Magnetic apparatus of a nuclear spin tomography system with an a

Details Magnetic apparatus of a nuclear spin tomography system with an a Magnetic apparatus of a nuclear spin tomography system with an a

1985-11-06

1987-06-16

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

335301, G01R 3320, H01F 700

Patent

active

046738819

ABSTRACT:
The magnetic apparatus of a nuclear spin tomography system contains several magnet coils which are surrounded by an approximately hollow-cylindrical shielding device of ferromagnetic material. At each end face, this shielding device has a disc-shaped plate with a central opening. Four beam-like shielding elements of identical design having triangular or trapezoidal cross section, arranged distributed in the circumferential direction regularly on a common cylinder surface, extend between these plates at the end faces. With this magnetic apparatus, field distortions caused in the useful volume by the four beam-like shielding elements are substantially reduced. Each shielding element is extended in the outer regions of its base area facing the magnet coils to form a leg part extending toward the adjacent element which is spaced therefrom, which, together with the adjoining side surface of the shielding element, forms a common extended outside surface and has a predetermined thickness in the direction of the normal relative to this outside surface.

REFERENCES:
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patent: 4315216 (1982-02-01), Clow et al.
patent: 4490675 (1984-12-01), Knuettel et al.
patent: 4498048 (1985-02-01), Lee et al.
patent: 4585994 (1986-04-01), Ewing
patent: 4590428 (1986-05-01), Muller et al.
patent: 4590452 (1986-05-01), Ries et al.
patent: 4613820 (1986-09-01), Edelstein et al.
Cryogenics, Feb. 1980, vol. 20, No. 2, pp. 59-74.

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