Second-order axial superconducting shim coils decoupled from the main magnet in magnetic resonance imaging systems

A technology of magnetic resonance imaging and shimming coils, applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems of large magnetic coupling and small optimization space, and achieve the effect of reducing magnetic coupling and multi-operation space

Active Publication Date: 2018-04-20
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing second-order axial superconducting shim coil has a large magnetic coupling with the main magnet and the space for optimization is small, and proposes a second-order axial superconducting shim coil that is decoupled from the main magnet in a magnetic resonance imaging system. superconducting shim coil

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  • Second-order axial superconducting shim coils decoupled from the main magnet in magnetic resonance imaging systems
  • Second-order axial superconducting shim coils decoupled from the main magnet in magnetic resonance imaging systems

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] figure 1 It is an embodiment of the second-order axial superconducting shim coil of the present invention. Such as figure 1 As shown, the second-order axial superconducting shim coil decoupled from the main magnet in the magnetic resonance imaging system is composed of forward superconducting shim coil 4 and reverse superconducting shim coil 5 .

[0016] The main magnet 3 is a spiral magnetic resonance magnet, the axis of symmetry 2 is the central axis of the main magnet 3, the center point 1 is the center point of the main magnet 3, and the imaging area 6 is a spherical area with the center point 1 as the center of the sphere. The forward superconducting shim coil 4 is composed of two pairs of solenoid coils 4.1 and 4.2 passing forward current. The reverse superconducting shim coil 5 is composed of two pairs of solenoid coils 5.1, 5....

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Abstract

The invention provides a second-order axial superconducting shim coil decoupled from a main magnet in a magnetic resonance imaging system. The second-order axial superconducting shim coil is composed of a forward superconducting shim coil (4) and a backward superconducting shim coil (5), and the second-order axial superconducting shim coil and the main magnet (3) share the same central axis and the central point. The forward superconducting shim coil (4) is composed of two pairs of solenoid coils (4.1, 4.2) to which forward current is introduced. The backward superconducting shim coil (5) is composed of two pairs of solenoid coils (5.1, 5.2) to which backward current is introduced. The maximum relative error between magnetic field intensity generated by the second-order axial superconducting shim coil in an imaging area (6) and ideal magnetic field intensity is not greater than 0.5%; and mutual inductance between the second-order axial superconducting shim coil and the main magnet is less than 3H.

Description

technical field [0001] The invention relates to a second-order axial superconducting shim coil of a magnetic resonance imaging system. Background technique [0002] In a Magnetic Resonance Imaging (MRI) system, the uniformity of the magnetic field in the imaging area directly affects the imaging quality. Therefore, in a high-precision MRI system, superconducting shim coils are used to monitor the uniformity of the magnetic field in the imaging area. fix. The whole set of superconducting shim coil system generally includes first-order and second-order superconducting shim coils, and some coils of third-order or even fourth-order superconducting shim coils are selected according to actual conditions. According to the shape of the generated magnetic field, superconducting shim coils are generally divided into axial superconducting shim coils and radial superconducting shim coils. When evaluating the magnetic coupling between the superconducting shim coil and the main magnet, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/3875
CPCG01R33/3875
Inventor 王秋良胡新宁朱旭晨李毅
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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