Magnetic resonance superconducting magnet for joint imaging

Abstract

The invention provides a magnetic resonance superconducting magnet for joint imaging. The superconducting magnet consists of superconducting positive coils (1, 2, 4) and superconducting negative coils (3), and all the coils are respectively axially-symmetrical solenoid coils taking a symmetry axis (7) as a center shaft. The superconducting positive coils (1, 2, 4) and the superconducting negative coils (3) are respectively arranged symmetrical about a symmetry plane (6), and are wound on the same skeleton; the superconducting magnet generates highly uniform magnetic field distribution in concentric spherical areas (8, 9, 10 and 11) with the four diameters of 100 mm, 120 mm, 140 mm and 160 mm respectively at central positions; and five Gaussian stray magnetic fields are respectively restricted in the ellipsoid ranges of 2.8 m and 3.8 m in the radial direction and the axial direction respectively. The magnetic resonance superconducting magnet for joint imaging adopts a single-skeleton structure, the assembly error of the magnet is reduced, and the liquid helium cavity volume of the superconducting magnet is reduced, and the using amount of liquid helium can be controlled within 30 liters.

Description

technical field [0001] The invention belongs to the technical field of applied superconductivity, and in particular relates to a magnetic resonance imaging superconducting magnet. Background technique [0002] Magnetic resonance imaging (MRI) is a high-tech imaging technology that utilizes the NMR properties of the magnetic nuclei (mainly hydrogen nuclei) of organisms in a magnetic field. Magnetic resonance imaging (MRI) equipment is mainly composed of a main magnet, a scanning bed, a gradient coil, a radio frequency coil, a spectrometer system, a control cabinet, a man-machine dialogue console, a computer, and an image processor. [0003] The main magnet is the main component of the MRI equipment, which is used to generate a uniform static magnetic field, which determines the image quality and work efficiency of the MRI equipment. At the same time, the main magnet is also the part with the largest manufacturing cost and the highest operating cost in the MRI equipment. MRI...

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Problems solved by technology

[0004] Because the leakage magnetic field distributed outside the superconducting magnet system will have adverse effects on the surrounding environment, such as a magnetic field of the order of 10 Gauss, it may cause some electronic equipment to malfunction, and make patients with cardiac pacemakers lifeless Dangerous, a magnetic field on the order of 100 Gauss may cause the computer system to work abnormally, so considering the restrictions on leakage magnetic fields in some places, it is necessary to limit the stray field range of superconducting magnets

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