多层螺旋CT肺血管造影不同重组间距在肺栓塞诊断中的应用

The Application of Pulmonary Angiography with Different Reconstruction Intervals in Diagnosis of Pulmonary Embolism Using Multi-slice CT

目的探讨多层螺旋CT血管造影(MSCTA)不同重组间距在肺动脉栓塞(pulmonary embolism,PE)中的诊断价值。资料与方法对36例经MSCTA检查的PE患者分别行10%、50%、70%横断位重叠重组,并将上述不同重组间距的横断位图像分别进行多平面重组(MPR)。比较不同重组间距的横断位图像及MPR图像对肺动脉栓子的显示情况。结果36例PE患者病变共累及肺动脉298支。对于主肺动脉及肺叶动脉栓塞,3种重组间距的横断位及对应的MPR图像栓子检出结果一致。但对于肺段及亚段动脉栓塞的显示,50%和70%重组间距的图像优于10%,差异有统计学意义(P<0.01),50%与70%重组间距的图像间差异无统计学意义(P>0.05)。结论MSCTA50%重组间距较10%重组间距的横断位图像能明显提高肺段、亚段PE的显示率,而进一步提高重组间距到70%意义不大。

Objective To investigate the diagnostic value of multi-slice CT angiography（MSCTA） with different reconstruction intervals in diagnosis of pulmonary embolism. Materials and Methods 36 patients with pulmonary embolism underwent MSCTA and the transverse images were reconstructed with 10%、50%、70% overlapping followed by MPR respectively.The manifestation ratio of pulmonary embolus in transverse and MPR images with different reconstruction intervals were compared. Results 298 pulmonary arteries were involved among 36 puhnonary embolism patients. Three different types of transverse and the coresponding MPR images had the same result for detecting the embolism of primary puhnonary artery and lobar arteries. For detecting the embolism of segmental arteries ,the images with 50% and 70ck overlapping were much better than images with 10% overlapping,and no significant difference was observed between images with 50% and 70% overlapping. Conclusion The transverse images with 50% overlapping can improve the manifestation ratio of segmental arteries embolism compared with images with 10% overlapping,and there is no need to increase the reconstruction interval to 70%.