Magnetic field generating apparatus for MRI

Details Magnetic field generating apparatus for MRI Magnetic field generating apparatus for MRI

1991-11-18

1993-10-12

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, 335296, G01V 300

Patent

active

052529240

ABSTRACT:
A magnetic field generating apparatus for a magnetic resonance imaging (MRI) apparatus, including soft ferrite disposed adjacently to a gradient magnetic field coil which is disposed in a gap and serves to form a static magnetic field. The soft ferrite has saturated magnetic flux density (Rs) more than 0.4 T, coersive force (He) less than 50 A/m, and specific resistance .rho. more than 10.sup.-5 .OMEGA..multidot.cm. The magnetic field generating apparatus thus constructed has a magnetic circuit arrangement that a pair of permanent magnetic bodies which are disposed so as to confront each other and define the gap are magnetically connected through a yoke, and pole pieces are fixedly secured to the surfaces of the respective permanent magnetic bodies facing the gap, thereby generating the magnetic field in the gap.

REFERENCES:
patent: 4644313 (1987-02-01), Miyajima
patent: 4707663 (1987-11-01), Minkoff et al.
patent: 4723116 (1988-02-01), Muller et al.
patent: 4818966 (1989-04-01), Miyamoto et al.
patent: 4827235 (1989-05-01), Inomata et al.
patent: 5061897 (1991-10-01), Danby et al.

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