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Conductivity image reconstructing method for magneto-thermoacoustic coupled tomography

A technology of image reconstruction and conductivity, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as the inability to give conductivity distribution

Active Publication Date: 2015-03-25
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency that the existing magneto-thermoacoustic imaging method cannot provide the conductivity distribution, and propose a conductivity image reconstruction method based on the direct iteration of the linear Poisson equation for magneto-thermal-acoustic coupling imaging

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[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention is based on the principle of magneto-thermoacoustic imaging, and the electrical conductivity image reconstruction method of magneto-thermal-acoustic coupling imaging includes five steps:

[0036] The first step is to obtain the magneto-thermoacoustic signal of the conductive object; the second step is to obtain the thermal sound source distribution of the conductive object according to the sound pressure wave equation; the third step is to solve the scalar potential space component; the fourth step is to use the solved scalar potential space component to calculate New conductivity; the relative error between the conductivity set in the fifth step and the solved conductivity is calculated. If the requirements are met, the new conductivity is the solved conductivity; otherwise, the new conductivity is set as the initia...

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Abstract

A conductivity image reconstructing method for magneto-thermoacoustic coupled tomography includes: acquiring a thermoacoustic source distribution of a conductive object by means of time inversion according to an electromagnetic ultrasonic signal received, and performing reconstruction according to the thermoacoustic source distribution to obtain a conductivity distribution of the conductive object. Specially, the method includes: acquiring a thermoacoustic source on a certain level by means of time inversion, acquiring a thermoacoustic source of the conductive object by means of interpolation, performing calculation by means of Biot-Savart's law according to excitation current to obtain a spatial component A1 of primary magnetic vector potential, subjecting the conductive object to spatial discretization, giving an initial value [Sigma]<0> of conductivity, according to the theorem of current continuity, solving a spatial component [Phi] <1> of scalar potential with the initial value [Sigma]<0> and the spatial component A1, substituting the spatial component [Phi]<1> of the scalar potential to a relation which the thermoacoustic source and conductivity meet so as to obtain updated conductivity [Sigma]<1>, replacing the initial value [Sigma]<0> with the updated conductivity [Sigma]<1>, repeating the process above, and stopping iteration until a relative error of the conductivity meets an equation: Sigma=||([Sigma]1-[Sigma]0) / [Sigma]0||2<=Sigma0.

Description

technical field [0001] The invention relates to a method for reconstructing a conductivity image, in particular to a method for reconstructing a conductivity image of magneto-thermal-acoustic coupling imaging. Background technique [0002] At present, the sensitivity and spatial resolution of traditional electrical impedance imaging technology are not high, mainly because electrical impedance imaging usually uses electromagnetic waves with low frequency as excitation. Since the wavelength is much larger than the imaging object, the detection contrast of the electromagnetic field is high, but the resolution is low. Needless to say, a single field has its physical limitations. Therefore, multi-physics imaging technology has received more and more attention, that is, one physical field acts on biological tissue and converts it into another physical field for detection. One physical field provides resolution, and the other provides contrast. , achieving simultaneous improvemen...

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Application Information

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IPC IPC(8): A61B5/05
CPCA61B5/0536
Inventor 夏慧刘国强李士强夏正武杨延菊刘宇
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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