Methods of producing image formation from objects

Details Methods of producing image formation from objects Methods of producing image formation from objects

1986-06-27

1987-11-10

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324311, G01R 3320

Patent

active

047060255

ABSTRACT:
To produce image information from an object it is subjected to a continuous static magnetic field along a Z axis and 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: 4506222 (1985-03-01), Edelstein et al.
patent: 4602214 (1986-07-01), Edelstein et al.
Lai et al., "Nuclear Magnetic Resonance Zeugmatography for Medical Imaging", Electro/78 Conference Record (1978) pp. 1-15.

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