title: Digital subtraction versus film-screen angiography for detecting acute pulmonary emboli: evaluation in a porcine model.
abstract: OBJECTIVE
  To compare the diagnostic performance of digital subtraction angiography (DSA) to that of film-screen angiography (FSA) for detecting acute pulmonary embolism (PE) in a porcine model.
  
  
  METHODS
  DSA and FSA were performed in 13 pigs before and after central venous administration of autologous emboli. Results were compared to findings at necropsy with use of ex vivo pulmonary angiography to guide pathologic sectioning. The sensitivity and predictive value of a positive case for detecting each embolus were computed for each pulmonary artery branch order and compared with use of 95% confidence intervals. Interobserver variability among three readers for individual PE detection was calculated.
  
  
  RESULTS
  Pathologic examination of the lungs revealed 100 total PEs (location by vessel order: 1st = 1, 2nd = 0, 3rd = 15, 4th = 32, > 5th = 52). On average, FSA review identified 72 (72%) emboli and DSA review, 65 (65%). There was no significant difference in sensitivity or predictive value of a positive case between DSA and FSA for detecting emboli (P > .05). There was similar agreement among readers for individual PE detection with DSA (mean, 84%) and FSA (mean, 80%).
  
  
  CONCLUSIONS
  The diagnostic performance of DSA is equivalent to that of FSA for detecting emboli in porcine PA branches. Interobserver agreement for individual PE detection is similar for both imaging techniques.
authors.affiliation: Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors.forename: F J
authors.initials: FJ
authors.lastname: Schlueter
authors.forename: D A
authors.initials: DA
authors.lastname: Zuckerman
authors.forename: L
authors.initials: L
authors.lastname: Horesh
authors.forename: F R
authors.initials: FR
authors.lastname: Gutierrez
authors.forename: M E
authors.initials: ME
authors.lastname: Hicks
authors.forename: J A
authors.initials: JA
authors.lastname: Brink
mesh_terms: D000792:Angiography / Q000379:methods*; D015901:Angiography, Digital Subtraction; D000818:Animals; D016001:Confidence Intervals; D004195:Disease Models, Animal; D015588:Observer Variation; D011237:Predictive Value of Tests; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging* / Q000473:pathology; D012680:Sensitivity and Specificity; D013552:Swine; D014963:X-Ray Intensifying Screens