• Yan Zhang, Zhu-Hua Zhang, Zheng-Yu Jin, Hua-Dan Xue, Xiao-Na Zhang, Ji-Xiang Liang, Yun-Qing Zhang, Kai Xu, Bing Qi, Wen-Min Zhao, and Yun Wang.
• Department of Radiology, PUMC Hospital, CAMS and PUMC, Beijing 100730, China. zhtgr@163.com
• Zhongguo Yi Xue Ke Xue Yuan Xue Bao. 2009 Apr 1; 31 (2): 166-70.

ObjectiveTo explore the relationship of the perfusion defects in the dual-energy CT lung perfusion image and the filling defects in the CT pulmonary angiography (CTPA) in patients with acute pulmonary embolism.MethodsThe clinical data of 22 patients with acute pulmonary embolism were retrospectively analyzed. All of them underwent contrast CT scan in two phases using dual-energy CT: the first is pulmonary artery phase, and the second was performed immediately after the first phase using dual-energy scan covered the whole lung. Perfusion defects in the lung perfusion images were compared with the filling defects in the CTPA.ResultsComplete filling defects of segmental and subsegmental pulmonary arteries mostly showed correspondence perfusion defects in the CT perfusion map, accounting for 83% and 62% respectively. However, when there were partial or central filling defects, most of them were partial perfusion defects or normal in the CT perfusion map. Three segmental perfusion defects were depicted without the visualization of endoluminal thrombi within the corresponding arteries.ConclusionsThe perfusion defects in the CT lung perfusion image are not completely corresponding to the filling defects in the CTPA. The combination of CTPA and CT lung perfusion map will offer more information for the acute pulmonary embolism.

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