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A
B
Figure 7. Schematic view of longitudinal magnetization components after the application of a 90° rf pulse. The longitudinal component
M z recovers to equilibrium value through an exponential process (A); Longitudinal relaxation time T1 at which the M z recovers to 63% of
its equilibrium value (B) [82] (reprinted with permission from IOP Publishing, Ltd)
Figure 8. Schematic view of transverse magnetization components after the application of a 90° rf pulse. The transverse component
M xy decays to 37% of its initial value. The observed T2* relaxation time as a result of local field non-uniformities [81]
MNPs as contrast agents in NMR-based applications
In NMR-based applications, T1, T2, and T2* are used as metrics. Nowadays, NMR has been widely used
for determining the structures of organic compounds and biomolecules as well as in magnetic resonance
