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Current injection type thermoacoustic imaging electrical resistivity rebuilding method

A current injection, thermoacoustic imaging technology, applied in ultrasonic/sonic/infrasound image/data processing, material impedance, ultrasonic/sonic/infrasonic Permian technology, etc., can solve the sensitivity and spatial resolution of electrical impedance imaging technology low level issues

Active Publication Date: 2017-06-23
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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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

Method used

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  • Current injection type thermoacoustic imaging electrical resistivity rebuilding method
  • Current injection type thermoacoustic imaging electrical resistivity rebuilding method
  • Current injection type thermoacoustic imaging electrical resistivity rebuilding method

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Embodiment Construction

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

[0043] The excitation source 1 is connected to the injection electrode A2 and the injection electrode B4 , and injects a current signal into the target body 3 . The ultrasonic transducer 5 and the target body 3 are coupled through a couplant, the output end of the ultrasonic transducer 5 is connected to the input end of the detection system 6, and the output end of the detection system 6 is connected to the upper computer 7, and the image is realized in the upper computer 7 reconstruction. The controller 8 realizes the rotational scanning motion control of the ultrasonic transducer 5 . The target body 3 , the injection electrode A2 , the injection electrode B4 and the ultrasonic transducer 5 are placed in the water tank 9 .

[0044] The principle of injection current thermoacoustic imaging is: inject current into the imaging target body through...

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Abstract

The invention relates to a current injection type thermoacoustic imaging electrical resistivity rebuilding method on the basis of current injection type thermoacoustic imaging principle. Pulse current is injected into an imaging objective object through an electrode; joule heat is generated in the imaging target body; heat expansion is caused; ultrasonic signals are generated; the ultrasonic signals are received by an ultrasonic transducer; the received ultrasonic signals are processed and collected; an electrical resistivity imaging rebuilding algorithm is used for obtaining the electrical resistivity image of the objective body. The method comprises the following concrete steps of 1, firstly obtaining the current injection type thermoacoustic signals; 2, rebuilding an objective body thermoacoustic source by using the obtained current injection type thermoacoustic signals; 3, rebuilding a vector potential by a nonlinear finite element solution method by using the thermoacoustic source; 4, rebuilding the specific resistance of the rebuilt current vector potential.

Description

technical field [0001] The invention relates to a resistivity image reconstruction method, in particular to an injection current type resistivity image reconstruction method. 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, and multiphysics imaging provides resolution by one physical field and contrast by another, enabling simultaneous improvements in contrast and resolution. The multi-physics imaging technology combining electromagnetic field and ultrasound takes into account the high contrast ratio of electromagnetic field to human tissue resistivity and the high-resolution characteristics of ultrasonic detection, and has become a research hotspot. Magneto-thermoacoustic imaging is an emerging multi- Physical Field Imaging Technology. [0003] Magneto-thermoacoustic imaging is a new electrical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/00G01N27/02A61B5/053A61B8/08
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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