Combined self shielded gradient coil and shimset

Details Combined self shielded gradient coil and shimset Combined self shielded gradient coil and shimset

1993-06-21

1994-09-20

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

335216, G01R 3320

Patent

active

053492978

ABSTRACT:
The magnetic field assembly of a magnetic resonance imaging device includes an annular superconducting magnet (10) which is mounted within a toroidal vacuum vessel (24). A cylindrical member (26) defines a central bore (12) through which the superconducting magnets generate a uniform, static magnetic field. A cylindrical, dielectric former (46) is mounted in the bore displaced by an annular gap (58) from the cylindrical member. A shimset (60) for shimming the uniformity of the magnetic field is mounted in the gap (58). A radio frequency coil (32) is mounted within the cylindrical member defining a patient receiving examination region. An RF shield (34) is mounted around the exterior peripheral surface of the former. Primary gradient coils (50, 52, 54) are mounted around and potted to the exterior of the dielectric former around the RF shield. Gradient shield or secondary coils (74, 76, 78) are potted around an exterior of the cylindrical member within the vacuum chamber.

REFERENCES:
patent: 4587504 (1986-05-01), Brown et al.
patent: 4703275 (1987-10-01), Holland
patent: 4733189 (1988-03-01), Punchard et al.
patent: 4737716 (1988-04-01), Roemer et al.
patent: 4761612 (1988-08-01), Holland et al.
patent: 4876510 (1989-10-01), Siebold et al.
patent: 4881035 (1989-11-01), Siebold
patent: 4978920 (1990-12-01), Mansfield et al.
patent: 5280247 (1994-01-01), DeMeester et al.
patent: 5289128 (1994-02-01), DeMeester et al.
"Active Magnetic Screening of Gradient Coils in NMR Imaging", Mansfield, et al., Journal of Magnetic Resonance, 66, 573-576 (1986) (no month).
"Active Magnetic Screening of Coils for Static and Time-Dependent Magnetic Field Generation in NMR Imaging", Mansfield, et al., J. Phys. E. Sci. Instrum. 19, 540-544 (1986) (no month).

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