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Sensitive-volume localization for in vivo NMR using heteronuclear spin-echo pulse sequences

✍ Scribed by M. Robin Bendall; David T. Pegg

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
549 KB
Volume
2
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

Heteronuclear spin‐echo techniques, which require the application of an inversion pulse on the second heteronucleus, may be applied with inhomogeneous rf coils such as surface coils. There are important applications in vivo including the detection of ^13^C‐ labeled and ^15^N‐labeled metabolites in the ^1^H NMR spectrum. Using a depth pulse scheme for the ^1^H spin‐echo sequence, and particular single or composite ^13^C pulses, two sensitive volumes are generated by the ^1^H and the ^13^C rf coils and signal is only obtained from the region of overlap between the two sensitive volumes. This method of signal localization for in vivo applications can be extended to ^1^H homonuclear editing and selective polarization‐transfer techniques. The off‐resonance characteristics of several different composite pulses are explored.

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