Numerical algorithm suitable for calculating VRMS uniformity of magnetic field

A uniformity and magnetic field technology, which is applied in the field of simulation and design of MRI system components, can solve the problems that the uniformity of the imaging area cannot be described and the difference is large, and achieve the effect of high application range and high calculation accuracy

Active Publication Date: 2015-09-09
HOHAI UNIV
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Problems solved by technology

This has two disadvantages. One is that the maximum and minimum values ​​at the sampling point may be very different from the maximum and minimum values ​​in the entire area, and the other is that it cannot describe the uniformity in the entire imaging area.

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  • Numerical algorithm suitable for calculating VRMS uniformity of magnetic field
  • Numerical algorithm suitable for calculating VRMS uniformity of magnetic field
  • Numerical algorithm suitable for calculating VRMS uniformity of magnetic field

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0020] This application is supported by the Youth Fund Project of the Natural Science Foundation of Jiangsu Province (Project Approval No.: BK20130854).

[0021] In the prior art, the traditional peak-to-peak uniformity is basically used to measure the uniformity of the magnetic field generated by the MRI main magnet. The following example is used to illustrate. First, a superconducting magnet coil is designed, and then the magnetic field uniformity distribution generated by the coil in space is calculated. . The coil design requirement is that the peak-to-peak uniformity in the spherical imaging space of 45cm DSV is 6ppm, and the sampling points are 24 Gaussian distribution points on the spher...

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Abstract

The invention discloses a numerical algorithm suitable for calculating the VRMS uniformity of a magnetic field. The numerical algorithm is characterized by comprising the following steps: step (1), dispersing a region to be calculated into tetrahedral meshes; step (2) carrying out interpolation representation on the magnetic field in each tetrahedron by virtue of a primary function; step (3) determining the interpolation point in each tetrahedron and calculating the coefficient of the interpolation primary function according to the magnetic field at the interpolation point; and step (4) introducing an expansion equation of the primary function of the magnetic field into an integral formula to calculate the VRMS value of the magnetic field in an imaging region. The numerical algorithm disclosed by the invention has the benefits that the uniformity of the magnetic field in any region can be precisely calculated by virtue of the calculation method given by the invention; the numerical algorithm has a quite large range of application and a quite high calculation precision and can be used for calculating the magnetic field in the imaging region including but not limited to balls, ellipsoids, columns, cubs and the like. The precision of the algorithm can be obtained by adjusting the size of the meshes.

Description

technical field [0001] The invention relates to a numerical algorithm suitable for calculating the VRMS uniformity of a magnetic field, and belongs to the technical field of nuclear magnetic resonance imaging system component simulation and design. Background technique [0002] Magnetic resonance imaging (MRI) is a new medical imaging technology that uses the principle of nuclear magnetic resonance to perform imaging. In recent years, with the development of science and technology, the MRI system has gradually transitioned from the permanent magnet type to the superconducting type. Whether it is a permanent magnet MRI or a superconducting MRI, the core key component is a magnet. The most important index to measure the performance of a magnet is the uniformity of the magnetic field. In the past, the peak-to-peak value was usually used to measure the uniformity of the MRI main magnetic field. The so-called peak-to-peak value is the ratio of the difference between the maximu...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 平学伟殷兴辉李黎陈嘉琪刘海韵
Owner HOHAI UNIV
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