title: Quantitation of localized (31)P magnetic resonance spectra based on the reciprocity principle.
abstract: There is a need for absolute quantitation methods in (31)P magnetic resonance spectroscopy, because none of the phosphorous-containing metabolites is necessarily constant in pathology. Here, a method for absolute quantitation of in vivo (31)P MR spectra that provides reproducible metabolite contents in institutional or standard units is described. It relies on the reciprocity principle, i.e., the proportionality between the B(1) field map and the map of reception strength for a coil with identical relative current distributions in receive and transmit mode. Cerebral tissue contents of (31)P metabolites were determined in a predominantly white matter-containing location in healthy subjects. The results are in good agreement with the literature and the interexamination coefficient of variance is better than that in most previous studies. A gender difference found for some of the (31)P metabolites may be explained by different voxel composition.
authors.affiliation: Department for Clinical Research, MR Spectroscopy and Methodology, University of Berne, CH-3010 Berne, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Kreis
authors.forename: J
authors.initials: J
authors.lastname: Slotboom
authors.forename: J
authors.initials: J
authors.lastname: Pietz
authors.forename: B
authors.initials: B
authors.lastname: Jung
authors.forename: C
authors.initials: C
authors.lastname: Boesch
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000328:Adult; D001921:Brain / Q000378:metabolism*; D005260:Female; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008297:Male; D008954:Models, Biological; D009243:NAD / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism; D010725:Phosphocreatine / Q000378:metabolism; D010743:Phospholipids / Q000378:metabolism; D010758:Phosphorus / Q000032:analysis*; D015203:Reproducibility of Results; D012737:Sex Factors
chemical_list: D010710:Phosphates; D010743:Phospholipids; D010725:Phosphocreatine; D009243:NAD; D010758:Phosphorus; D000255:Adenosine Triphosphate