Design method for magnetic resonance imaging superconducting magnet system

A technology of magnetic resonance imaging and superconducting magnets, applied in magnetic resonance measurement, measurement of magnetic variables, measurement devices, etc., can solve problems such as difficult to achieve optimal design, low efficiency, etc., to improve design efficiency, reduce cost, and facilitate construction and the effect of installing

Active Publication Date: 2012-10-03
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0016] In order to overcome the disadvantages of the existing magnetic resonance superconducting magnet system in terms of low efficiency in electromagnetic design and difficulty in achieving optimal design, the present invention proposes a hybrid design method that combines linear programming algorithms and nonlinear optimization algorithms. The linear programming algorithm obtains the initial position of the coil, and then combines the nonlinear optimization algorithm to design the final parameters of the coil

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  • Design method for magnetic resonance imaging superconducting magnet system
  • Design method for magnetic resonance imaging superconducting magnet system
  • Design method for magnetic resonance imaging superconducting magnet system

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] The following is a design example of a short-cavity, self-shielding superconducting magnet system: The magnet system needs to generate a magnetic field distribution with a central magnetic field of 1.5T in a spherical imaging area with a diameter of 50cm, and the peak-to-peak uniformity of the magnetic field must be better than 10ppm; 5 gauss The stray field of the line is confined in an ellipsoidal area, the length of the semi-major axis is 5m, and the semi-minor axis is 4m; the inner radius of the coil is not less than 0.40m, the outer radius is not greater than 0.80m, and the length is shorter than 1.15m; the highest magnetic field in the coil If it is less than 8T, the current safety margin must be less than 80%.

[0038] First of all, the spatial range of the coils to be arranged is determined by the minimum coil inner diameter, max...

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Abstract

The invention relates to a design method for a magnetic resonance imaging superconducting magnet system. According to the design method, linear programming and non-linear optimization algorithms are combined, global optimization is performed in space where a coil is to be arranged to search the best position of the coil, and shapes and magnetic field uniformity of imaging areas, limiting ranges and intensity of stray magnetic fields, electric current security margins and the highest magnetic field intensity in the coil can be restrained. The designed coil has the advantages of being low in cost, simple in structure and the like.

Description

technical field [0001] The invention relates to a design method of a superconducting magnet system for magnetic resonance imaging. Background technique [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is a high-tech imaging based on the performance characteristics of biological magnetic nuclei (hydrogen nuclei) in a magnetic field. It has the advantages of no electromagnetic radiation, high image contrast, and tomographic imaging in any direction. It ranks first in medical imaging equipment. [0003] In 1946, Flelix Bloch of Stanford University and Edward Purcell of Harvard University independently discovered the phenomenon of nuclear magnetic resonance. The atomic nucleus with spin in a constant magnetic field is irradiated by radio frequency radiation, and the resonance absorption phenomenon occurs when the radio frequency frequency is equal to the precession frequency of the atomic nucleus in a constant magnetic field. American Raymond Damadian (Ray...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/38
CPCG01R33/3815
Inventor 倪志鹏王秋良严陆光
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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