Flat surface active shielded gradient coil preparation method

A technology of shielding coils and gradient coils, which is applied in the direction of measuring devices, measuring magnetic variables, instruments, etc., can solve the problem of less available space

Active Publication Date: 2008-06-04
BEIJING WANDONG MEDICAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Shielded gradient coils are currently only used in high-field barrel-type magnetic resonance imaging (MRI) systems, and have not been used in open-type devices due to the limited space available

Method used

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  • Flat surface active shielded gradient coil preparation method
  • Flat surface active shielded gradient coil preparation method
  • Flat surface active shielded gradient coil preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] 1. Calculate the current distribution function of the active coil according to the known field distribution and the method of the target field.

[0083] 2. Add two shielding coils to the active coil, when the

[0084] F x ( s 1 ) ( k x , k z ) = - csch ( 2 k y d ) (8)

[0085] × { F x ( 1 ) ( k x , k z ) sinh [ ...

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Abstract

The invention discloses a method for making flat active shielding gradient coil, relating to the technique of flat active shielding gradient coil used in the MRI system. The method comprises the following steps of: making initial proposal according to the design index; using gradient magnetic field inversion calculation software to perform analog calculation to obtain the original design proposal; using large commercial magnetic field simulation calculation software to perform forward verification calculation to the original design proposal; amending repeatedly the design proposal by means of inversion calculation and forward calculation to obtain the primary proposal of the gradient coil; carrying out trail production of the gradient coil according to the primary proposal; testing the related technical data and enhancing the design proposal according to the result of the test to obtain high-performance flat active shielding gradient coil. The gradient coil made by the method of the invention can generate strong gradient magnetic field with uniform linearity and fast switching and can effectively avoid eddy current.

Description

technical field [0001] The present invention relates to planar active shielded gradient coils for use in Magnetic Resonance Imaging (MRI) systems. Background technique [0002] Magnetic resonance imaging (MRI) is a widely used imaging diagnostic method. A magnetic resonance imaging (MRI) system includes a magnet subsystem, a gradient subsystem, and a radio frequency subsystem. Among them, the magnet system generates a strong and uniform static magnetic field. In order to spatially encode the image, a gradient magnetic field needs to be added to the static magnetic field. The gradient magnetic field consists of a series of gradient coils. The gradient coils usually have gradient coils in three directions: X, Y, and Z. . [0003] The performance of gradient coils includes: maximum gradient strength, switching rate and coil homogeneity area, etc. In order to meet the needs of imaging, a rapidly changing magnetic field is required. The magnetic field that changes with time wi...

Claims

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Application Information

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IPC IPC(8): G01R33/385G01R33/421
Inventor 王为民李培周德开黄开文
Owner BEIJING WANDONG MEDICAL TECH CO LTD
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