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Gradient coil assembly

A technology of gradient coils and components, applied in the direction of measuring devices, measuring magnetic variables, instruments, etc., can solve problems such as temperature rise of shims, affecting image quality, affecting magnetic field stability and uniformity, etc., to achieve stable and uniform magnetic field and high image quality stable effect

Active Publication Date: 2020-09-22
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the gradient coil is working, the coil itself will generate heat, which will cause the temperature of the shim to rise, which will affect the stability and uniformity of the magnetic field, thereby affecting the image quality

Method used

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  • Gradient coil assembly
  • Gradient coil assembly
  • Gradient coil assembly

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] see Figure 1-5 and Figure 9-10 , the gradient coil assembly 4 in Embodiment 1 of the present invention is a component of a magnet system for magnetic resonance imaging, the gradient coil assembly 4 is installed inside the main magnet 8 , and the two are substantially coaxially arranged. The gradient coil assembly 4 in the embodiment of the present invention includes: it includes a cylindrical wall portion (main body portion) 41 and an accommodating cavity 42 formed surrounded by the wall portion 41 . Several shim holes 411 are provided in the circumferential direction of the wall portion 41 , and the shim holes 411 extend in a direction from the front end of the gradient coil to the rear end of the gradient coil. Further, two or more shim components (shimming pieces, shim strips) 1 can be assembled in one or several shim holes 411 .

[0028]...

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Abstract

The invention discloses a gradient coil assembly, and the assembly comprises a main body part with an accommodation cavity, and a uniform field hole which is disposed on the main body part and extends in an axial direction. The uniform field hole is used for accommodating a uniform field element. The assembly also comprises a cooling assembly which is arranged to be parallel to the uniform field hole. The cooling assembly comprises a bearer and a tube body arranged on the bearer. The cooling assembly is arranged to be adjacent to a uniform field bar, and can guarantee that a uniform field piece is not affected by the changes of the temperature of the gradient coil through the direct cooling of the uniform field bar, thereby guaranteeing a stable and uniform magnetic field, and enabling the image quality to be stable.

Description

【Technical field】 [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a gradient coil assembly for magnetic resonance imaging. 【Background technique】 [0002] Magnetic resonance imaging requires a magnetic field with high intensity and high uniformity, which is usually provided by an electromagnet with a superconducting or resistive coil. At present, although a lot of effort has been devoted to the design of the magnet system so that it can generate a high-intensity uniform field. However, the designed magnet system still cannot generate a completely uniform magnetic field in practical applications. The main reasons are the following: Manufacturing tolerances inevitably cause the coil to shift from its designed position, and the characteristics of the wire used may differ from those assumed during the design process; moreover, when the magnet is installed in the operating place, its The magnetic field that can be generated wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/385
CPCG01R33/3856
Inventor 高媛刘曙光杨绩文
Owner SHANGHAI UNITED IMAGING HEALTHCARE