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Magnetic resonance human tissue electrical characteristic tomography method

A technology of human tissue and tomographic imaging, applied in diagnosis, diagnostic recording/measurement, medical science, etc., can solve problems such as large algorithm error, large noise influence, poor EPs imaging resolution, etc.

Active Publication Date: 2015-02-18
SHENZHEN BASDA MEDICAL APP
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Problems solved by technology

[0006] Aiming at technical problems such as the MR EPT used in the prior art has large error in the algorithm and is greatly affected by noise, resulting in poor imaging resolution of EPs, the invention proposes a MR EPT that can reduce the impact of noise and has high imaging resolution. Resonance tomography method of electrical properties of human tissue

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  • Magnetic resonance human tissue electrical characteristic tomography method
  • Magnetic resonance human tissue electrical characteristic tomography method
  • Magnetic resonance human tissue electrical characteristic tomography method

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Embodiment Construction

[0028] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] A kind of magnetic resonance human tissue electrical property tomography method proposed by the present invention, its embodiment is as follows:

[0030] First, introduce the and the process of.

[0031] in, Indicates the corresponding radio frequency field when the magnetic resonance radio frequency (coil) is emitted (specifically, it refers to the circularly polarized B1 magnetic field at the vector r), which is used below as Indicates the corresponding corresponding, Indicates the radio frequency field corresponding to the magnetic resonance radio frequency (coil) reception, which is used below Indicates that the jth receiving unit receives the corresponding That is to say and respectively as and A specific instance of , introducing and solution proc...

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Abstract

The invention relates to a human tissue physical characteristic parameter magnetic resonance tomography method. The method comprises the following steps: (1) calculating B1x(r), B1y(r) and B1z(r) according to B1<+>(r) obtained in a magnetic resonance radiofrequency field and B1<->(r) obtained through magnetic resonance proton density imaging in combination with a reciprocity principle and a magnetic field Gauss theorem; (2) substituting B1x(r), B1y(r) and B1z(r) into a magnetic resonance time-harmonic radiofrequency electromagnetic field FDTD (Finite Difference Time Domain) equation set, and correspondingly setting the initial values of the conductivity sigma(r) and capacity belong to (r) of each tissue in an imaging region as the average conductivity value and average capacity value of human body tissues to obtain E1x(r), E1y(r) and E1z(r); (3) performing repeated iterative operation till algorithm convergence, wherein the distribution of sigma(r) and belong to (r) of each tissue in the imaging region is the evaluated tissue electrical characteristic parameter distribution result; (4) outputting an image according to the tissue electrical characteristic parameter distribution result in the imaging region.

Description

technical field [0001] The invention belongs to the field of magnetic resonance imaging, and relates to a magnetic resonance tomography method for physical characteristic parameters of human tissue, in particular to a finite-difference time-domain (FDTD) iterative approximation method for solving electrical characteristic parameters of human tissue (including electrical conductivity and permittivity), realizes the magnetic resonance tomography method of the electrical characteristic parameters of human tissue, and the obtained distribution image of the electrical characteristic parameters of human tissue can be used to guide the ultra-early or early diagnosis of clinical tumors. Background technique [0002] The electromagnetic properties exhibited by matter in the electromagnetic field can be regarded as the inherent properties of matter, and human tissue is no exception. Human tissue exhibits certain electrical and magnetic properties in an electromagnetic field. Electric...

Claims

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Application Information

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IPC IPC(8): A61B5/055
CPCA61B5/0033A61B5/055
Inventor 辛学刚
Owner SHENZHEN BASDA MEDICAL APP
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