title: Spatial relationship between intrahepatic artery and portal vein based on the fusion image of CT-arterial portography (CTAP) and CT-angiography (CTA): new classification for hepatic artery at hepatic hilum and the segmentation of right anterior section of the liver.
abstract: OBJECTIVE
  To clarify the variations of the intrahepatic artery and portal vein and to verify the proper segmentation for the right anterior section of the liver.
  
  
  METHODS
  CT during arterial portography and CT angiography were performed on 64-slice multi detector row CT in 147 patients. All images were transferred to a workstation for analysis using multi-image-fusion mode. We investigated the spatial relationship between hepatic artery and portal vein in the right hemiliver and the segmentation of the right anterior hepatic artery and portal vein.
  
  
  RESULTS
  The spatial anatomy of right hepatic arteries and portal vein was (1) anterior and posterior hepatic artery run superior and inferior to anterior portal vein, respectively (47.6%), (2) one anterior hepatic artery runs superior to and another one runs inferior to anterior portal vein (15%), (3) anterior and posterior hepatic arteries run superior to anterior portal vein (11.6%), (4) anterior and posterior hepatic arteries run inferior to anterior portal vein (7.5%), and (5) one posterior hepatic artery runs superior to and another one runs inferior to anterior portal vein (6.8%). The combined anatomy of right anterior artery and portal vein with regard to segmentation was classified as (1) dorso-ventral (26.5%), (2) dorso-ventral and inferior (10.9%), (3) multiple (18.4%), and (4) superior and inferior segments (1.4%).
  
  
  CONCLUSIONS
  There are various types of spatial anatomy of intrahepatic artery and portal vein. The hepatic arteries as well as portal veins of right anterior section of the liver could be divided into dorsal and ventral, not superior and inferior.
authors.affiliation: Mitsui Memorial Hospital, Department of Radiology, 1-Kanda Izumicho Chiyoda-ku, Tokyo 101-8643, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Ibukuro
authors.forename: Takaya
authors.initials: T
authors.lastname: Takeguchi
authors.forename: Hozumi
authors.initials: H
authors.lastname: Fukuda
authors.forename: Shoko
authors.initials: S
authors.lastname: Abe
authors.forename: Kimiko
authors.initials: K
authors.lastname: Tobe
authors.forename: Rei
authors.initials: R
authors.lastname: Tanaka
authors.forename: Kazumi
authors.initials: K
authors.lastname: Tagawa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D005260:Female; D006499:Hepatic Artery / Q000000981:diagnostic imaging*; D006801:Humans; D008099:Liver / Q000098:blood supply* / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000000981:diagnostic imaging*; D011172:Portography / Q000379:methods*; D011856:Radiographic Image Enhancement / Q000379:methods; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013382:Subtraction Technique