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目的比较不同重建层厚多层螺旋CT(MSCT)对肺动脉栓子的显示率及其诊断价值。方法对38例MSCT检查的肺栓塞患者分别行2.5 mm(组1)和1.25 mm(组2)横断面重叠重建,记录显示清楚的叶、段、亚段及第5级肺动脉内有无栓子,并行2χ检验。判定不同水平肺动脉分支内有无栓子的一致程度,计算к值。结果在叶、段、亚段肺动脉水平,栓子显示数占显示清楚肺动脉的比率,观察者1的组1和组2分别为38%和40%(P>0.05)、17%和21%(P<0.05)、1.7%和4.6%(P<0.05),观察者2的组1和组2分别为35%和37%(P>0.05)、16%和21%(P<0.05)、1.6%和4.2%(P<0.05)。叶、段、亚段肺动脉水平,观察者间的к值,组1分别为0.70、0.69、0.63,组2分别为0.78、0.86、0.70。结论MSCT 1.25 mm层厚重建图像能明显提高段、亚段肺动脉栓子的显示率和不同观察者间的一致程度,有重要诊断价值。
Objective To compare the display rate of pulmonary embolism with the value of multi-slice spiral CT (MSCT) with reconstruction thickness and its diagnostic value. Methods Thirty-eight patients with pulmonary embolism who underwent MSCT were overlapped and reconstructed with 2.5 mm (group 1) and 1.25 mm (group 2) cross-sections, respectively. The clear segments, segments, sub-segments and grade 5 pulmonary embolism , Parallel 2χ test. Determine the different levels of pulmonary artery branches in the presence of emboli consistency, calculate the value of к. RESULTS: In pulmonary, arterial and lobectomy groups, the percentage of pulmonary emboli showed clearly pulmonary arteries in group 1 and group 2, 38% and 40% respectively (P> 0.05), 17% and 21% (P <0.05), 1.7% and 4.6% (P <0.05), and those in observer 2 were 35% and 37% (P> 0.05), 16% and 21% % And 4.2% (P <0.05). Leaf, segment, sub-segment pulmonary artery level, the inter-observer value of к, group 1 were 0.70,0.69,0.63, group 2 were 0.78,0.86,0.70. Conclusion MSCT 1.25 mm reconstruction thickness images can significantly improve the segment, sub-segment pulmonary embolism display rate and the consistency between different observers, there is an important diagnostic value.