𝔖 Bobbio Scriptorium
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Chemical shift imaging (CSI) by precise object displacement

✍ Scribed by Sebastien Leclerc; Gregory Trausch; Benoit Cordier; Denis Grandclaude; Alain Retournard; Jacques Fraissard; Daniel Canet

Book ID
102524738
Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
281 KB
Volume
44
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

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.

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