Asymmetric self-shielding open type magnetic resonance imaging superconducting magnet

A technology of magnetic resonance imaging and superconducting magnets, applied in superconducting magnets/coils, magnetic objects, measuring magnetic variables, etc., and can solve problems such as insufficient openness

Active Publication Date: 2013-06-12
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the lack of openness of the existing magnetic reson

Method used

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  • Asymmetric self-shielding open type magnetic resonance imaging superconducting magnet
  • Asymmetric self-shielding open type magnetic resonance imaging superconducting magnet
  • Asymmetric self-shielding open type magnetic resonance imaging superconducting magnet

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[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] figure 1 It is a two-dimensional layout diagram of the coil space of the asymmetric self-shielding open magnetic resonance imaging superconducting magnet of the embodiment of the present invention. like figure 1 As shown, the present invention includes a superconducting main coil, a superconducting shielding coil, a superconducting axial shim coil 4 and a superconducting radial shim coil 5 . The superconducting main coil, superconducting shielding coil, superconducting axial shim coil 4 and superconducting radial shim coil 5 are all installed in the pre-arranged coil area 1 with a rectangular cross section. The superconducting main coil consists of eight axisymmetric solenoid coils with the axis of symmetry 7 as the central axis. The eight solenoid coils are respectively installed at the radial positions closest to the central axis 7 ...

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Abstract

The invention discloses an asymmetric self-shielding open type magnetic resonance imaging superconducting magnet, comprising a superconducting main coil, a superconducting shielding coil, a superconducting axial shim coil (4) and a superconducting radial shim coil (5). All the coils are asymmetrically arranged in a pre-arranged coil area. The superconducting axial shim coil (4) and the superconducting radial shim coil (5) are respectively arranged on two cylindrical frameworks, and midplanes of the two cylindrical frameworks are coincident with a central point (9) of a spherical imaging area (6); and the superconducting main coil and the superconducting shielding coil deviate from the center of the superconducting magnet by 10cm in an axial direction, a high-uniformity magnetic field with the magnetic field peak-to-peak value nonuniformity being 10ppm is generated in the spherical imaging area (6) with the diameter being 50cm in distribution, and the superconducting axial shim coil (4) and the superconducting radial shim coil (5) respectively generate a correcting magnetic field so as to improve the magnetic field peak-to-peak value nonuniformity of the spherical imaging area to be superior to 1ppm.

Description

technical field [0001] The invention relates to an open type magnetic resonance superconducting magnet. Background technique [0002] Whole-body magnetic resonance imaging superconducting magnet systems generally require a spherical imaging area (Diameter of Spherical Volume, DSV) with a diameter of 40-50 cm to generate a high-uniformity space with a peak-to-peak non-uniformity of the magnetic field better than 20 ppm (parts per million, ppm). magnetic field distribution. The magnetic resonance superconducting magnet system is usually a horizontal hollow solenoid structure, and its central hollow area provides a room temperature hole with a diameter of 80cm and an axial length of about 1.5m~2.0m. However, a large number of clinical trials have shown that patients generally exhibit symptoms of claustrophobia in narrow and cramped spaces. out of the open MRI system. [0003] The structure of the open MRI system mainly has three forms, namely the biplane type, the short-cavi...

Claims

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Application Information

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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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