title: Clinical evaluation of magnetic resonance imaging flowmetry of portal and hepatic veins in patients following hepatectomy.
abstract: BACKGROUND
  Hepatic blood flow was associated with degree of hepatic damage. Measurements of blood flow using ultrasonography (US) may vary due to any observer's and patient's conditions. The utility of magnetic resonance imaging (MRI) flowmetry in portal and hepatic veins was assessed.
  
  
  METHODS
  Using the phase-contrast method, the mean flow velocity of portal (PVF) and hepatic vein (HVF) were determined by MRI and US in 75 consecutive patients with liver diseases, including 58 patients undergoing hepatectomy. The correlations between these parameters and clinicopathological findings were examined.
  
  
  RESULTS
  PVF and HVF measured by MRI flowmetry were 12.8+/-4.5 and 14.7+/-5.3 cm/s, respectively. There was no significant correlation of both flows between MRI and US. PVF correlated significantly with portal pressure (r = -0.722; P < 0.05). There was a negative correlation between HVF and histological activity index score (r = -0.366; P < 0.05). PVF and HVF were lower in patients with cirrhosis and higher staging score (2-4) and PVF was lower in patients with higher grading score (2-3; P < 0.05). PVF and HVF were not significantly associated with postoperative complications.
  
  
  CONCLUSIONS
  Our results suggest that MRI flowmetry is a potentially useful tool for measurement of hepatic blood flow and recommend its use for estimation of liver cirrhosis-associated impairment.
authors.affiliation: Division of Surgical Oncology, Department of Translational Medical Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan. a-nanasm@net.nagasaki-u.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Nanashima
authors.forename: S
authors.initials: S
authors.lastname: Shibasaki
authors.forename: I
authors.initials: I
authors.lastname: Sakamoto
authors.forename: E
authors.initials: E
authors.lastname: Sueyoshi
authors.forename: Y
authors.initials: Y
authors.lastname: Sumida
authors.forename: T
authors.initials: T
authors.lastname: Abo
authors.forename: T
authors.initials: T
authors.lastname: Nagasaki
authors.forename: T
authors.initials: T
authors.lastname: Sawai
authors.forename: T
authors.initials: T
authors.lastname: Yasutake
authors.forename: T
authors.initials: T
authors.lastname: Nagayasu
mesh_terms: D000368:Aged; D001783:Blood Flow Velocity; D005260:Female; D005355:Fibrosis / Q000503:physiopathology; D006498:Hepatectomy / Q000009:adverse effects*; D006503:Hepatic Veins / Q000502:physiology*; D006801:Humans; D008107:Liver Diseases / Q000175:diagnosis / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000379:methods* / Q000592:standards; D008297:Male; D008875:Middle Aged; D011169:Portal Vein / Q000502:physiology*; D011183:Postoperative Complications; D012189:Retrospective Studies; D018608:Ultrasonography, Doppler / Q000592:standards