title: Optimization of combined CT pulmonary angiography with lower extremity CT venography.
abstract: OBJECTIVE
  We wanted to determine the time delay for maximum enhancement of the deep venous system of the lower extremities after standard CT pulmonary angiography.
  
  
  METHODS
  In 20 patients who had undergone standard CT pulmonary angiography, we measured arterial and venous enhancement at the level of the greater trochanter. These measurements were obtained at 30-sec intervals immediately after completion of CT pulmonary angiography. Ten measurements were obtained in 5 min. Time-density curves were plotted.
  
  
  RESULTS
  We found that the median and average peak venous enhancements were 92 and 95 H, respectively. Time to peak enhancement was variable. Because of the broad shape of the venous time-density curve, near peak enhancement could be achieved in most patients at 2 min after CT pulmonary angiography.
  
  
  CONCLUSIONS
  CT of the deep venous system of the lower extremities after standard CT pulmonary angiography, performed with appropriate timing considerations, allows near maximal enhancement of the venous system in most patients without altering the optimum CT pulmonary angiography protocol.
authors.affiliation: Department of Radiology, New York Presbyterian Hospital-Weill Cornell Medical Center, NY 10023, USA.
authors.forename: D F
authors.initials: DF
authors.lastname: Yankelevitz
authors.forename: G
authors.initials: G
authors.lastname: Gamsu
authors.forename: A
authors.initials: A
authors.lastname: Shah
authors.forename: J
authors.initials: J
authors.lastname: Rademaker
authors.forename: D
authors.initials: D
authors.lastname: Shaham
authors.forename: N
authors.initials: N
authors.lastname: Buckshee
authors.forename: M D
authors.initials: MD
authors.lastname: Cham
authors.forename: C I
authors.initials: CI
authors.lastname: Henschke
mesh_terms: D005260:Female; D006801:Humans; D007866:Leg / Q000098:blood supply*; D008875:Middle Aged; D010690:Phlebography; D011651:Pulmonary Artery / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed