Design Method of Elliptical Cylindrical Transverse Gradient Coil Based on Space Transformation
A gradient coil and space transformation technology, applied in computing, special data processing applications, instruments, etc., can solve the difficulties in the design and application of elliptical cylindrical gradient coils, lack of accurate, fast, and efficient design of elliptical cylindrical gradient coils, elliptical There are few cylindrical gradient coils, etc.
Inactive Publication Date: 2016-08-24
HOHAI UNIV
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Problems solved by technology
At present, there are few studies on the design theory of elliptical cylindrical gradient coils, and the lack of accurate, fast and efficient design schemes for elliptical cylindrical gradient coils has brought certain difficulties to the design and application of elliptical cylindrical gradient coils.
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[0034] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0035] refer to figure 1 As shown, the present invention adopts the elliptical gradient coil structure to design the gradient coil, and provides an efficient design algorithm. The advantage of using the elliptical cylindrical gradient coil is that the space can be fully utilized, so that the performance of the two transverse gradient coils can be balanced as much as possible.
[0036] The elliptical cylindrical surface gradient coil in the present invention is designed by the flow function method, the elliptical cylindrical surface is transformed into a cylindrical surface through space transformation, and then a suitable current density basis function is constructed on the cylindrical surface. The design process is described as follows:
[0037] Assume that the long and short axes of the elliptical cylinder where the gradient coil is l...
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The invention discloses a method for designing an elliptic cylindrical surface transverse gradient coil based on spatial alternation. The method is characterized by comprising the steps that firstly, two shafts of the elliptic cylindrical surface where the gradient coil is located are defined to be in the direction x and the direction y, the shaft length of the elliptic cylindrical surface where the gradient coil is located in the direction x is 2a, the shaft length in the direction y is 2b, the wiring length in the axial direction is 2L, the strength of the gradient field is G, and the linearity is E; secondly, spatial alternation is utilized for converting the elliptic cylindrical surface into a cylindrical face, and the current density basis function and the expression are constructed under the cylindrical face; thirdly, a functional construction related to the current density is built, and the coefficient of the current density expression is obtained by solving the functional extreme value; fourthly, the solved coefficient of the current density expression is utilized for solving distribution of current density in the space, and the wiring shape of the gradient coil is obtained. The complex calculation of gradient coil designed through the network discrete method is avoided, and the high efficiency and precision are obtained.
Description
technical field [0001] The invention relates to a design method of a transverse gradient coil, in particular to a design method of an elliptical cylinder transverse gradient coil based on space transformation in a nuclear magnetic resonance imaging system. The invention belongs to the field of nuclear magnetic resonance imaging system component design. Background technique [0002] The gradient coil is one of the key components of the MRI system, and its main function is to provide the MRI system with alternating gradient magnetic fields in three orthogonal directions, so as to realize the spatial positioning of the imaged object. The structure of the gradient coil mainly includes two types: closed type and open type. [0003] The shape of the open gradient coil is a planar structure. Over the past few decades, permanent magnet-based NMR systems have dominated the market. The permanent magnet NMR system is generally an open system. Therefore, the research on the design a...
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IPC IPC(8): G06F17/50
Inventor 平学伟李黎韦耿李昌利陈嘉琪
Owner HOHAI UNIV