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A Gradient Coil Design Method Based on Minimum Vrms Error

A technology of gradient coils and design methods, applied in calculations, special data processing applications, instruments, etc., can solve problems such as the inability to guarantee the minimum linear error, and achieve the effect of fast and accurate calculations

Active Publication Date: 2018-05-08
HOHAI UNIV
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Problems solved by technology

The disadvantage of this is that the algorithm only guarantees the minimum linear error at the sampling point, but cannot guarantee the minimum linear error in the entire imaging area

Method used

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  • A Gradient Coil Design Method Based on Minimum Vrms Error
  • A Gradient Coil Design Method Based on Minimum Vrms Error
  • A Gradient Coil Design Method Based on Minimum Vrms Error

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0048] The present invention is supported by the Youth Fund Project of Jiangsu Natural Science Foundation (project approval number: BK20130854).

[0049] like figure 1 As shown, a gradient coil design method based on minimum VRMS error includes the following steps:

[0050] Step 1: Predetermine the size of the skeleton where the gradient coil is located and the preset parameters;

[0051] Preset parameters include imaging area range, gradient field strength and VRMS error E vrms ;

[0052] VRMS error E vrms for,

[0053]

[0054] where V is the volume of the imaging area, B z is the z-direction magnetic field generated by the gradient coil, G is the slope of the gradient fi...

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Abstract

The invention discloses a gradient coil design method based on the minimum VRMS error, which is characterized in that the design of the gradient coil satisfies the minimum functional function formed by the square of the VRMS linear error and the weighted sum of coil energy storage. The invention also provides an algorithm flow for designing gradient coils based on the minimum VRMS error. For the spherical imaging area, the present invention adopts harmonic coefficient expansion to calculate VRMS error, which has high efficiency and precision. The present invention is suitable for designing any type of existing gradient coils such as cylindrical gradient coils, flat plate gradient coils, and irregular-shaped gradient coils.

Description

technical field [0001] The invention relates to a gradient coil design method based on minimum VRMS error, and belongs to the field of component design of nuclear magnetic resonance imaging systems. Background technique [0002] Whether it is a permanent magnet MRI or a superconducting MRI, the core key component is the gradient coil. The criteria for measuring the performance of gradient coils mainly include field strength, linearity, and switching rate. The design of the gradient coil is mainly to take into account these three indicators. The current mainstream gradient coil design algorithms mostly take a series of sampling points in the imaging area or surface, and then weight the sum of squares of the error between the gradient field at the sampling point and the ideal gradient field and the sum of the coil energy storage. minimum. The disadvantage of this is that the algorithm only guarantees the minimum linear error at the sampling point, but cannot guarantee the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 平学伟殷兴辉李黎李昌利刘海韵
Owner HOHAI UNIV
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