title: [Radiological features of dual-energy CT lung perfusion imaging in patients with acute pulmonary embolism: comparison with CT pulmonary angiography].
abstract: OBJECTIVE
  To 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.
  
  
  METHODS
  The 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.
  
  
  RESULTS
  Complete 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.
  
  
  CONCLUSIONS
  The 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.
authors.affiliation: Department of Radiology, PUMC Hospital, CAMS and PUMC, Beijing 100730, China. zhtgr@163.com
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhu-Hua
authors.initials: ZH
authors.lastname: Zhang
authors.forename: Zheng-Yu
authors.initials: ZY
authors.lastname: Jin
authors.forename: Hua-Dan
authors.initials: HD
authors.lastname: Xue
authors.forename: Xiao-Na
authors.initials: XN
authors.lastname: Zhang
authors.forename: Ji-Xiang
authors.initials: JX
authors.lastname: Liang
authors.forename: Yun-Qing
authors.initials: YQ
authors.lastname: Zhang
authors.forename: Kai
authors.initials: K
authors.lastname: Xu
authors.forename: Bing
authors.initials: B
authors.lastname: Qi
authors.forename: Wen-Min
authors.initials: WM
authors.lastname: Zhao
authors.forename: Yun
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000792:Angiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D055420:Perfusion Imaging / Q000379:methods*; D011651:Pulmonary Artery / Q000000981:diagnostic imaging; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D012189:Retrospective Studies; D015898:Tomography Scanners, X-Ray Computed; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult