Magnetization transfer (MT), in NMR and MRI, refers to the transfer of nuclear spin polarization and/or spin coherence from one population of nuclei to another population of nuclei, and to techniques that make use of these phenomena.[1] There is some ambiguity regarding the precise definition of magnetization transfer, however the general definition given above encompasses all more specific notions. NMR active nuclei, those with non-zero spin, can be energetically coupled to one another under certain conditions. The mechanisms of nuclear-spin energy-coupling have been extensively characterized and are described in the following articles: Angular momentum coupling, Magnetic dipole–dipole interaction, J-coupling, Residual dipolar coupling, Nuclear Overhauser effect, Spin–spin relaxation, and Spin saturation transfer. Alternatively, some nuclei in a chemical system are labile and exchange between non-equivalent environments. A more specific example of this case is presented in the section Chemical Exchange Magnetization transfer.
In either case, magnetization transfer techniques probe the dynamic relationship between two or more distinguishable nuclei populations, in so far as energy exchange between the populations can be induced and measured in an idealized NMR experiment.
^Rodríguez-Rodríguez, Aurora; Zaiss, Moritz; Esteban-Gómez, David; Angelovski, Goran; Platas-Iglesias, Carlos (2021). "Chapter 4. Metal Ion Complexes in Paramagnetic Chemical Exchange Saturation Transfer (ParaCEST)". Metal Ions in Bio-Imaging Techniques. Springer. pp. 101–135. doi:10.1515/9783110685701-010. S2CID 233710016.
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