High-field whole-body magnetic resonance imaging active shielding superconducting magnet and design method

Abstract

The invention relates to a high-field whole-body magnetic resonance imaging active shielding superconducting magnet and a design method. The magnet comprises a main coil, an adjusting coil and a shielding coil, the main coil is a long solenoid coil, and the coil structure is preset, that is, the number of turns of a wire, the specification of the wire, the size of the coil and the position of the coil are known; and corresponding wire turns, wire specifications, coil sizes, coil positions and whole magnet operation current of the adjusting coil and the shielding coil are information to be solved, magnetic fields of the main coil, the adjusting coil and the shielding coil are superposed, the uniformity of the magnetic field generated in the center area of the magnet reaches a specified constraint condition, and meanwhile, the 5 Gaussian line range does not exceed the specified constraint range. The inner diameter of a magnet coil is not less than 800mm, the magnetic field intensity of a central area of the magnet is not less than 14T, the magnetic field uniformity peak-to-peak value in a spherical area with the diameter of 400mm does not exceed 10ppm, and the axial direction of a 5-gauss line range does not exceed + / -10m and the radial direction does not exceed + / -8m.

Description

technical field [0001] The invention belongs to the field of magnetic resonance engineering, and in particular relates to a high-field whole-body magnetic resonance imaging active shielding superconducting magnet and a design method. Background technique [0002] Higher magnetic field strengths are a development trend for MRI systems. The signal-to-noise ratio of the magnetic resonance imaging system increases with the increase of the magnetic field strength. With a powerful gradient system, it is possible to see finer tissue structures and significantly improve the ability to detect diseases. In addition to structural imaging, high-field magnetic resonance imaging can also image brain function, which is an indispensable tool for brain science, cognitive science, and neuroscience research. The multi-nuclide analysis function of high-field magnetic resonance can track the transformation of substances containing corresponding elements, display the metabolic process of the hum...

AI Technical Summary

Problems solved by technology

Although there are many challenges in the application of active shielding technology to high-field whole-body MRI systems, such as stress control, structural support, and low-temperature system manufacturing, compared with passive shielding, active shielding can save a lot of iron shielding and reduce the burden of shielding room infrastructure. and cost, and the magnetic field stability of the active shielding system is higher, and the magnet installation is less restricted by the site

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