title: Usefulness of a saline flush for intravenous 3-dimensional computed tomography portography using multidetector-row helical computed tomography.
abstract: OBJECTIVE
  To evaluate the clinical usefulness of a saline flush technique in improving the imaging quality of 3-dimensional computed tomography portography (3D-CTP).
  
  
  METHODS
  To evaluate liver metastases, 58 patients were divided into 2 groups undergoing 3D-CTP with or without a saline flush. The computed tomography (CT) values of the right portal vein (RPV), left portal vein (LPV), main portal vein (MPV), and right hepatic parenchyma (RHP) were assessed. Maximum intensity projection (MIP) 3D-CTP images were evaluated by vessel visualization.
  
  
  RESULTS
  Higher mean CT attenuation values in the RPV, LPV, MPV, and RPV-RHP were observed in the saline flush group and were statistically significant (P = 0.04, P = 0.03, P = 0.01, and P = 0.04, respectively). The difference in imaging quality between 2 groups was statistically significant (P = 0.04). In segment VIII, the ability to depict the segmental branches was significantly higher when the saline flush technique was used (P = 0.03).
  
  
  CONCLUSIONS
  The saline flush technique increases the CT attenuation values of the portal vein and the difference in values between the portal vein and the tissue around it and improves the MIP imaging quality of 3D-CTP.
authors.affiliation: Department of Radiology, Kanazawa Medical University, Ishikawa, Japan. m-matoba@kanazawa-med.ac.jp
authors.forename: Munetaka
authors.initials: M
authors.lastname: Matoba
authors.forename: Tamaki
authors.initials: T
authors.lastname: Kondou
authors.forename: Hajime
authors.initials: H
authors.lastname: Yokota
authors.forename: Kotaro
authors.initials: K
authors.lastname: Higashi
authors.forename: Hisao
authors.initials: H
authors.lastname: Tonami
mesh_terms: D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007275:Injections, Intravenous / Q000379:methods; D007472:Iohexol; D008099:Liver / Q000000981:diagnostic imaging; D008102:Liver Circulation / Q000502:physiology; D008113:Liver Neoplasms / Q000175:diagnosis* / Q000556:secondary; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011169:Portal Vein; D011172:Portography / Q000379:methods; D011856:Radiographic Image Enhancement / Q000379:methods*; D012965:Sodium Chloride / Q000008:administration & dosage*; D036542:Tomography, Spiral Computed / Q000379:methods*
chemical_list: D003287:Contrast Media; D007472:Iohexol; D012965:Sodium Chloride