title: Frequency of common bile duct motion artifacts caused by inferior vena cava pulsation on magnetic resonance cholangiopancreatography.
abstract: OBJECTIVE
  We assessed the frequency of common bile duct (CBD) motion artifacts caused by inferior vena cava (IVC) pulsation on magnetic resonance cholangiopancreatography (MRCP).
  
  
  METHODS
  We retrospectively evaluated CBD motion artifacts in 4 MRCP sequences from each of 115 consecutive patients.
  
  
  RESULTS
  We observed 37 (32.2%) ghost artifacts at the ventral and dorsal aspects of the CBD on transaxial, half-Fourier acquisition single-shot turbo spin-echo (HASTE-ax) images; no such artifacts were observed on transaxial T(2)-weighted turbo spin-echo images. In 10 patients, we observed 9 (7.8%) pseudo-defects of the CBD on 3-dimensional T(2)-weighted turbo spin-echo with navigator-triggered prospective acquisition correction technique MRCP and 6 (5.2%) pseudo-defects on single-shot rapid acquisition with relaxation enhancement MRCP. Pseudo-defects were significantly more frequent in patients with ghost artifacts than without (9 of 37 [24.3%] versus one of 78 [1.3%]; P<0.01, McNemar test).
  
  
  CONCLUSIONS
  Although uncommon, pseudo-defects of the CBD caused by IVC pulsation are observed on MRCP. MRCP interpretation that includes comparison with HASTE-ax images can diminish the potential misinterpretation of such CBD motion artifact as bile duct tumor or biliary stone.
authors.affiliation: Department of Radiology, Tokyo Women's Medical University, Medical Center East, Tokyo, Japan. i@imodey.com
authors.forename: Satoru
authors.initials: S
authors.lastname: Morita
authors.forename: Eiko
authors.initials: E
authors.lastname: Ueno
authors.forename: Naoko
authors.initials: N
authors.lastname: Saito
authors.forename: Kazufumi
authors.initials: K
authors.lastname: Suzuki
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Machida
authors.forename: Mikihiko
authors.initials: M
authors.lastname: Fujimura
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Maruyama
authors.forename: Yugo
authors.initials: Y
authors.lastname: Onodera
authors.forename: Kunihiro
authors.initials: K
authors.lastname: Watanabe
authors.forename: Takashi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ohnishi
authors.forename: Chiaki
authors.initials: C
authors.lastname: Imura
authors.forename: Norio
authors.initials: N
authors.lastname: Mitsuhashi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016477:Artifacts; D001660:Biliary Tract Diseases / Q000175:diagnosis*; D049448:Cholangiopancreatography, Magnetic Resonance / Q000379:methods*; D003135:Common Bile Duct / Q000473:pathology*; D003287:Contrast Media / Q000008:administration & dosage; D005260:Female; D005290:Ferric Compounds / Q000008:administration & dosage; D005583:Fourier Analysis; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008875:Middle Aged; D009038:Motion; D015588:Observer Variation; D010182:Pancreatic Diseases / Q000175:diagnosis*; D011673:Pulsatile Flow / Q000502:physiology; D012189:Retrospective Studies; D014682:Vena Cava, Inferior / Q000502:physiology*
chemical_list: D003287:Contrast Media; C120852:FerriSeltz; D005290:Ferric Compounds