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Gradient eddy current correction method and gradient eddy current correction device for magnetic resonance imaging system

A technology of magnetic resonance imaging and correction method, which is applied in the direction of measuring device, magnetic measurement environment, and measurement of magnetic variables, etc. It can solve the problems of cumbersome objective function, inaccurate initial guess, and difficulty in determining the number of eddy current components, etc., and achieve the goal of solving Function cumbersome effects

Active Publication Date: 2017-03-08
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

It can effectively solve the problems of cumbersome objective function, inaccurate initial guess and difficulty in determining the number of eddy current components in traditional calculation methods.

Method used

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  • Gradient eddy current correction method and gradient eddy current correction device for magnetic resonance imaging system
  • Gradient eddy current correction method and gradient eddy current correction device for magnetic resonance imaging system
  • Gradient eddy current correction method and gradient eddy current correction device for magnetic resonance imaging system

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Embodiment Construction

[0022] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0024] figure 1 It is a flow chart of the gradient eddy current correction method provided by the present invention. Please refer to figure 1 , the gradient eddy current correction method of the present invention comprises the following steps:

[0025] Step S1 is executed to establish a vortex field model, and the vortex field model uses Laplace transform to represent the vortex field.

[0026] In order to improve computing efficiency ...

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Abstract

The invention provides a gradient eddy current correction method and a gradient eddy current correction device for a magnetic resonance imaging system. The method comprises the following steps: building an eddy current field model, wherein the eddy current field model uses Laplace transform to represent an eddy current field; collecting eddy current measurement data, and using the eddy current field model to process the eddy current measurement data to acquire the initial parameter values of the eddy current field model; fitting the parameter values of the eddy current field model according to the eddy current measurement data and the initial parameter values to get a calibrated eddy current field model; and correcting gradient eddy current according to the calibrated eddy current field model.

Description

technical field [0001] The present invention mainly relates to the technical field of magnetic resonance imaging, in particular to a gradient eddy current correction method and device for a magnetic resonance imaging system. Background technique [0002] In the process of magnetic resonance imaging (MRI), the current in the gradient coil switches rapidly with time, which will generate eddy currents in the surrounding conductor structure, and the eddy currents will generate a magnetic field that is constantly changing in space and time, making the imaging area The gradient magnetic field in the magnetic field is distorted, which ultimately affects the quality of MRI images. [0003] In order to eliminate the influence of eddy currents on the gradient magnetic field, one method is to use an additional coil that generates a reverse gradient magnetic field as a self-shielding coil to suppress the generation of eddy currents by reducing the interaction between the coil and the ma...

Claims

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Application Information

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IPC IPC(8): G01R33/385
CPCG01R33/0017G01R33/0064G01R33/0082G01R33/56518G01R33/5608
Inventor 李博贾二维邢晓聪徐恺频
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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