Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1982-08-09
1984-12-04
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324320, G01R 3308
Patent
active
044867115
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 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, in addition to ring-shaped individual coils for generating field gradients which are substantially constant in the imaging region, a plurality of saddle-shaped coils which are symmetrically arranged through the imaging center for generating field gradients in the x and y directions. The saddle-shaped coils have straight conductor sections extending in the z-direction and arc-shaped conductor sections which extend perpendicularly with respect to the z-axis and along the circumferential direction of the support body. In accordance with the invention, a further arc-shaped conductor section is connected in parallel with the arc-shaped conductor sections, the further arc-shaped conductor section facing a plane of symmetry. All of the arc-shaped conductor sections are displaced in the z-direction from the plane of symmetry by predetermined distances, and each arc-shaped conductor section has an electric linkage factor which is responsive to the distance between the particular arc-shaped conductor section and the plane of symmetry.
REFERENCES:
patent: 3569823 (1971-03-01), Golay
patent: 4339718 (1982-07-01), Bull
patent: 4398149 (1983-08-01), Zens
Frese Georg
Siebold Horst
Siemens Aktiengesellschaft
Tokar Michael J.
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