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Chemical shift imaging (CSI) by precise object displacement
Author(s) -
Leclerc Sebastien,
Trausch Gregory,
Cordier Benoit,
Grandclaude Denis,
Retournard Alain,
Fraissard Jacques,
Canet Daniel
Publication year - 2006
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1757
Subject(s) - chemistry , displacement (psychology) , amplitude , pulse sequence , sample (material) , analytical chemistry (journal) , chemical shift , nuclear magnetic resonance , optics , computational physics , physics , psychology , chromatography , psychotherapist
A mechanical device (NMR lift) has been built to displace vertically an object (typically an NMR sample tube) inside the NMR probe with an accuracy of 1 µm. A series of single pulse experiments are performed for incremented vertical positions of the sample. With a sufficiently spatially selective radio‐frequency (r.f.) field, one obtains chemical shift information along the displacement direction (one‐dimensional chemical shift imaging (CSI)). Knowing the vertical r.f. field profile (the amplitude of the r.f. field along the vertical direction), one can reconstruct the spectrum associated with all the slices corresponding to consecutive sample positions and improve the spatial resolution, which is simply related to the accuracy of the displacement device. Beside tests performed on phantoms, the method has been applied to solvent penetration in polymers and to benzene diffusion in a heterogeneous zeolite medium. Copyright © 2006 John Wiley & Sons, Ltd.