Extending the excitation sculpting concept for selective excitation |
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Authors: | Roumestand C Canet D |
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Affiliation: | Centre de Biochimie Structurale, CNRS-UMR 9955, INSERM-U414, Faculté de Pharmacie, Université de Montpellier I, 15 Avenue Charles Flahault, 34060 Montpellier Cedex 1, France. roume@cbs.univ-montp1.fr |
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Abstract: | Nowadays, excitation sculpting is probably the most efficient way to achieve selectivity in an NMR experiment, since it associates very clean frequency selection with "user-friendliness." In the present report, it is shown that the excitation sculpting concept, originally based on a double pulse field gradient echo acting on a selected transverse magnetization, can be extended through new experiments designed to act on longitudinal magnetization. This leads to outstanding performances, especially when the transverse relaxation rate is a limiting factor as, for example, in the case of biological macromolecules. Several new sequences are proposed, aiming at the selection of magnetization aligned either/both on a transverse axis or/and on the z-axis. Their potentialities are illustrated in light of different applications including multiplet-selective excitation, band-selective excitation, and water suppression. |
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Keywords: | excitation sculpting selective excitation water suppression |
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