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Imaging reconstruction method based on injected current thermoacoustic conductivity

A thermoacoustic conductivity and injection current technology, which is applied in image enhancement, image data processing, instruments, etc., can solve the problems of low sensitivity and spatial resolution of electrical impedance imaging technology

Active Publication Date: 2019-10-11
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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  • Imaging reconstruction method based on injected current thermoacoustic conductivity
  • Imaging reconstruction method based on injected current thermoacoustic conductivity
  • Imaging reconstruction method based on injected current thermoacoustic conductivity

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] The present invention is based on the injection current thermoacoustic conductivity image reconstruction method based on the direct iteration based on the injection current thermoacoustic imaging method. The current-injected thermoacoustic imaging method injects current into the imaging object through electrodes, generates Joule heat in the imaging object, causes thermal expansion, generates ultrasonic signals, and reconstructs thermal acoustic sources and electrical conductivity according to the detected ultrasonic signals.

[0046] The implementation process of the image reconstruction algorithm is as follows: figure 1 As shown, it can be described as: the first step is to obtain the thermoacoustic signal injected into the target body, that is, to detect the ultrasonic signal; the second step is to obtain the thermoacoustic source of t...

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Abstract

A drect iteration-based injection current type thermoacoustic conductivity image reconstruction method is disclosed and comprises the following steps: in a first step, injection current type thermoacoustic signals of an object body are obtained; in a second step, a time reversal method is used for obtaining a thermoacoustic source of the object body according to the thermoacoustic signals; in a third step, an initial value of conductivity is given, and an electric scalar potential is solved; in a fourth step, new conductivity is solved; in a fifth step, the conductivity is solved via iteration. The method comprises the following specific processes: the time reversal method is used for obtaining thermoacoustic source distribution on a certain fault plane, an interpolation method is used for obtaining an overall thermoacoustic source of the object body, the initial value [sigma]0 is given, the electric scalar potential [phi]1 is solved via the known [sigma]0 based on a current continuity theorem, the electric scalar potential [phi]1 is substituted into a relational expression for the thermoacoustic source and the conductivity, updated conductivity [sigma]1 is obtained, [sigma]0 is replaced with [sigma]1, and the above processes are repeated till relative error of the conductivity satisfies epsilon=||([sigma]i-[sigma]i-1) / [sigma]i-1||2<=epsilon0.

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 by injecting current. 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 imaging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
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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