Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1982-08-09
1984-08-28
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3308
Patent
active
044686226
ABSTRACT:
A gradient coil system for an image-generating, nuclear magnetic resonance tomographic apparatus, particularly a zeugmatographic apparatus. The gradient coil system is arranged on a support body of rotational symmetry, illustratively a hollow cylindrical support body, having an axis which extends along the z-direction of an x, y, z coordinate system which has an origin in the center of an imaging region. The gradient coil system contains two pairs of toroidal individual coils which are arranged symmetrically with respect to an x-y plane which extends through the center of the imaging region and which are arranged perpendicular to the z-axis. The direction of current flow in the individual coils of a coil pair is opposite to the direction of flow in the individual coils of the other coil pair. Moreover, further sets of coils are provided for generating field gradient G.sub.x in the x-direction, and G.sub.y in the y-direction. The hollow cylindrical shape of the support body on which the individual coils are arranged permit an imaging region having a substantially spherical volume with a substantially constant field gradient G.sub.z to be achieved. Each of the coils has a predetermined linkage factor which corresponds to the product of the current flowing through the number of coil turns of the coil. Those coils which are arranged further from the plane of symmetry have a substantially larger linkage factor than the coils which are nearer to the plane of symmetry.
REFERENCES:
patent: 3566255 (1971-02-01), Jaynes
patent: 3569823 (1971-03-01), Golay
patent: 3577067 (1971-05-01), Weaver
Frese Georg
Siebold Horst
Siemens Aktiengesellschaft
Tokar Michael J.
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