Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1990-12-04
1993-02-09
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
051855755
ABSTRACT:
A high order multipole gradient field generating system in a magnetic resonant imaging apparatus comprises spaced quadrants of windings, the windings of each quadrant generating adjacent fields in each quadrant in opposing relation. The multipole system is located adjacent to a lower order conventional gradient field coil system to shield the region of interest from field aberrations, the multipole system generating a relatively strong local magnetic field adjacent to the coils of the gradient field coil system and a negligible change in field in the region of interest. The multipole system causes a frequency shift of the aberrations in the region of interest which are outside the detection frequency range such that the conventional gradient field system signal is substantially unaffected by the multipole system in the region of interest.
REFERENCES:
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patent: 4638253 (1987-01-01), Jaskolski et al.
patent: 4737718 (1988-04-01), Kemner et al.
patent: 5122747 (1992-06-01), Riederer et al.
Slobod Jack D.
Tokar Michael J.
U.S. Philips Corp.
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