Acoustoelectric Imaging Method Based on Establishing Standard Values

Abstract

The invention relates to an acoustic-electric imaging method based on standard value building. The method comprises the steps of arranging m discrete electrode arrays at the boundary of a field domain to be tested; arranging a focused ultrasonic disturbance mechanism, and dividing focus areas; obtaining a standard library Stb of boundary measured value changes of an empty field; obtaining a standard library Sto of boundary measured value changes when each focus area is object conductivity; under the actual measured field condition, obtaining boundary voltage measured values obtained after non-ultrasonic disturbance and ultrasonic disturbance are performed on the nth focus area, and calculating the variable quantity of boundary measured values obtained before and after focusing; obtaining the similarity dbn of the field to be tested and the empty field and the similarity don of the field to be tested and a field of objects; comparing the two similarities, and reestablishing binarization conductivity information of the whole object field.

Description

technical field [0001] The invention belongs to the field of imaging technology, and relates to a hybrid imaging technology of multiple physical fields, in particular to an acoustoelectric imaging method based on establishing standard values. Background technique [0002] Electrical impedance tomography (Electrical Impedance Tomography, EIT) is a new type of measurement technology, which obtains the distribution of electrical characteristics in the sensitive field by electrical means, and then reconstructs the distribution of the object field. This technology adopts a non-radiation and non-invasive method, which makes the imaging system fast in response, simple in structure, good in transplantation performance and low in cost, so it has a wide range of applications in the fields of medicine and industry. In recent years, EIT technology has made great progress. [0003] However, there is serious ill-posedness in the process of solving the EIT inverse problem, resulting in lo...

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Problems solved by technology

[0013] The current literature mentions that the power density is used as an intermediate quantity to reconstruct the conductivity distribution of the measured object field. In 2008, HAmmari et al. (Electrical impedance tomography by elastic deformation, H Ammari, E Bonnetier, Y Capdeboscq, M Tanter and M Fink, SIAM Journal on Applied Mathematics, 2008, 68: 1557-1573) first proposed to use energy density information as an intermediate quantity for image reconstruction, but since this method uses continuous wire electrodes for simulation verification, and discrete electrodes are used in practice, this method is in There are limitations in actual use

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