Permanent magnet type longitudinal gradient coil based on 0-1 integer programming
A gradient coil and integer programming technology, which is applied in the direction of measuring magnetic variables, measuring devices, instruments, etc., can solve the problems that it is not easy to impose constraints, and it is difficult to obtain the global optimal solution of coil performance parameters, so as to achieve convenient constraints, coil inductance, etc. The effect of small and good gradient magnetic field linearity
Active Publication Date: 2018-11-13
CHINA JILIANG UNIV
View PDF7 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0008] In view of this, the purpose of the present invention is to provide a permanent magnet type longitudinal gradient coil based on 0-1 integer programming that is convenient for finding the global optimal solution of the coil performance parameters, so as to solve the existing constraints in the prior art that are not easy to impose , the technical problem that it is difficult to obtain the global optimal solution of the coil performance parameters
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0048] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.
[0049] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.
[0050] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a permanent magnet type longitudinal gradient coil based on 0-1 integer programming so that a problem of a separated wire wrapping method can be solved. A region in which a coil is located is divided into a plurality of one-dimensional grids and the centers the grids are taken as the radius of a to-be-calculated circular current ring; a current I of a circular coil is given; if a circular current ring at a certain place makes a contribution to the magnetic field, the variable is 1 and the current is 1*1; and if no contribution is made, the variable is 0 and the currentis 0. The calculation based on the method is simple and direct; the coil inductance minimization or using material minimization is used as an objective; the high gradient magnetic field linearity canbe easily realized; and the constraint of the coil pitch can be applied conveniently.
Description
technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a permanent magnet longitudinal gradient coil based on 0-1 integer programming. Background technique [0002] Magnetic resonance imaging is an imaging technique based on the phenomenon of nuclear magnetic resonance. Gradient coils are an important part of the magnetic resonance imaging system. They are used to generate linearly changing magnetic fields along three orthogonal directions in the imaging area, which are respectively applied to slice selection, phase encoding and frequency encoding, so as to provide positioning basis for image reconstruction. . The structure of the gradient coil mainly includes a closed cylindrical structure and an open planar structure. [0003] At present, most permanent magnetic resonance imaging systems adopt an open planar disk structure, and superconducting magnetic resonance imaging systems mostly adopt a closed cylindrical...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/385
CPCG01R33/385
Inventor 李霞郑思杰刘晓芳徐文龙
Owner CHINA JILIANG UNIV