New PDF release: NMR Imaging of Materials

By Bernhard Blümich

ISBN-10: 019850683X

ISBN-13: 9780198506836

This booklet offers an creation to NMR imaging of fabrics protecting solid-state NMR spectroscopy, imaging equipment for liquid and good samples, and strange NMR when it comes to certain ways to spatial solution like an NMR floor scanner. precise cognizance is dedicated to the massive number of how one can generate picture distinction in order that positive factors invisible by way of different tools could be detected via NMR. It comprises broad references to fashionable literature and addresses employees in a variety of fields of imaging purposes in addition to scholars.

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In particular, superior contrast can be achieved in soft matter by NMR imaging. For X-rays, the signal attenuation at the given frequency is the only source of contrast available. For this reason, the use of contrast agents has become common practice in X-ray tomography. 5 Contrast in NMR imaging In NMR, the image contrast is determined not only by the density of the observed nucleus, but also by the numerous other parameters which are measured in NMR spectroscopy to determine the molecular characteristics of condensed matter [Blu1O, Blu l 1, Xial].

1 M A G N E T I C F I E L D S In NMR spectroscopy, the polarizing magnetic field is required to be highly homogeneous, that is, constant over the sample. In NMR imaging, the polarizing field needs to be inhomogeneous. In most cases, the inhomogeneous part of the field is linearly dependent on space, so that the field gradient is constant. This space-dependent part of the field is often referred to as the gradient field. It introduces spatial resolution to the NMR experiment. Typically, it is generated by a separate set of current-bearing coils.

7) in terms of an attenuated precession of the transverse magnetization around the direction of the magnetic field in a given volume cell, or voxel, in the 3D case, or a picture cell, or pixel, in the 2D case, Here T2 is the effective transverse relaxation time, and the Larmor frequency WL is taken to be time dependent in order to account for effects of slow molecular motion as well as for the effects of time-dependent magnetic field gradients. The initial magnetization before the 90° excitation pulse at t = 0 is taken to be Mz which can be different from the thermodynamic equilibrium value MO as a result of incomplete relaxation or the use of a filter for longitudinal magnetization.

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NMR Imaging of Materials by Bernhard Blümich

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