Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1990-08-13
1992-06-16
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
051227487
ABSTRACT:
Spatial localization of NMR signals is obtained by applying a selective 90.degree. RF pulse concurrently with a second order non-linear magnetic field gradient of the form x.sup.2 +y.sup.2 -2z.sup.2, and then applying a selective 180.degree. RF pulse concurrently with a linear magnetic field gradient in the z direction. The resulting spin-echo signal may be analyzed to perform volume-selected magnetic resonance spectroscopy. Spatially localized two-dimensional or three-dimensional magnetic resonance imaging may be accomplished using this spatial localization sequence together with an appropriate Fourier imaging sequence. Likewise, spatially localized one-dimensional, two-dimensional or three-dimensional chemical shift imaging may be obtained by applying one or more stepped phase encoding linear magnetic field gradients along the x, y and/or z directions. Further improvements are obtained in volume-selected magnetic resonance spectroscopy, and in spatially localized magnetic resonance imaging and chemical shift imaging by radial phase encoding using a stepped second order non-linear magnetic field gradient of the form x.sup.2 +y.sup.2 -2z.sup.2 applied after any form of selective excitation of a localized region and before the sampling of the NMR data. Three-dimensional spatial localization may be achieved with the application of a single selective RF pulse by applying such an RF pulse concurrently with appropriate oscillatory or non-uniformly stepped second order non-linear and linear magnetic field gradients.
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Hilal Sadek K.
Oh Chang-Hyun
The Trustees of Columbia University in the City of New York
Tokar Michael J.
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