title: [Contrast agent enhanced duplex ultrasonography: visualization of the hepatic artery after orthotopic liver transplantation].
abstract: OBJECTIVE
  A prospective study was carried out to determine whether an improved assessment of the anatomy and flow velocity in the hepatic artery could be achieved by the administration of a capillary transversing contrast agent (Levovist) in patients after orthotopic liver transplantation.
  
  
  METHODS
  In 21 (62%) of 34 patients after liver transplantation, only an insufficient visualisation of the hepatic artery was achieved. Therefore, a capillary transversing contrast agent was administered intravenously. Pre- and post-contrast peak velocity and Doppler frequency shift in the proper hepatic artery were measured and image quality of colour and spectral Doppler was assessed by a qualitative scale.
  
  
  RESULTS
  Image quality, with complete visualisation of hepatic artery in 79% (precontrast 38%) of all cases, was significantly improved (p < 0.01 (Wilcoxon test)) by the administration of a contrast agent.
  
  
  CONCLUSIONS
  Visualisation of the hepatic artery after orthotopic liver transplantation can be improved by the administration of Levovist. It allows a reliable measurement of peak velocity and Doppler frequency shift and helps to avoid further imaging.
authors.affiliation: Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultät der Humboldt-Universität Berlin.
authors.forename: M
authors.initials: M
authors.lastname: Gutberlet
authors.forename: S
authors.initials: S
authors.lastname: Venz
authors.forename: R
authors.initials: R
authors.lastname: Neuhaus
authors.forename: T
authors.initials: T
authors.lastname: Ehrenstein
authors.forename: A J
authors.initials: AJ
authors.lastname: Lemke
authors.forename: T J
authors.initials: TJ
authors.lastname: Vogl
authors.forename: N
authors.initials: N
authors.lastname: Hosten
authors.forename: P
authors.initials: P
authors.lastname: Neuhaus
authors.forename: R
authors.initials: R
authors.lastname: Felix
mesh_terms: D000328:Adult; D003287:Contrast Media; D005069:Evaluation Studies as Topic; D005260:Female; D006499:Hepatic Artery / Q000000981:diagnostic imaging*; D006801:Humans; D007089:Image Enhancement; D016031:Liver Transplantation; D008297:Male; D008875:Middle Aged; D011134:Polysaccharides; D011446:Prospective Studies; D018616:Ultrasonography, Doppler, Duplex / Q000379:methods
chemical_list: D003287:Contrast Media; D011134:Polysaccharides; C059891:SHU 508