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EP0965304A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Mri magnetic field generator

Assignee: Proterial Ltd
•
Filing: 1997-12-26
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Granted: —
•
Expires: 2017-12-26
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Abstract

Abstract An object of the present invention is to provide an MRI magnetic field generator with a structure that makes it possible to obtain a uniform static magnetic field stably within the imaging space, without making the patient feel confined, despite the structure being compact and low-cost, and that yields a sharp image with high resolution. Magnetic field boosting coils 14 are wound around the peripheral edges of a pair of magnetic pole pieces that face each other so as to form an air gap, which makes it possible to increase or decrease the magnetic field intensity with a simple construction, without having to modify the shape of the magnetic circuit or increase the weight or surface area of the magnets. Also, the magnetic field distribution can be adjusted by adjusting the direction of the current flowing to the coils, which enhances magnetic field uniformity.

Inventors

  • 👤 Hideya Sakurai
  • 👤 Masaaki Aoki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 23:17
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/381; G01R33/3806

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 62 words
An MRI magnetic field generator having a pair of magnetic poles that face each other so as to form an air gap and that are magnetically coupled by a yoke, and generating a magnetic field in said air gap, said MRI magnetic field generator comprising magnetic field adjusting coils wound around the peripheral edges of magnetic pole pieces disposed on said poles.
Claim 2
Dependent Claim 33 words
The MRI magnetic field generator according to claim 1, wherein the magnetic pole pieces include annular protrusions, and the magnetic field adjusting coils are wound around the peripheral edges of said annular protrusions.
Claim 3
Dependent Claim 38 words
The MRI magnetic field generator according to claim 1, wherein the magnetic pole pieces include annular protrusions and magnetic material bases, and the magnetic field adjusting coils are wound around the peripheral edges of said magnetic material bases.
Claim 4
Dependent Claim 47 words
The MRI magnetic field generator according to claim 1, wherein the magnetic pole pieces include annular protrusions and magnetic material bases, and the magnetic field adjusting coils are wound around the peripheral edges of said annular protrusions and around the peripheral edges of said magnetic material bases.
Claim 5
Dependent Claim 51 words
The MRI magnetic field generator according to claim 1, wherein the magnetic pole pieces include annular protrusions, magnetic material bases, and internal magnetic pole pieces, and the magnetic field adjusting coils are wound around the peripheral edges of said annular protrusions and around the peripheral edges of said magnetic material bases.
Claim 6
Dependent Claim 21 words
The MRI magnetic field generator according to claim 5, wherein the internal magnetic pole pieces are composed of silicon steel plates.
Claim 7
Dependent Claim 38 words
The MRI magnetic field generator according to claim 2, wherein the annular protrusions are composed of a plurality of arc-shaped annular protrusion members, and the magnetic field adjusting coils are wound around each of said annular protrusion members.
Claim 8
Dependent Claim 21 words
The MRI magnetic field generator according to claim 7, wherein the annular protrusions are composed of four arc-shaped annular protrusion members.
Claim 9
Dependent Claim 26 words
The MRI magnetic field generator according to any of claims 2 to 8, wherein at least part of the annular protrusions is formed from silicon steel.
Claim 10
Dependent Claim 44 words
The MRI magnetic field generator according to any of claims 1 to 9, wherein the pair of magnetic pole pieces are fastened to an upper yoke and a lower yoke, and the upper and lower yokes are magnetically coupled by a single connecting yoke.
Claim 11
Dependent Claim 42 words
The MRI magnetic field generator according to any of claims 1 to 9, wherein the pair of magnetic pole pieces are fastened to upper and lower yokes, and the upper and lower yokes are magnetically coupled by a plurality of connecting yokes.
Claim 12
Dependent Claim 36 words
The MRI magnetic field generator according to any of claims 1 to 9, wherein the pair of magnetic pole pieces are disposed facing each other within a tubular yoke and are magnetically coupled by said yoke.

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