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Spatial Localization in NMR Spectroscopy in Vivo

BOTTOMLEY, PAUL A.·1987·Annals of the New York Academy of Sciences

Abstract

Spatial localization techniques are necessary for in vivo NMR spectroscopy involving heterogeneous organisms. Localization by surface coil NMR detection alone is generally inadequate for deep-lying organs due to contaminating signals from intervening surface tissues. However, localization to preselected planar volumes can be accomplished using a single selective excitation pulse in the presence of a pulsed magnetic field gradient, yielding depth-resolved surface coil spectra (DRESS). Within selected planes, DRESS are spatially restricted by the surface coil sensitivity profiles to disk-shaped volumes whose radii increase with depth, notwithstanding variations in the NMR signal density distribution. Nevertheless, DRESS is a simple and versatile localization procedure that is readily adaptable to spectral relaxation time measurements by adding inversion or spin-echo refocusing pulses or to in vivo solvent-suppressed spectroscopy of proton (1H) metabolites using a combination of chemical-selective RF pulses. Also, the spatial information gathering efficiency of the technique can be improved to provide simultaneous acquisition of spectra from multiple volumes by interleaving excitation of adjacent planes within the normal relaxation recovery period. The spatial selectivity can be improved by adding additional selective excitation spin-echo refocusing pulses to achieve full, three-dimensional point resolved spectroscopy (PRESS) in a single excitation sequence. Alternatively, for samples with short spin-spin relaxation times, DRESS can be combined with other localization schemes, such as image-selected in vivo spectroscopy (ISIS), to provide complete gradient controlled three-dimensional localization with a reduced number of sequence cycles.

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Crossref · 10.1111/j.1749-6632.1987.tb32915.x

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Metadata

Authors
BOTTOMLEY, P. A.
Venue
Annals of the New York Academy of Sciences
Publisher
Wiley
Published
1987-11
Volume
508
Issue
1
Pages
333-348
ISSN
  • 0077-8923 (ISSN-L)
  • 1749-6632
OpenAlex
W2058027749
Cited by
1,378
References
9
FWCI
1.77
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Spatial Localization in NMR Spectroscopy in Vivo. https://app.cochat.ai/papers/10.1111/j.1749-6632.1987.tb32915.x
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BOTTOMLEY, P. A. (1987). Spatial Localization in NMR Spectroscopy in Vivo. Annals of the New York Academy of Sciences. https://doi.org/10.1111/j.1749-6632.1987.tb32915.x

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