Magnetic resonance imaging magnet having minimally symmetric fer

Details Magnetic resonance imaging magnet having minimally symmetric fer Magnetic resonance imaging magnet having minimally symmetric fer

1989-04-06

1990-06-05

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324320, H01F 700

Patent

active

049317598

ABSTRACT:
A magnetic resonance imaging magnet has a solenoidal superconducting winding producing a magnetic field and defining an examination region within a bore thereof. The examination region receives a body to be examined. The solenoidal superconducting winding generates a quasi-static magnetic field for aligning atomic nuclei in the body being examined. A two-fold or minimally symmetric ferromagnetic shield has a pair of magnetic flux return paths positioned on opposite sides of the solenoidal superconducting winding for reducing the magnetic field intensity in a region proximate to and outside of the solenoidal superconducting winding. A magnetic field inhomogeneity compensating system reduces magnetic field inhomogeneities introduced into the magnetic field within the examination region by the minimally symmetric ferromagnetic shield to provide a highly uniform quasi-static magnetic field within the examination region.

REFERENCES:
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patent: 4743880 (1988-05-01), Breneman et al.
patent: 4768008 (1988-08-01), Purcell et al.
patent: 4782671 (1988-11-01), Breneman et al.

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