| Zugriffsnummer | 37684 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Size-dependent MR relaxivities of magnetic nanoparticles |
| Autor(in); Institution |
Joos, A.; Zentralinstitut für Medizintechnik (IMETUM), Technische Universität München, Garching, GERMANY
Löwa, Norbert; 8.2, Biosignale, PTB-Berlin
Wiekhorst, Frank; 8.2, Biosignale, PTB-Berlin
Gleich, B.; Zentralinstitut für Medizintechnik (IMETUM), Technische Universität München, Garching, GERMANY
Haase, A.; Zentralinstitut für Medizintechnik (IMETUM), Technische Universität München, Garching, GERMANY
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| Quelle/Jahr | 11th International Conference on the Scientific and Clinical Applications of Magnetic Carriers. Journal of Magnetism and Magnetic Materials: 427 (2017), 122 - 126 |
| ISSN | 0304-8853 (PRINT) |
| DOI | |
| Verlag | North Holland: Elsevier |
| Konferenzangaben | 11th International Conference on the Scientific and Clinical Applications of Magnetic Carriers, Vancouver, 31, May, - 4, June, 2016, CANADA |
| Freie Schlagworte | Magnetic nanoparticles ; Quantitative imaging ; MR relaxometry ; Hydrodynamic fractionation ; Magnetic particle spectroscopy |
| Zusammenfassung | Magnetic nanoparticles (MNPs) can be used as carriers for magnetic drug targeting and for stem cell tracking by magnetic resonance imaging (MRI). For these applications, it is crucial to quantitatively determine the spatial distribution of the MNP concentration, which can be approached by MRI relaxometry. Theoretical considerations and experiments have shown that R2 relaxation rates are sensitive to the aggregation state of the particles, whereas R2* is independent of aggregation state and therefore suited for MNP quantification if the condition of static dephasing is met. We present a new experimental approach to characterize an MNP system with respect to quantitative MRI based on hydrodynamic fractionation. The first results qualitatively confirm the outer sphere relaxation theory for small MNPs and show that the two commercial MRI contrast agents Resovist® and Endorem® should not be used for quantitative MRI because they do not fulfill the condition for static dephasing. Our approach could facilitate the choice of MNPs for quantitative MRI and help clarifying the relationship between size, magnetism and relaxivity of MNPs in the future. |
