Magnetic device of apparatus in nuclear spin tomography with a s

Details Magnetic device of apparatus in nuclear spin tomography with a s Magnetic device of apparatus in nuclear spin tomography with a s

1984-08-14

1986-05-20

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324320, H01F 700

Patent

active

045904529

ABSTRACT:
The magnetic device of a nuclear spin tomography system contains several magnet coils which surround an interior suitable for accommodating a body to be examined, and generate therein an at least largely homogeneous magnetic field. The device also includes an approximately cylindrical shielding device which surrounds the coils and consists of ferromagnetic material, and has at each end face thereof, a washer-shaped part with a central opening with a predetermined radius with respect to the cylindrical axis, in order to make possible good lateral access to the magnet coils and to provide sufficient space for laterally protruding parts. At least four beam-like shielding elements of identical design are used to form the approximately cylindrical part of the shielding device, the elements being uniformly distributed in the circumferential direction over the cylindrical surface. The shielding elements may have rectangular or triangular cross-sectional shapes.

REFERENCES:
patent: 4409579 (1983-10-01), Clem
patent: 4484814 (1984-11-01), Kawaguchi et al.
patent: 4490675 (1984-12-01), Knuettel et al.
patent: 4509011 (1985-04-01), Sugimoto et al.
Nature, "Image Formation by Induced Local Interactions: Examples Employing Nuclear Magnetic Resonance", P. C. Lauterbur, vol. 242, Mar. 16, 1973, pp. 190, 191.

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