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Calculation method of magnetic field and inductance value in cylindrical surface axial gradient coil design

A technology of gradient coils and calculation methods, which is applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of long time nonlinear optimization and long calculation time, etc.

Active Publication Date: 2016-06-29
HOHAI UNIV
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Problems solved by technology

Since the calculation of these two quantities involves some complex functions, the calculation time is long, resulting in a long time for nonlinear optimization

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  • Calculation method of magnetic field and inductance value in cylindrical surface axial gradient coil design
  • Calculation method of magnetic field and inductance value in cylindrical surface axial gradient coil design
  • Calculation method of magnetic field and inductance value in cylindrical surface axial gradient coil design

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] In a superconducting MRI system, axial gradient coils are generally distributed on a cylindrical surface. In actual cylindrical gradient coils, a layer of shielding coils is generally added outside the main coil, and the shielding coils are also composed of rings distributed on the surface of a layer of cylinder. figure 2 It is a typical active shielding gradient coil structure, the inner surface is the main coil, the outer surface is the shielding coil, and all the coils are oddly symmetrical about the axial center. The main coil and the shielding coil are composed of several Maxwell coils. The so-called Maxwell coil is a coil pair composed of two rings with the same radius and opposite current flow, such as image 3 shown. Therefore, for axial coils, when the number of Maxwell coils is determined, the main purpose is to optimize the position of each ring. ...

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Abstract

The invention discloses a quick calculation method of a magnetic field and an inductance value in cylindrical surface axial gradient coil design. The quick calculation method comprises the following steps: before an optimization algorithm is begun, dividing the axial coordinate of the coil into N1 equal parts in the distribution intervals of a positive half axis, and calculating a magnetic field generated by a Maxwell coil on each coordinate point on each magnetic field sampling point; calculating the self-inductance of a single circular ring, and storing by one variable; dividing the whole axial distribution interval of the coil into N2 equal parts, and calculating the self-inductance of two circular rings in each sampling interval; and storing all calculation results by the variables, and expressing the magnetic field and the inductance value of each sampling point independently by an interpolation function according to a result on each discrete point during iteration. Compared with the traditional method, a calculated quantity can be saved to a high limit, calculation speed is quickened, calculation time is shortened, and an efficient nonlinear optimal gradient coil algorithm becomes possible.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance, in particular to a fast calculation method for magnetic field and inductance value in axial gradient coil design. Background technique [0002] The gradient coil is one of the key components of the nuclear magnetic resonance system juxtaposed with the superconducting magnet and the radio frequency coil. An NMR system includes three gradient coils, which respectively provide magnetic fields that vary linearly with spatial coordinates in three orthogonal directions. The two gradient coils that provide the transverse gradient magnetic field are called transverse coils, and the gradient coils that provide the longitudinal gradient field are called longitudinal coils. For cylindrical gradient coils, longitudinal coils are also called axial coils. [0003] Currently, there are many methods for designing gradient coils. One method is to use nonlinear algorithm design such as simula...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 李黎平学伟王红杰
Owner HOHAI UNIV
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