Inversion Method of Electromagnetic Properties of Human Body Based on Fast Volume Integral Equation and Magnetic Resonance

A technology of electromagnetic characteristics and magnetic resonance, applied in medical science, diagnosis, diagnostic recording/measurement, etc., can solve the problems of unreliable value at the tissue boundary, sensitive to noise, poor imaging resolution, etc., to reduce reconstruction time and suppress errors. , the effect of improving imaging resolution

Active Publication Date: 2019-02-01
XIAMEN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to address the unreliable value of the electrical property imaging (EPT) algorithm used in the prior art at the tissue boundary, which is more sensitive to noise, resulting in poor imaging resolution, and the amplitude information in magnetic resonance (MR) imaging. Separate imaging from phase information, and magnetic susceptibility imaging using phase information requires unwrapping and background field removal processing, providing a method for inversion of human electromagnetic properties based on fast volume integral equations and magnetic resonance

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  • Inversion Method of Electromagnetic Properties of Human Body Based on Fast Volume Integral Equation and Magnetic Resonance
  • Inversion Method of Electromagnetic Properties of Human Body Based on Fast Volume Integral Equation and Magnetic Resonance
  • Inversion Method of Electromagnetic Properties of Human Body Based on Fast Volume Integral Equation and Magnetic Resonance

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specific Embodiment approach

[0041] This embodiment is explained by taking the variational Born iterative algorithm (VBIM) as an example. The specific implementation is as follows:

[0042] 1) Measure the experimental data. Using magnetic resonance imaging technology to measure the human body, get B 1 + field. B 1 + The field is a forward rotation of the magnetic resonance radiofrequency field.

[0043] 2) Carry out iterative calculation, including the following steps:

[0044] ①Assume the initial electrical characteristic contrast χ E；(0) (r) and magnetic susceptibility χ H；(0) (r), carry out forward calculation, and solve E (0) (r) and H (0) (r).

[0045] ②Using the total electric field E(r) and total magnetic field H(r) of the n-1 iteration, perform inversion calculation to solve the χ of the n iteration E；(n) (r) and χ H；(n) (r).

[0046] ③The χ obtained by step ② E；(n) (r) and χ H；(n) (r), perform forward calculation, and solve the E of the nth iteration (n) (r) and H (n) (r).

[0...

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Abstract

The invention discloses a human body electromagnetic property retrieval method based on fast volume integral equation and magnetic resonance and relates to nuclear magnetic resonance imaging. By means of Born iterative algorithm or variation Born iterative algorithm or distorted Born iterative algorithm, fast Fourier transform, stable double conjugate gradient algorithm and conjugate gradient algorithm, forward and inversion iteration is conducted repeatedly till result convergence, human body electromagnetic property parameters are solved, human body electromagnetic property parameter magnetic resonance imaging is achieved, a two-dimensional or three-dimensional image showing human tissue electromagnetic property parameter distribution is obtained, and electromagnetic property parameter difference between different areas of tissue is presented and can be researched quantitatively. The method can be used for disease study, clinical diagnosis guidance and treatment medically.

Description

technical field [0001] The invention relates to nuclear magnetic resonance imaging, in particular to a human body electromagnetic characteristic inversion method based on fast volume integral equations and magnetic resonance. Background technique [0002] In 1991, Haacke first proposed NMR-based electrical property imaging (EPT). Electrical property imaging, like nuclear magnetic resonance, is a non-invasive imaging method, which uses nuclear magnetic resonance data to invert the distribution of electrical property parameters of tissues. Magnetic resonance detection is accompanied by thermal effects, which may cause harm to the human body, especially for high-field magnetic resonance detection to be developed in the future. The thermal effect is related to the distribution of electrical characteristic parameters of the human body. Understanding the distribution of electrical characteristic parameters can evaluate the magnetic resonance detection in advance. The thermal effe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/055
CPCA61B5/055A61B5/7253A61B5/7257
Inventor 柳清伙洪荣汉李胜男刘娜张建华
Owner XIAMEN UNIV
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