Method and Device for Holding and Adjusting Permanent Magnets Included in an NMR System
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsSandrine Cazaux, Alexandre Branco
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Abstract
The device for holding and adjusting individual permanent magnets included in a spectroscopy or a magnetic resonant imaging system comprises, for each individual permanent magnet: a first rigid fork of non-magnetic material that laterally clamps in fixed manner the individual permanent magnet; and a second rigid fork of non-magnetic material that engages the first fork via a slideway system and that is provided with means for radially adjusting the first fork relative to a stationary support to which the second fork is attached. The device enables fine adjustment to be made after assembling a magnetized structure that is constituted by rings of individual magnets.
Claims14
A device for creating a main magnetic field of a spectroscopy or a magnetic resonant imaging system with individual permanent magnets being held and adjusted for the purpose of creating said magnetic field, said device being included in the spectroscopy or magnetic resonant imaging system, said system presenting a longitudinal axis relative to which a system of cylindrical coordinates can be defined with a longitudinal direction, a radial direction, and a tangential direction, each individual permanent magnet presenting main faces perpendicular to said longitudinal axis and lateral faces perpendicular to said main faces, wherein the device includes, for each individual permanent magnet, a first rigid fork of non-magnetic material that clamps the individual permanent magnet laterally in fixed manner, and a second rigid fork of non-magnetic material that engages said first fork by means of a slideway system oriented along said radial direction and that is provided with radial adjustment means for radially adjusting the first fork relative to a stationary support to which the second fork is attached, and wherein the second rigid fork is also provided with adjustment means for adjustment relative to the stationary support in a direction perpendicular to the main faces of said individual permanent magnet.
A method of creating a main magnetic field of a spectroscopy or a magnetic resonant imaging system with individual permanent magnets for creating said main magnetic field being held and adjusted, said spectroscopy or magnetic resonant imaging system presenting a longitudinal axis relative to which a system of cylindrical coordinates can be defined with a longitudinal direction, a radial direction, and a tangential direction, each individual permanent magnet presenting main faces perpendicular to said longitudinal axis and lateral faces perpendicular to said main faces, wherein for each individual permanent magnet it comprises the following steps:
- placing a first rigid fork of non-magnetic material in fixed manner on each individual permanent magnet, the fork laterally clamping the individual permanent magnet in fixed manner;
- for each individual permanent magnet, arranging a second rigid fork of non-magnetic material that engages said first fork via a slideway system oriented along said radial direction;
- and
- radially adjusting the position of the first fork relative to a stationary support to which said second fork is attached;
- and
- wherein it further comprises the step consisting in adjusting the position of the second fork relative to said stationary support in a direction perpendicular to the main faces of said individual permanent magnet.
Dependencies are inferred from the claim text.