Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1996-08-08
1998-04-28
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324319, G01V 300
Patent
active
057449600
ABSTRACT:
A magnet resonance imaging system is described having an open magnet structure that provides a remote region of background field homogeneity for imaging. The system includes spatial encoding gradient coils and an rf coil. The open magnet structure has a primary magnet with two primary pole pieces connected by a primary ferromagnetic core for internal flux. Each primary pole piece has a surface facing away from the primary magnet. Located between the two primary pole pieces is a bias magnet having two bias pole pieces connected by a bias ferromagnetic flux pathway for internal flux. The bias magnet has polarity opposite to the primary magnet. Each bias pole piece has a surface facing away from the bias magnet and in a direction the same as the surfaces of the primary pole pieces. Superposition of the magnetic fields of the primary magnet and bias magnet provide a region of substantial background field homogeneity remote from the magnets in said direction. Also described are (i) planar spatial encoding gradient coils that provide a remote gradient field in the region of substantial background field homogeneity and (ii) a planar rf coil that provides a remote rf field in the region of substantial background field homogeneity.
REFERENCES:
patent: 4379262 (1983-04-01), Young
patent: 4590427 (1986-05-01), Fukushima et al.
patent: 5117188 (1992-05-01), Ohkawa
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patent: 5428292 (1995-06-01), Dorri et al.
Arana Louis M.
Brigham and Women's Hospital
Neuner George W.
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