Closed superconductive magnet with uniform imaging volume

Details Closed superconductive magnet with uniform imaging volume Closed superconductive magnet with uniform imaging volume

1996-02-20

1997-01-14

Gellner, Michael L.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

324319, H01F 600, G01V 300

Patent

active

055944019

ABSTRACT:
A closed magnetic resonance imaging (MRI) magnet has a single superconductive coil assembly including a toroidal-shaped coil housing containing a pair of superconductive main coils and at least one additional superconductive main coil. A pair of generally-non-permanently-magnetized ferromagnetic rings is spaced radially inward and apart from the superconductive main coils. The ferromagnetic rings allow the design of a shorter MRI magnet because the ferromagnetic rings overcome the gross magnetic field distortions in the imaging volume of the magnet (created by removing some of the additional longitudinally-outermost superconductive main coils, otherwise used in the magnet, to make the magnet shorter) to produce a magnetic field of high uniformity within the imaging volume.

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Pending U.S. patent application Ser. No. 08/373,996, filed Oct. 17, 1995, buy Bizhan Dorri, entitled "Method for Passively Shimming a Magnet".
Concurrently filed U.S. patent application RD-24846, by Bizhan Dorri et al, entitled "Closed Superconductive Magnet with Homogeneous Imaging Volume", Ser. No. 08/603520.
Concurrently filed U.S. patent application RD-24845, by Bizhan Dorri et al, entitled "Closed MRI Magnet Having Reduced Length", Ser. No. 08/603522.
Pending U.S. patent application Ser. No. 08/457,085, filed Oct. 23, 1995, by Bizhan Dorri et al., entitled "Cryogenic-Fluid-Cooled Open MRI Magnet with Uniform Magnetic Field".
Pending U.S. patent application Ser. No. 08/547,002, filed Oct. 23, 1995, by Bizhan Dorri et al., entitled "Open MRI Magnet with Homogeneous Imaging Volume".
Pending U.S. patent application Ser. No. 08/553,734, filed Oct. 23, 1995, by E. T. Laskaris et al., entitled "Open MRI Magnet with Uniform Imaging Volume".
Pending U.S. patent application Ser. No. 08/509,565, filed Jul. 31, 1995, by T. Havens et al., entitled "Open Architecture Magnetic Resonance Imaging Superconducting Magnet Assembly".
Pending U.S. patent application Ser. No. 08/547,083, filed Oct. 23, 1995, by Bizhan Dorri et al., entitled "Shielded and Open MRI Magnet".
Pending U.S. patent application Ser. No. 08/373,995, filed Oct. 17, 1995, by Bizhan Dorri, entitled "Method for Passively Shimming an Open Magnet".

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