Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1985-02-15
1986-07-22
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324311, G01R 3320
Patent
active
046022147
ABSTRACT:
To produce image information from an object it is subjected to a continuous static magnetic field along a Z axis to sets of sequences of orthogonal gradients G.sub.x, G.sub.y and G.sub.z to the magnetic field. Spins in a selected plane (the X-Z plane) are excited by selective rf pulses and an associated G.sub.y gradient and the selected spins are subjected to all three gradients of which the G.sub.z gradient provides twist or warp to each column of spins extending along the Z axis to phase-encode the columns. The spin-echo signals are read out in the presence of a G.sub.x gradient. In each set of sequences a different value of Z gradient is employed. The Fourier transformed spin-echo signals obtained from each sequence, when arranged in order of increasing G.sub.z gradient and subjected to a second Fourier transform represent the distribution of spin density in the Z direction, thus giving a two-dimensional image of the selected X-Z plane.
REFERENCES:
patent: 4070611 (1978-01-01), Ernst
patent: 4165479 (1979-08-01), Mansfield
patent: 4290019 (1981-09-01), Hutchison et al.
patent: 4300096 (1981-11-01), Harrison et al.
patent: 4315216 (1982-02-01), Clow et al.
patent: 4339716 (1982-07-01), Young
Journal of Physics E-Scientific Instruments, vol. 13, No. 9, Published Sep. 1980, (London, GB), J. M. S. Hutchinson et al.: "A Whole-Body NMR Imaging Machine", See pp. 947-948 and Figure 1.
Lauterbur, "Image Formation by Induced Local Interactions: Examples Employing Nuclear Magnetic Resonance", Nature, vol. 242, Mar. 16, 1973, pp. 190-191.
Edelstein William A.
Hutchison James M. S.
Johnson Glyn
Mallard John R.
Redpath Thomas W. T.
Levy Stewart J.
National Research Development Corporation
O'Shea Kevin D.
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