Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1982-01-18
1984-06-26
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324309, G01R 3308
Patent
active
044568819
ABSTRACT:
Apparatus for imposing a gradient magnetic field intensity on a static magnetic field intensity in a nuclear-magnetic-resonance (NMR) system. The gradient field has a predetermined error relationship with respect to a desired characteristic of the gradient field within a selected region. The selected region is substantially smaller in volume than the volume "enclosed" by a surface or surfaces on which electrical conductors are distributed to generate the gradient field. The surface current densities in a grid-like pattern of differential areas on the surfaces are chosen such that, within the selected region, the predetermined error relationship results. The gradient field intensity outside of the selected region generally does not have the characteristic desired within the region. The predetermined error relationship can be established in a linearly-varying field intensity in a spherical volume enclosed by a cylindrical surface. Generally hyperbolically-shaped electrical coils on the cylindrical surface can provide surface current densities required for a constant transverse-gradient (a linearly varying magnetic field intensity in a direction transverse to the axis of the cylinder).
REFERENCES:
patent: 4284948 (1981-08-01), Young
patent: 4354499 (1982-10-01), Damadian
Technicare Corporation
Tokar Michael J.
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