Biplanar open-type magnetic resonance imaging superconducting magnet system
A technology of magnetic resonance imaging and superconducting magnets, applied in superconducting magnets/coils, magnetic objects, measuring magnetic variables, etc., can solve problems such as insufficient openness, large stray field range, and low central magnetic field strength
Active Publication Date: 2015-03-18
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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[0005] The purpose of the present invention is to overcome the shortcomings of the existing open magnetic resonance superconducting magnet system, such as low central magnetic field intensity, large stray field range and insufficient openness, and propose a dual-plane open self-shielding magnetic resonance imaging superconducting magnet system
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[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0014] figure 1 It is a structural schematic diagram of an embodiment of a double-plane open magnetic resonance imaging superconducting magnet system of the present invention. like figure 1 As shown, the superconducting magnet system of the present invention is mainly composed of a superconducting main coil 6, a superconducting shielding coil 7, an upper cryogenic vessel 1, a lower cryogenic vessel 2, a first magnetic field correction iron ring 15, a second magnetic field correction iron ring 15', The shimming iron sheet 16, the room temperature shimming coil 17, the gradient coil 18, the radio frequency coil 19, and the refrigerator 20 are composed. Both the upper cryogenic vessel 1 and the lower cryogenic vessel 2 are composed of a liquid helium tank 12, a cold shield 13 and a vacuum vessel 14. In the upper cryogenic vessel 1 and the lower ...
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Abstract
The invention relates to a biplanar open-type magnetic resonance imaging superconducting magnet system, wherein superconducting main coils (6) and superconducting shielding coils (7) are respectively arranged in an upper low-temperature container (1) and a lower low-temperature container (2); the superconducting main coils (6) and the superconducting shielding coils (7) are symmetrically arranged in a manner relative to a central symmetrical plane (3) of the two low-temperature containers; a stepped groove (22) is formed in the surface of a vacuum container (14), which is close to the central symmetrical plane (3), in each of the upper low-temperature container (1) and the lower low-temperature container (2); a magnetic field rectifying iron ring (15), a shimming iron sheet (16), a room-temperature shimming coil (17), a gradient coil (18) and a radio frequency coil (19) are arranged in each groove (22); the shimming iron sheet (16) is arranged in a groove (23) in the surface of the vacuum container (14), which is away from the central symmetrical plane, in each of the lower low-temperature container and the lower low-temperature container; and a refrigerator (20) is arranged in the center of the groove (23) in the surface of the vacuum container (14), which is away from the central symmetrical plane, of the upper lower-temperature container (1).
Description
technical field [0001] The invention relates to an open magnetic resonance imaging superconducting magnet system. Background technique [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) generally needs to generate a highly uniform magnetic field distribution with a peak-to-peak nonuniformity of better than 20ppm (parts per million, ppm) within a sphere with a diameter of 40-50cm. The superconducting magnet system applied to the magnetic resonance imaging system needs to reasonably arrange superconducting coils in a small space, so that the uniformity of the spatial magnetic field generated by the superconducting coils meets the requirements, and at the same time makes the range of 5 Gauss stray fields smaller than the required range . [0003] There are two types of superconducting magnet systems for magnetic resonance imaging equipment, namely: the horizontal temperature hole type and the double plane open type. The horizontal temperature hole type supe...
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IPC IPC(8): H01F6/00H01F6/04H01F6/06G01R33/3815
Inventor 倪志鹏李兰凯王秋良严陆光王晖许建益
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI