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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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Concepts of spatial resolution

Concepts of spatial resolution

(p.144) 5 Concepts of spatial resolution
NMR Imaging of Materials

Bernhard Blümich

Oxford University Press

Various methods have been proposed for generation of images by nuclear magnetic resonance (NMR). However, only the variants of the Fourier technique are used on a routine basis in clinical imaging. It is helpful to classify the imaging techniques by the dimension of the region which produces the acquired signal. Then point, line, plane, and volume techaiqnes are discriminated. To optimise sensitivity, it is advantageous to multiplex the space information during data acquisition, so that the acquired signal derives from as many pixels or voxels simultaneously as possible. This chapter reviews concepts of spatial resolution and discusses the less sensitive sensitive-point method and line-scan methods. A reduction of the space dimensions of the NMR signal can be achieved by the use of selective excitation in the presence of field gradients, for instance, by selective pulses. This chapter also considers shaped pulses, composite pulses, pulse sequences, solid-state techniques, magnetisation in field gradients, linear and nonlinear responses.

Keywords:   spatial resolution, nuclear magnetic resonance imaging, sensitive-point method, line-scan methods, selective excitation, shaped pulses, pulse sequences, magnetisation, nonlinear responses, solid-state techniques

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