title: Common bile duct anteroposterior movement synchronized with inferior vena cava pulsation observed by cine magnetic resonance imaging.
abstract: OBJECTIVE
  To reveal the phenomenon of common bile duct (CBD) anteroposterior movement caused by inferior vena cava (IVC) pulsation depending on the cardiac cycle using cine magnetic resonance imaging.
  
  
  METHODS
  A breath-hold trans-axial cine segmented true fast imaging with steady-state precession (trueFISP) sequence was prospectively performed on 11 healthy volunteers to observe CBD anteroposterior movement and IVC pulsation during the cardiac cycle. Changes in IVC anterior-posterior diameter and CBD location were compared using Pearson rank correlation analysis.
  
  
  RESULTS
  Nine (81.8%) of 11 CBDs moved back and forth in synchronicity with IVC anterior wall motion depending on the cardiac cycle; the mean maximum and minimum IVC diameters were 16.2+/-2.7 and 12.9+/-3.1 mm, respectively. Two (18.2%) of 11 CBDs and IVC walls did not move; the mean unchanged IVC diameter was 5.3+/-2.1 mm. There were significant correlations between the mean change in IVC diameter and distance of CBD anteroposterior movement (2.7+/-2.1 and 1.8+/-1.4 mm, respectively, r=0.911, P<.05).
  
  
  CONCLUSIONS
  Many CBDs move back and forth in synchronicity with IVC pulsation depending on the cardiac cycle.
authors.affiliation: Department of Radiology, Tokyo Women's Medical University Medical Center East, 2-1-10 Nishiogu, Arakawa-ku, Tokyo 116-8567, Japan. i@imodey.com
authors.forename: Satoru
authors.initials: S
authors.lastname: Morita
authors.forename: Naoko
authors.initials: N
authors.lastname: Saito
authors.forename: Kazufumi
authors.initials: K
authors.lastname: Suzuki
authors.forename: Norio
authors.initials: N
authors.lastname: Mitsuhashi
mesh_terms: D000328:Adult; D003135:Common Bile Duct / Q000502:physiology*; D005260:Female; D006801:Humans; D019028:Magnetic Resonance Imaging, Cine / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009068:Movement; D011446:Prospective Studies; D011673:Pulsatile Flow; D014682:Vena Cava, Inferior / Q000502:physiology*