Method for reconstructing specific conductivity of thermoacoustic tomography based on current injection

A technology of injection current and thermoacoustic imaging, applied in the measurement of resistance/reactance/impedance, measurement of electrical variables, and analysis of solids using sonic/ultrasonic/infrasonic waves, which can solve the problems of low sensitivity and spatial resolution of electrical impedance imaging technology

Active Publication Date: 2017-08-18
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0002] Due to the limitation of excitation frequency, the sensitivity and spatial resolution of traditional electrical impedance imaging techniques are not high

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  • Method for reconstructing specific conductivity of thermoacoustic tomography based on current injection
  • Method for reconstructing specific conductivity of thermoacoustic tomography based on current injection
  • Method for reconstructing specific conductivity of thermoacoustic tomography based on current injection

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] The injection current thermoacoustic signal acquisition device involved in the reconstruction method of the present invention mainly includes four parts: an excitation system, a detection system, a controller and a target body. Such as figure 1 As shown, the excitation system includes a signal generator 1, a power amplifier 2, an injection electrode A4 and an injection electrode B6. The detection system includes an ultrasonic transducer 7 , a signal processor 8 , a data acquisition system 9 and an image reconstruction module 10 . The signal generator 1 drives the power amplifier 2, and injects a current signal into the target body 5 through the injection electrode A4 and the injection electrode B6. The ultrasonic transducer 7 and the target body 5 are coupled by a coupling agent, the output end of the ultrasonic transducer 7 is connect...

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Abstract

The invention provides a method for econstructing specific conductivity of thermoacoustic tomography based on the principle of current injection thermoacoustic tomography. A pulse current is injected into an imaging object via an electrode to generate joule heat in the imaging object, which then induces thermal expansion and generates an ultrasonic signal, the ultrasonic signal is received by an ultrasonic transducer and then processed and collected, and the specific conductivity images of the object is obtained by a specific conductivity image reconstruction algorithm. The specific steps are as follows: (1) obtaining a current injection type thermoacoustic signal; (2) reconstructing a thermoacoustic source of the object by using the obtained current injection type thermoacoustic signal; (3) reconstructing an electric scalar potential from the thermoacoustic source by a nonlinear finite element solution method; and (4) reconstructing specific conductivity by using the reconstructed electric scalar potential.

Description

technical field [0001] The invention relates to a conductivity image reconstruction method, in particular to a conductivity reconstruction method of injection current thermoacoustic imaging. Background technique [0002] Due to the limitation of excitation frequency, the sensitivity and spatial resolution of traditional electrical impedance imaging techniques are not high. A single field has its physical limitations. In multi-physics imaging, one physical field provides resolution, and the other provides contrast, so that both contrast and resolution can be improved at the same time. The multi-physics field imaging technology combining electromagnetic field and ultrasound has become a research hotspot because of the high contrast of electromagnetic field to human tissue conductivity and the high-resolution characteristics of ultrasonic detection. Magnetothermoacoustic imaging is an emerging multi-physics Physical field imaging technology. [0003] Magnetothermoacoustic ima...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G01N29/24G01R27/02
Inventor 李艳红刘国强夏正武杨延菊夏慧李士强
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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