目的 探讨双源CT双能量成像在 肺动脉栓塞诊断中的应用价值。方法 收 集在我院使用双源CT双能量肺动脉成像检 查的26例临床资料进行分析，探讨双源CT 双能量肺动脉成像(DEPI)在肺动脉栓塞中 的应用价值。结果 在肺叶基础上，DEPI 与CTPA检出血管栓塞的符合率为96.30%； 在肺段的基础上，DEPI与CTPA检出血管 栓塞的符合率为90.57%。当段、亚段肺动 脉栓塞充盈缺损完全时，DEPI表现为肺段 或亚段分布灌注缺损，当部分充盈缺损 时，DEPI以灌注降低为主，少数表现为 无灌注缺损；利用DEPI诊断PE的敏感性 96.30%(52/54)，特异性100%。结论 DEPI 表现与CTPA肺动脉栓塞程度、部位有关， 两者联合应用有助于提高肺动脉栓塞诊断 率,值得临床推广。

Objective To study the value of dual energy pulmonary angiography (DECTPA) with dual-source CT (DSCT) in pulmonary embolism (PE). Methods Collected the clinical data of 26 patients suspected of PE in our hospital underwent DECTPA with DSCT. Assessed the value of dual energy pulmonary angiography (DECTPA) with dualsource CT (DSCT) in pulmonary embolism (PE). Results The 96.30%, 90.57% agreement between DEPI and CTPA were showed in the levels of lung and partial lung respectively. Complete filling defects of segmental and subsegmental pulmonary arteries mostly showed correspon dence perfusion defects in the CT perfusion map. However, when there were partial filling defects, most of them were partial perfusion defects. A few of them were normal in the CT perfusion map. With CTPA as a reference standard,in the level o f lung, the results show that compared with DEPI, the sensitivity was 96.30% (52/54), specificity of 100% (76/76). Conclusion There was moderate agreement between the judgement of CTPA and DEPI. The perfusion defects in the DEPI related to the degree and location of the filling defects in the CTP A. The combination of CTPA and DEPI will offer more information for diagnosis of the pulmonary embolism. It is worth promotion in the clinical.