Hybrid design method for radio frequency coil

A hybrid design, radio frequency coil technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as inability to consider the impact

Inactive Publication Date: 2012-08-29
SOUTHERN MEDICAL UNIVERSITY
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Problems solved by technology

The inverse method is a common numerical method for analyzing electromagnetic fie

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  • Hybrid design method for radio frequency coil
  • Hybrid design method for radio frequency coil
  • Hybrid design method for radio frequency coil

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[0057] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments, but it does not impose any limitation on the present invention.

[0058] The hybrid design method of a radio frequency coil of the present invention includes the following steps:

[0059] (1) First establish a three-dimensional human body model in the FDTD domain;

[0060] Such as figure 1 The modeling schematic shown. The coil support shell is a cylindrical surface with a length of 2L of 50cm and a radius of 22cm. The cylindrical area taken by the equivalent surface has a length 2b of 40 cm and a radius c of 20 cm. The equivalent surface is wrapped with a three-dimensional digital human body model based on a real human body model.

[0061] The three-dimensional digital human body model is based on the CT tomographic image of the human body, using related software, such as the Mimics software of Materialise, Belgium, through artificial outline segmentati...

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Abstract

The invention provides a hybrid design method for a radio frequency coil, belonging to the technical field of magnetic resonance imaging, and comprising the following steps of: (1) establishing a three-dimensional human model in an FDTD (Finite Difference Time Domain); (2) presenting a target field in an internal target tissue region of a human load according to the magnetic field distribution requirement; (3) from the target field, performing a back calculation in consideration of the human load to obtain an electromagnetic field distribution; (4) based on the electromagnetic field distribution obtained in Step (3), re-establishing a target field defined in an inverse method; and (5) obtaining the current density on the surface of the coil according to the new target field. The method introduces the equivalence principle into a human model load for analysis design, considers the interaction relationship between the human load and the coil and effectively eliminates the interference influence, so that the coil is designed more precisely.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a hybrid method for designing a magnetic resonance radio frequency coil structure. Background technique [0002] The inverse method is an important method in the existing design methods of magnetic resonance radio frequency coils. When using this method to design a coil, it is first necessary to propose a target field according to the specific magnetic field distribution requirements, and obtain the current density on the surface of the coil through the target field, then use the current function technology to determine the layout of the coil loop, and finally carry out Necessary discretization or simplification to make it practical in engineering. FDTD (Finite-Difference Time-Domain) is also a commonly used numerical calculation method for electromagnetic fields. It adopts a discretization method of alternate sampling in space and time for the electric field...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 辛学刚陈武凡
Owner SOUTHERN MEDICAL UNIVERSITY
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