title: Understanding the discrepancies between 31P MR spectroscopy assessed liver metabolite concentrations from different institutions.
abstract: The high divergence between the liver metabolite concentrations and pH values reported in previous quantitative 31P magnetic resonance studies, for instance phosphomonoester (0.7-3.8 mM) and phosphodiester (3.5-9.7 mM), has not been addressed in the literature. To assess what level of discrepancy can be caused by processing and metabolite integration, in this study chemical shift imaging localized 31P magnetic resonance spectra of human liver were quantitated by three methods currently applied in clinical practice: peak areas defined manually by placement of two cursors vs. frequency domain curve fitting with the assumption of either Gaussian or Lorentzian line shapes. Large reproducible differences were found in liver metabolite peak areas but not in pH, indicating that processing and peak integration methods can only explain part of the discrepancies between the results from different institutions.
authors.affiliation: Department of Radiology, Dr. Daniel den Hoed Cancer Center, University Hospital Rotterdam, The Netherlands. sijens@radh.azr.nl
authors.forename: P E
authors.initials: PE
authors.lastname: Sijens
authors.forename: P C
authors.initials: PC
authors.lastname: Dagnelie
authors.forename: S
authors.initials: S
authors.lastname: Halfwerk
authors.forename: P
authors.initials: P
authors.lastname: van Dijk
authors.forename: K
authors.initials: K
authors.lastname: Wicklow
authors.forename: M
authors.initials: M
authors.lastname: Oudkerk
mesh_terms: D000255:Adenosine Triphosphate / Q000032:analysis; D000328:Adult; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008099:Liver / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008875:Middle Aged; D010758:Phosphorus / Q000032:analysis; D015203:Reproducibility of Results
chemical_list: D010758:Phosphorus; D000255:Adenosine Triphosphate