Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1982-02-03
1984-09-11
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324311, G01R 3308
Patent
active
044713061
ABSTRACT:
The T.sub.2 * effects due to inherent inhomogeneities in the static magnetic field are overcome by the use of a 180.degree. RF pulse to produce a nuclear spin echo suitable for obtaining spatial information and by the adjustment of the pulsed gradients such that the occurrence of the spin echo due to the applied gradients coincides with the occurrence of the nuclear spin echo derived from the rephasing of spins in the presence of the inhomogeneities inherent in the main static magnetic field. The 180.degree. RF pulse is applied with the imaging gradients turned off so that long RF pulse lengths can be used, thus reducing RF power requirements. Exemplary applications of the pulse method to multiple angle projection reconstruction and two-dimensional Fourier transform (spin warp imaging) imaging techniques are also described.
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Instrumentation for NMR Spin-Warp Imaging, by A. Johnson, T. M. S. Hutchinson, and L. M. Eastwood, in Journal of Physics E: Scientific Instruments, (Jan.), 1982.
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Bottomley Paul A.
Edelstein William A.
Cutter Lawrence D.
Davis Jr. James C.
General Electric Company
Kelley B. J.
Snyder Marvin
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