title: Relationship of 31P MR spectroscopy to the histopathological grading of chronic hepatitis and response to therapy.
abstract: OBJECTIVE
  In vivo phosphorus-31 MR spectroscopy (31P MRS) was performed in the human liver in order to investigate the relation between: the ratios of phosphorus metabolites in the liver; the histopathological grading of chronic hepatitis; and the response to therapy.
  
  
  METHODS
  Hepatic 31P MRS using the DRESS method (depth-resolved surface-coil spectroscopy) was carried out in 45 patients with chronic viral hepatitis or autoimmune hepatitis, and in 16 control subjects. We measured the ratios of the peak areas of phosphomonoesters (PME), inorganic phosphate (Pi), or phosphodiesters (PDE) to the peak area of beta-adenosine triphosphate (ATP).
  
  
  RESULTS
  The PDE/ATP ratio of patients with chronic hepatitis or liver cirrhosis was lower than that of control subjects (liver cirrhosis = 0.74; chronic active hepatitis = 1.13-1.21; normal = 1.43); only a small difference was found in the PME/ATP and Pi/ATP ratios. There was no correlation between the spectra and histopathological grading or response to therapy, but the response to therapy was poor when a reduced PDE/ATP ratio was present.
  
  
  CONCLUSIONS
  The PDE/ATP ratio measured by 31P MRS makes it possible to identify the transition of chronic active hepatitis into liver cirrhosis with a poor response to therapy.
authors.affiliation: Department of Radiology, Shinshu University School of Medicine, Matsumoto, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kiyono
authors.forename: A
authors.initials: A
authors.lastname: Shibata
authors.forename: S
authors.initials: S
authors.lastname: Sone
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
authors.forename: M
authors.initials: M
authors.lastname: Oguchi
authors.forename: N
authors.initials: N
authors.lastname: Shikama
authors.forename: T
authors.initials: T
authors.lastname: Ichijo
authors.forename: K
authors.initials: K
authors.lastname: Kiyosawa
authors.forename: T
authors.initials: T
authors.lastname: Sodeyama
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000293:Adolescent; D000328:Adult; D000368:Aged; D001706:Biopsy; D019693:Hepatitis, Autoimmune / Q000175:diagnosis / Q000473:pathology; D006521:Hepatitis, Chronic / Q000175:diagnosis* / Q000378:metabolism / Q000473:pathology; D006801:Humans; D008099:Liver / Q000378:metabolism / Q000473:pathology*; D009682:Magnetic Resonance Spectroscopy; D008875:Middle Aged; D010755:Organophosphates / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism*
chemical_list: D010755:Organophosphates; D010710:Phosphates; D010758:Phosphorus; D000255:Adenosine Triphosphate