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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 fields, but this method alone cannot take into account the effects of the human body

Method used

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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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Embodiment Construction

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

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

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

[0060] Such as figure 1The schematic diagram of the modeling is shown. The coil supporting shell is a cylindrical surface, the length 2L is 50 cm, and the radius a is 22 cm. The cylindrical area taken by the equivalent surface has a length 2b of 40cm and a radius c of 20cm. The equivalent surface wraps 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 human CT tomographic images, using relevant software, such as the Mimics software of Belgium Materialise Company, through manual o...

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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...

Claims

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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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