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NMR Imaging of Materials$
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Bernhard Blumich

Print publication date: 2003

Print ISBN-13: 9780198526766

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198526766.001.0001

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Spatially resolved NMR

Spatially resolved NMR

(p.378) 9 Spatially resolved NMR
NMR Imaging of Materials

Bernhard Blümich

Oxford University Press

Spatially resolved nuclear magnetic resonance (NMR) refers to the measurement of spectra, relaxation times, and other NMR parameters from within a small region of a large object. It can be considered the limiting case of imaging, where NMR information is acquired for each volume element. In spatially resolved NMR, just one or in some cases a few volume elements are considered. The methodical challenge is posed by the selection of the signal from the volume element in question. This can be done in two major ways. One approach exploits selective excitation in combination with gradients for preparation of the initial magnetisation in the volume element in question, which is then subject to further investigation by NMR. Because the use of gradients is inherent to this approach, localisation techniques based on this principle are referred to as gradient methods. Alternatively, the volume upon which the excitation acts and from which the NMR signal is received can be reduced by shaping the transmitter and receiver coils, respectively. Consequently, the second approach encompasses surface-coil methods.

Keywords:   imaging, gradient methods, surface-coil methods, surface coils, volume elements, selective excitation, magnetisation

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