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An MRI superconducting magnet for animal imaging

A magnetic resonance imaging and superconducting magnet technology, which is applied in superconducting magnets/coils, magnetic objects, measuring magnetic variables, etc., can solve the problems of large stray field range and low magnetic field intensity

Active Publication Date: 2015-08-12
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing magnetic resonance imaging superconducting magnet system, such as low central magnetic field intensity and large stray field range, and propose a new magnetic resonance imaging superconducting magnet

Method used

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  • An MRI superconducting magnet for animal imaging
  • An MRI superconducting magnet for animal imaging
  • An MRI superconducting magnet for animal imaging

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0011] figure 1 It is a schematic structural diagram of a superconducting magnet according to an embodiment of the present invention. Such as figure 1 As shown, the superconducting magnet is composed of a superconducting main coil 2 , a superconducting axial shielding coil 3 and a superconducting radial shielding coil 4 . The superconducting main coil 2, the superconducting axial shielding coil 3 and the superconducting radial shielding coil 4 work together to generate a highly uniform magnetic field distribution with a central magnetic induction intensity of 4.7T, and the direction of the magnetic induction intensity faces the positive direction of the symmetry axis 8 . The superconducting main coil 2, the superconducting axial shielding coil 3 and the superconducting radial shielding coil 4 are all installed in the pre-arranged coil space ...

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Abstract

The invention relates to a magnetic resonance imaging superconducting magnet for animal imaging. The superconducting magnet is composed of superconducting main coils (2), superconducting axial shielding coils (3) and a superconducting radial shielding coil (4), wherein all the coils are axisymmetric solenoid coils using a symmetric axis (8) as a center axis. The superconducting main coils (2) are three pairs of solenoid coils with forward current, and the superconducting axial shielding coils (3) are a pair of solenoid coils with reverse current. The superconducting main coils (2) and the superconducting axial shielding coils (3) are positively symmetrically arranged about a symmetry plane (9). The superconducting radial shielding coil (4) is a solenoid coil with the reverse current, and the middle plane of the superconducting radial shielding coil is overlapped with the symmetry plane (9). The superconducting magnet generates highly-uniform magnetic field distribution at three concentric spherical areas (5, 6 and 7) with the diameters respectively being 80mm, 150mm and 200mm, and five Gaussian stray fields are respectively limited within the range of 1.5m and 2.2m ellipsoids in a radial direction and an axial direction.

Description

technical field [0001] The invention relates to a magnetic resonance imaging superconducting magnet. Background technique [0002] A magnetic resonance imaging (MRI) superconducting magnet system generally consists of superconducting magnets, room temperature shim coils, gradient coils, radio frequency coils, cryogenic containers, refrigerators, magnetic field measurement systems, and computers. Among them, the superconducting magnet is the most expensive core component in the MRI system. Its function is mainly to generate a highly uniform magnetic field distribution in a central area, which is generally spherical in shape. MRI generally needs to constrain the stray field range of 5 gauss. The confinement methods include passive shielding and active shielding technology. Passive shielding technology refers to the arrangement of magnetic iron sheets in the wall of the room where the MRI system is placed to form a magnetic flux loop, so that The spatial range of the 5 Gauss s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F6/00H01F6/06G01R33/3815
Inventor 倪志鹏王秋良严陆光
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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