Magnetic field generating apparatus for use in MRI

Details Magnetic field generating apparatus for use in MRI Magnetic field generating apparatus for use in MRI

1994-12-08

1996-09-17

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

335304, G01V 300

Patent

active

055572057

ABSTRACT:
In a magnetic field generating apparatus for use in MRI comprising cylindrical yokes, a pair of permanent magnets of a trapezoidal section opposed in parallel with each other in the cylindrical yokes with a predetermined gap being defined between each of the pole faces of them, permanent magnets of a triangular section in adjacent with both sides of the trapezoidal permanent magnet in which a magnetic field space having a hexagonal cross section in perpendicular to the longitudinal direction defined by pole faces of the trapezoidal permanent magnets and the pole faces of the triangular permanent magnets, wherein
the trapezoidal permanent magnets comprise rare earth system permanent magnet and the direction of magnetization thereof is identical with the direction of the magnetic field in the magnetic field space, the triangular permanent magnets comprise a ferrite system permanent magnet and the direction of magnetization thereof is at a 90.degree. direction relative to the counterface to the magnetic field space, and an extreme end at a yoke abutting face of the trapezoidal permanent magnet corresponds with an extreme end at yoke abutting face of the triangular permanent magnet.

REFERENCES:
patent: 4695802 (1987-09-01), Zijlstra

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