 mm(薄层)层厚图像在诊断支气管扩张中的能力。方法回顾性分析200例在薄层MSCT上诊断为支气管扩张患者的影像学资料,其中男112例,女88例,平均年龄67.42岁,在肺叶、肺段水平及支气管扩张的范围、类型上比较薄层与厚层MSCT之间的诊断差异。所用设备为64排MSCT,扫描层厚5 mm,螺距0.94,并作1.25 mm薄层重组。采用χ2检验分析两者之间的差异。结果在200例薄层MSCT诊断为支气管扩张者中,厚层MSCT仅检出其中的153例(76.5%),两者有极显著差异(P=0.000);在1200个肺叶中,薄层MSCT检出437个(36.41%)肺叶有支气管扩张,而厚层MSCT仅检出284个(23.67%)肺叶,有极显著差异(P=0.000);在3600个肺段中薄层MSCT检出682个(18.94%)肺段有支气管扩张,而厚层MSCT检出459个(12.75%)肺段,有极显著差异(P=0.000);在支气管扩张范围级别上,厚、薄层在1级范围之间有显著差异,而在2、3级之间并无显著差异;厚层MSCT漏检的支气管扩张都是柱状支气管扩张。结论在检出局灶性、柱状支气管扩张的能力上薄层MSCT要显著高于厚层MSCT。
Objective To evaluate the ability of 5 mm (thick) and 1.25 mm (thin) layer thickness images of multi-slice spiral CT (MSCT) in the diagnosis of bronchiectasis. Methods The imaging data of 200 patients with bronchiectasis diagnosed by thin-section MSCT were retrospectively analyzed. There were 112 males and 88 females, with an average age of 67.42 years old. In terms of lung lobes and lung segments, the range and type of bronchiectasis Diagnostic differences between thin and thick MSCT. The equipment used was a 64-row MSCT with a 5 mm scanning layer thickness and a pitch of 0.94 and a 1.25 mm thin layer reorganization. Chi-square test was used to analyze the difference between the two. Results Of the 200 cases diagnosed as bronchodilators by thin-section MSCT, only 153 cases (76.5%) were detected by thick-layer MSCT. There was a significant difference between the two (P = 0.000) Bronchodilation was detected in 437 lungs (36.41%), while only 284 (23.67%) lung lobes were detected in the thick MSCT (P = 0.000); in 3600 lung segments, 682 (18.94%) had bronchiectasis in the lung segment, while 459 (12.75%) pulmonary segments were detected by the thick MSCT, with a significant difference (P = 0.000). In the range of bronchiectasis, There was a significant difference between the ranges, but there was no significant difference between grades 2 and 3. Bronchial dilatation of thick MSCT undetected was cylindrical bronchiectasis. Conclusions Thin MSCT was significantly higher than that of thick MSCT in detecting focal and columnar bronchiectasis.