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Method for obtaining electrical performance parameter distribution of human tissues by virtue of magnetic resonance tomography

A technology for magnetic resonance tomography and human tissue, which is applied in the field of medical image processing and can solve the problems of boundary oscillation of numerical results, error of results, and inability to meet clinical measurement accuracy.

Active Publication Date: 2014-07-30
GUANGZHOU KOHEALA BIOTECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current hypothetical method of MR EPT technology results in large error when measuring the electrical parameters at the boundaries of different tissues, boundary oscillation occurs in the numerical results, low imaging resolution is common, and it cannot meet the clinical measurement accuracy.

Method used

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  • Method for obtaining electrical performance parameter distribution of human tissues by virtue of magnetic resonance tomography
  • Method for obtaining electrical performance parameter distribution of human tissues by virtue of magnetic resonance tomography
  • Method for obtaining electrical performance parameter distribution of human tissues by virtue of magnetic resonance tomography

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for obtaining electrical property parameters of human tissue by means of magnetic resonance tomography, comprising the steps of:

[0052] a. The human tissue is measured by high-field magnetic resonance equipment, and the components of the three rectangular coordinates of the radio frequency magnetic field B in the space coordinate system are obtained , with The distribution graph of , B is a vector function and , , with are plural;

[0053] It should be noted that, through high-field magnetic resonance various B1 field imaging (B1 Mapping) techniques, it can be measured , , , the specific measurement method belongs to common knowledge in the field, and will not be repeated here.

[0054] b. will , with Substituting the distribution diagram of Equation Ⅰ to obtain the recovery performance ;

[0055] ... (formula Ⅰ),

[0056] in, is the time harmonic factor, is a constant, is ...

experiment example

[0091] An experimental example is provided, which is as follows.

[0092] (1) Raw material selection:

[0093] The 16-channel 7T transmit-receive array coil is used as the high-field magnetic resonance coil. There are 16 transmit channels, and each transmit channel (element) is equipped with an amplifier with a power of 1 kilowatt (KW), and is equipped with a remote control. phase / amplitude gain unit.

[0094] (2) Solve the relative phase of each unit of transmitting and receiving:

[0095] When only one transmission channel is used to transmit, a series of 16 two-dimensional gradient echo (referred to as 2D GRE) images with small flip angles (flip angle) are obtained, and 16 channels are used to receive separately and simultaneously. In this way, the relative relationship between different coil elements (coil element) with The phase diagram is calculated, and the specific calculation steps are as follows:

[0096] 2.1 Deduced from the phase of the complex ratio of the ...

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Abstract

The invention discloses a method for obtaining the electrical performance parameter distribution of human tissues by virtue of magnetic resonance tomography. The method comprises the following steps of a, measuring the human tissues to obtain a distribution map of three rectangular coordinate components Bx, By and Bz of a radio frequency magnetic field B in a space coordinate system by using high-field magnetic resonance equipment; b, substituting the distribution map of Bx, By and Bz into Formula I to obtain a complex characteristic gamma, wherein Formula I refers to the Specification; c, separating the real part and virtual part of the complex characteristic gamma to obtain the electrical conductivity and permittivity of the human tissues respectively. The method is high in result accuracy, electrical characteristic differences between different tissues and between health and lesion tissues can be calculated, electrical characteristic parameter differences of tissues in human bodies can be provided, and bases can be provided for clinical lesion diagnosis.

Description

technical field [0001] The invention relates to a medical image processing method, in particular to a method for obtaining the distribution of electrical property parameters of human tissue by way of magnetic resonance tomography. Background technique [0002] Magnetic Resonance Electrical Properties Tomography (MR EPT) technology of human tissue is based on the traditional proton magnetic resonance imaging (Magnetic Resonance Imaging, MRI) technology, which can reflect the non-uniform electrical properties (Electrical Properties, EPs) distributed MR radiofrequency (Radiofrequency, RF) field, and then through a certain EPs algorithm to calculate the emerging MR imaging technology of EPs distribution in various parts of human tissue, which has attracted much attention in the field of MR research in recent years. [0003] Electrical properties, also known as dielectric properties, mainly refer to the electrical conductivity and permittivity of tissues, and magnetic properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055
Inventor 辛学刚
Owner GUANGZHOU KOHEALA BIOTECHNOLOGY CO LTD
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