Method and apparatus for rapid NMR imaging of nuclear densities

Details Method and apparatus for rapid NMR imaging of nuclear densities Method and apparatus for rapid NMR imaging of nuclear densities

1980-02-12

1982-03-02

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01N 2700

Patent

active

043180434

ABSTRACT:
Densities of resonant nuclei within elemental volumes along a line are measured using the nuclear magnetic resonance phenomenon called "spin echo". A first planar volume of nuclei is selectively excited to nutate spins by approximately 90.degree.. Thereafter a second planar volume of nuclei, transverse to the first planar volume, is selectively excited to nutate spins by approximately 180.degree.. The nuclei in the line volume common to both of the planar volumes thereafter generate characteristic spin echo signals. A magnetic gradient is established along this line volume during the spin echo read out so that the resultant spin echo signals can be processed to determine the respective densities of resonant nuclei along the line volume. Appropriate phasing of the excitations enables interference with the spin echo signals by the free induction decay to be eliminated. To enable rapid development, successive line volumes are read out which do not lie in previously excited planes.

REFERENCES:
patent: 3812418 (1974-05-01), Tschopp
patent: 3932805 (1976-01-01), Abe
patent: 4015196 (1977-03-01), Moore
patent: 4021726 (1977-05-01), Garroway
patent: 4070611 (1978-01-01), Ernst
patent: 4087738 (1978-05-01), Van Degrift
patent: 4095168 (1978-06-01), Hlavka
patent: 4115730 (1978-09-01), Mansfield

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