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目的探讨MSCT最小密度投影(MinP)后处理技术在肺气肿诊断中的应用价值。方法搜集2013年4月至2014年9月在本院行胸部影像检查的710例患者的胸部X线平片和1.5 mm薄层CT资料。对全部病例的1.5 mm薄层CT图像行Min P重组,然后由两组医师行双盲法阅片,比较MinP重组后诊断率与X线平片及常规CT图像之间的差异。结果 710例中,X线平片诊断肺气肿99例,1.5 mm薄层CT诊断肺气肿134例,MinP重组诊断肺气肿325例。与MinP重组相比,X线平片假阳性27例,过诊率达7.0%(27/385),少诊253例,漏诊率达77.8%(253/325);1.5 mm薄层CT假阳性9例,过诊率达2.3%(9/385),少诊200例,漏诊率为61.5%(200/325)。结论 MinP后处理技术对肺气肿的显示率明显高于X线胸片和1.5 mm薄层CT,对肺气肿的早期诊断有价值。
Objective To investigate the value of MSCT MinP postprocessing in the diagnosis of emphysema. Methods Totally 710 chest radiographs and 1.5 mm thin-layer CT data of chest radiography from April 2013 to September 2014 were collected. Min P reconstruction was performed on 1.5 mm thin-layer CT images of all cases, and then double-blind readings were performed by two groups of doctors to compare the difference between MinP recombination diagnosis rate and plain radiography and conventional CT images. Results Of the 710 cases, 99 cases of emphysema were diagnosed by plain radiography, 134 cases of emphysema were diagnosed by 1.5 mm thin layer CT, and 325 cases of emphysema were diagnosed by MinP. Compared with MinP recombination, 27 cases were false positive on radiographs, with a diagnosis rate of 7.0% (27/385) and 253 cases (253/325), the false negative rate of 1.5 mm thin-section CT The diagnosis rate was 2.3% (9/385) in 9 cases, 200 cases were missed, the rate of misdiagnosis was 61.5% (200/325). Conclusion The display rate of MinP post-processing on emphysema is significantly higher than that of X-ray and 1.5-mm thin-layer CT, which is valuable for the early diagnosis of emphysema.