title: [Qualitative control over quantitative MR tomography: in vitro and in vivo checks on relaxation time measurements].
abstract: In-vivo and in-vitro checks on measurements of relaxation times in MRI have been carried out as part of quality control. For the in-vitro experiments we used 13 reagents consisting of varying concentrations of copper sulphate manganese sulphate, gadolinium solutions and various oils as well as water. For in-vivo measurements we used liver parenchyma and fat in three subjects. Eight different sequences were performed; intra- and interindividual variations and comparison of three similar MRI units showed average variations of 2-3% for T1 and 3-4% variations for T2 relaxation times. This margin of error makes quantitative MRI acceptable for clinical use.
authors.affiliation: Radiologische Klinik, Universität Bonn.
authors.forename: A
authors.initials: A
authors.lastname: Steudel
authors.forename: F
authors.initials: F
authors.lastname: Träber
authors.forename: T
authors.initials: T
authors.lastname: Krahe
authors.forename: O
authors.initials: O
authors.lastname: Schiffmann
authors.forename: T
authors.initials: T
authors.lastname: Harder
mesh_terms: D000293:Adolescent; D000328:Adult; D003287:Contrast Media; D006801:Humans; D008099:Liver / Q000033:anatomy & histology; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods / Q000592:standards*; D008297:Male; D008961:Models, Structural; D011786:Quality Control; D013997:Time Factors
chemical_list: D003287:Contrast Media
vernacular_title: Qualitätskontrolle der quantitativen MR-Tomographie: In-vitro- und In-vivo-Uberprüfung von Relaxationszeitmessungen.