Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1994-06-29
1997-07-22
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324319, 335296, G01V 300
Patent
active
RE0355658
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.
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patent: 4723116 (1988-02-01), Muller et al.
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patent: 4827235 (1989-05-01), Inomata et al.
patent: 5061897 (1991-10-01), Danby et al.
Sakurai Hideya
Sato Shigeru
Takeshima Hikotaka
Uzuki Junji
Arana Louis M.
Hitachi Medical Corp.
Sumitomo Special Metals Co. Ltd.
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