Method for obtaining shortest length of magnetic resonance imaging superconducting magnet

A technology for magnetic resonance imaging and superconducting magnets, which is applied in the manufacture of superconducting magnets/coils, magnetic objects, inductors/transformers/magnets, etc., and can solve problems such as superconducting magnet constraints

Active Publication Date: 2014-11-19
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcoming that it is difficult to constrain the length of the superconducting magnet in the existing short-cavity magnetic resonance imaging superconducting magnet design method, and propose a method to obtain the pre-arranged coil area of ​​the magnetic resonance imaging superconducting magnet through cyclic iterative calculation The shortest length method

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  • Method for obtaining shortest length of magnetic resonance imaging superconducting magnet
  • Method for obtaining shortest length of magnetic resonance imaging superconducting magnet
  • Method for obtaining shortest length of magnetic resonance imaging superconducting magnet

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] The following is an embodiment of a method for obtaining the shortest length of a 1.5T magnetic resonance imaging superconducting magnet. The system parameters of the magnetic resonance imaging superconducting magnet are set to: the minimum inner diameter d of the pre-arranged coil area min and maximum outer diameter d max Set to 1.0m and 2.0m respectively; the imaging area is a sphere, its radial radius rdsv and axial radius zdsv are the same, both are set to 25cm, and the central magnetic induction of the imaging area is B 0 Set to 1.5T, the peak-to-peak uniformity Hp2p of the magnetic field in the imaging area is set to 10ppm; the stray field range of 5 Gauss is an ellipsoid, and the radial half length of the ellipsoid is r stray and the axial half-length z stray 3.0m and 4.0m respectively; the average current density J of the pre-a...

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Abstract

The invention provides a method for obtaining the shortest length of a magnetic resonance imaging superconducting magnet. Under the condition that the minimum inner diameter and the maximum outer diameter, the loaded average current density in a coil, the center magnetic induction strength in an imaging region, the size in the imaging region, uniformity of the magnetic field peak-to-peak value, the 5-gauss stray magnetic field range and other system parameters which are required by a magnetic resonance imaging superconducting magnet in the preset coil region are given, through coarse tuning steps of the fixed-length step length and self-adaptive steps of the variable-length step length are calculated in a loop iteration mode, and the shortest length of the preset coil region of the magnetic resonance imaging superconducting magnet is obtained. By means of the method, the openness of a magnetic resonance imaging system and comfort in the detection process of patients can be improved effectively.

Description

technical field [0001] The invention relates to a design method of a magnetic resonance imaging superconducting magnet. Background technique [0002] The superconducting magnet used in the magnetic resonance imaging system is capable of generating a spatial magnetic field with uniform distribution of axial magnetic induction intensity in an imaging area. For a whole-body imaging system, the general imaging area is a spherical area with a diameter of 40-50 cm, and the peak-to-peak unevenness of the magnetic field must be better than 20 ppm. The superconducting magnet of the magnetic resonance imaging system generally needs to reasonably arrange multiple pairs of solenoid coils in a pre-arranged coil area with a rectangular cross section. All the solenoid coils work together to generate a highly uniform spatial magnetic field distribution in the imaging area. The pre-arranged coil area of ​​rectangular cross-section is characterized by three parameters: minimum inner diameter...

Claims

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Application Information

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IPC IPC(8): H01F6/00H01F41/02
Inventor倪志鹏胡格丽王秋良
OwnerINST OF ELECTRICAL ENG CHINESE ACAD OF SCI