title: [Dual phase spiral CT in hepatic hilar masses].
abstract: OBJECTIVE
  To develop optimal parameters for dual-phase spiral CT and to test it in hepatic hilar processes.
  
  
  METHODS
  15 patients without and 20 patients with suspected hhp underwent dual-phase spiral CT. Maximum intensity projections (MIPs) of arterial and portal venous phase were calculated for assessment of relation between hhp and hepatic hilar vessels.
  
  
  RESULTS
  Optimal parameters were: 150 ml contrast material with 4 ml/s, 20-s delay, 24-s spiral duration, 5 mm slice thickness, 7-8 mm/s table speed, 2 mm reconstruction increment. The localisation and spread of hhp could be optimally estimated on axial scans. Various hhp showed a different type of enhancement. 12 of 20 lesions caused an alteration of hepatic vessels.
  
  
  CONCLUSIONS
  Dual-phase spiral CT is valuable in characterising and assessing spread and operability of hhp. The calculation of MIPs should be performed only when preparing an operation.
authors.affiliation: Klinik und Poliklinik für Diagnostische Radiologie, Universität Leipzig.
authors.forename: C
authors.initials: C
authors.lastname: Stietzel
authors.forename: S
authors.initials: S
authors.lastname: Kösling
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006499:Hepatic Artery / Q000000981:diagnostic imaging*; D006801:Humans; D008099:Liver / Q000000981:diagnostic imaging*; D008107:Liver Diseases / Q000000981:diagnostic imaging*; D008113:Liver Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000000981:diagnostic imaging*; D012016:Reference Values; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*
vernacular_title: Zweiphasen-Spiral-CT bei hilusnahen Leberprozessen.