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An apparatus for decreasing magnetic vortex in MRI

A magnetic resonance imaging and magnet technology, applied in magnetic resonance measurement, magnetic variable measurement, medical science, etc., can solve problems such as large eddy currents

Inactive Publication Date: 2009-12-16
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

[0012] The purpose of the present invention is to solve the problem that the polar plate of the magnetic resonance imaging magnet in the prior art generates a large eddy current when the axial gradient coil is working, and further improve the imaging level of the magnetic resonance imaging system

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  • An apparatus for decreasing magnetic vortex in MRI
  • An apparatus for decreasing magnetic vortex in MRI
  • An apparatus for decreasing magnetic vortex in MRI

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Figure 5Shown is the basic structural principle of the present invention. Arranged in the direction from the magnetic pole head to the imaging space, the order is the plate head 401 , the insulating layer 402 , the channeling layer 403 , the shielding gradient coil 404 , and the main gradient coil 407 . The main gradient coil 407 is located on the outside of the side of the channeling layer 403 facing the imaging space. At the same time, there is a shim ring 406 on the side close to the imaging space. The pole plate head 401 is made of both magnetic and conductive materials. In order to prevent the magnetic lines of force from entering the pole plate head 401, a non-magnetic and non-conductive insulating layer 402 is attached under the pole plate head 401, and then a magnetically conductive and non-conductive guide layer 403 of suffi...

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Abstract

A device for reducing eddy currents in magnetic resonance imaging magnets, which mainly includes the following components: a pole plate head [401] for generating a uniform magnetic field, an insulating layer for isolating eddy currents [402], and a guide for guiding gradient magnetic fields layer [403], a main gradient coil [407] generating the main gradient magnetic field, a shielding coil [404] and a shim ring [406]. The shielding gradient coil [404] is located between the plate head [401] and the dredging layer [403], embedded in the insulating layer [402], and the shielding gradient coil [404] is electrically connected to the main gradient coil [407]. The polar plate head [401] is made of magnetically conductive and conductive materials, and its side facing the imaging space is attached with a non-magnetic and non-conductive insulating layer [402], and the side of the insulating layer [402] facing the imaging space is attached There is a layer of high magnetic permeability and non-conductive grooming layer [403]. The shielding gradient coil [404] can guide most of the magnetic flux of the longitudinal gradient magnetic field into the guide layer [403], which can greatly reduce the eddy current generated by the longitudinal gradient magnetic field on the pole plate, thereby greatly improving the image quality.

Description

technical field [0001] The present invention relates to magnetic resonance imaging (MRI) systems, and more particularly to an apparatus for reducing eddy currents in magnetic resonance imaging magnets. Background technique [0002] When the magnetic resonance imaging system works, the human body is placed in a strong static magnetic field, and the atomic nuclei in some areas of the human body are excited by sending radio frequency pulses to the human body. After the radio frequency field is removed, these excited nuclei radiate radio frequency signals, which are received by the antenna. When a gradient magnetic field is added in this process, the spatial distribution information of the human body can be obtained through radio frequency signals, thereby reconstructing a two-dimensional or three-dimensional image of the human body. [0003] The gradient magnetic field is generated by the gradient coil, which is installed close to the polar plate, and pulse currents with diffe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055G01R33/44
Inventor 杨文晖宋涛胡丽丽王铮
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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