title: Noninvasive evaluation of hepatic fibrosis in hepatitis C virus-infected patients using ethoxybenzyl-magnetic resonance imaging.
abstract: OBJECTIVE
  Liver biopsy is the gold standard test to determine the grade of fibrosis, but there are associated problems. Because gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid is secreted partially in hepatocytes and bile, it is possible that ethoxybenzyl-magnetic resonance imaging (EOB-MRI) correlates with liver function and liver fibrosis. The aim of this study was to compare the fibrosis seen in liver biopsy samples to the signal intensity of the hepatobiliary phase measured on EOB-MRI in hepatitis C virus (HCV)-infected patients.
  
  
  METHODS
  Two hundred twenty-four (estimation 149, validation 75) HCV-infected patients with histologically proven liver tissue who underwent EOB-MRI were studied. Overall, fibrosis staging was 15/24/19/46/45 for F0/F1/F2/F3/F4, respectively. A 1.5-Tesla magnetic resonance system was used, and the regions of interest of the liver were measured. Four methods were used: (i) relative enhancement: (post-enhanced signal intensity [SI] - pre-enhanced intensity)/pre-enhanced intensity; (ii) liver-to-intervertebral disk ratio (LI): post-enhanced (liver SI/interdisc SI)/pre-enhanced (liver SI/inter disc SI); (iii) liver-to-muscle ratio: post-enhanced (liver SI/muscle SI)/pre-enhanced (liver SI/muscle SI); and (iv) liver-to-spleen ratio: post-enhanced (liver SI/spleen SI)/pre-enhanced (liver SI/spleen SI).
  
  
  RESULTS
  To discriminate F0-1 versus F2-4 or F0-2 versus F3-4 or F0-3 versus F4, LI at 25 min (LI25) had the highest area under receiver operating characteristic (0.88, 0.87, and 0.87, respectively) in these four methods and also in the validation set.
  
  
  CONCLUSIONS
  LI at 25 min seems to be a useful method to determine the staging of fibrosis as a non-invasive method in HCV-infected hepatitis or cirrhosis patients.
authors: Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi, Japan. snojiri@med.nagoya-cu.ac.jp
authors: Shunsuke
authors: S
authors: Nojiri
authors: Atsunori
authors: A
authors: Kusakabe
authors: Kei
authors: K
authors: Fujiwara
authors: Noboru
authors: N
authors: Shinkai
authors: Kentaro
authors: K
authors: Matsuura
authors: Etsuko
authors: E
authors: Iio
authors: Tomokatsu
authors: T
authors: Miyaki
authors: Takashi
authors: T
authors: Joh
mesh_terms: D000368:Aged; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D019698:Hepatitis C, Chronic / Q000150:complications*; D006801:Humans; D008103:Liver Cirrhosis / Q000175:diagnosis* / Q000209:etiology*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male
chemical_list: D003287:Contrast Media; C073590:gadolinium ethoxybenzyl DTPA; D019786:Gadolinium DTPA