Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1994-03-30
1995-01-17
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324320, 335302, G01V 300, G03G 2100
Patent
active
053829050
ABSTRACT:
The invention relates to a magnet apparatus for producing a uniform magnetic field for magnetic resonance imaging (MRI). The magnet apparatus is of the type having a pair of permanent magnet discs each of which has a hole in a central region and a yoke structure in which the magnet discs are held opposite to each other. For each magnet disc the yoke structure has an aperture which is in alignment with the hole in the magnet disc. As is usual, a pair of pole plates are attached to the opposite faces of the magnet discs, respectively, so as to produce a uniform magnetic field in a space between the two magnet discs. To ease visual observation of the object of imaging in the afore-mentioned space, such as the head part of a human body, the pole plate on each magnet disc is formed with a hole which is in alignment with the hole in the magnet disc. A video camera can be used. According to the need small pole pieces are attached to the surfaces of the holed pole plates to keep uniformity of the magnetic field.
REFERENCES:
patent: 4875485 (1989-10-01), Matsutani
patent: 4943774 (1990-07-01), Breneman et al.
patent: 5061897 (1991-10-01), Danby et al.
patent: 5089798 (1992-02-01), Miyata
patent: 5134373 (1992-07-01), Tsuruno et al.
patent: 5194810 (1993-03-01), Breneman et al.
Inoue Yuji
Miyata Koji
Arana Louis
Shin-Etsu Chemical Co. , Ltd.
Yokogawa Medical Systems, Ltd.
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