Computer aided design method for magnetic resonance imaging transverse gradient coil

Abstract

A computer aided design method for magnetic resonance imaging transverse gradient coil, which belongs to the application of superconducting technology. The method is characterized in that parametric description for space trace of the transverse gradient coil is realized through introducing the basic shape of an ellipse-like double-saddle shaped coil, then space tracking parameter of the coil serves as optimization variable, and the mean square deviation of the gradient strength value and the gradient set value of each target point on an imaging space surface serves as an objective function for realizing the optimum design of the gradient linearity of the transverse gradient coil. The method is used for designing the transverse gradient coil, and has the advantages that the counting is simple and direct, the linearity of the design result is high, and the processing and the manufacturing are convenient.

Description

technical field [0001] The invention belongs to the technical field of applied superconductivity, and in particular relates to the gradient coil design of an animal superconducting magnetic resonance imaging system. Background technique [0002] Magnetic resonance imaging is a technique for imaging based on the phenomenon of nuclear magnetic resonance. The gradient coil is an important part of the magnetic resonance imaging system. Its function is to generate a magnetic field that is superimposed on the direction of the main magnetic field and whose magnetic induction intensity changes linearly along the coordinate direction. Its performance indicators mainly include: [0003] (1) Gradient intensity refers to the rate of change of magnetic induction intensity per unit length in the imaging area. [0004] (2) Gradient linearity, which describes the uniformity of the gradient intensity in the imaging space. One definition method is [0005] d = ...

AI Technical Summary

Problems solved by technology

[0007](3) Coil inductance affects the establishment time of the gradient magnetic field, thereby affecting the imaging speed of the magnetic resonance imaging system

The advantage of the forward design method is that it is simple and direct, and it is convenient for engineering calculation and realization; but its disadvantage is that the performance indicators such as the linearity of the coil are closely related to the predetermined coil shape, and it is difficult to achieve the global optimum of the coil performance.

The advantage of the reverse design method is that it can accurately solve the current density distribution of the field according to the shape of the field; its disadvantage is that the calculation is more complicated, and there are errors in the "apodization" in the calculation process and the final discretization of the current density. , resulting in degraded coil performance

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