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Continuous wave ultrasonic tomography reconstruction method for correcting path tracking description

A technology of ultrasonic tomography and path tracking, which is applied in 2D image generation, image data processing, instruments, etc., and can solve problems such as fast data imaging speed

Active Publication Date: 2019-08-06
TIANJIN UNIV
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Problems solved by technology

Higher precision ultrasound imaging requirements and faster data imaging speed requirements form a big contradiction

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  • Continuous wave ultrasonic tomography reconstruction method for correcting path tracking description
  • Continuous wave ultrasonic tomography reconstruction method for correcting path tracking description
  • Continuous wave ultrasonic tomography reconstruction method for correcting path tracking description

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Embodiment Construction

[0033] The continuous wave ultrasonic tomography reconstruction method described in the modified path tracing of the present invention will be described with reference to the accompanying drawings and embodiments.

[0034] In the continuous wave ultrasonic tomography reconstruction method described in the modified path tracing of the present invention, in the embodiment, the common application form of the UPT technology, the imaging of the oil-water two-phase flow in the industrial oil pipeline, is calculated using the algorithm proposed by the present invention. In terms of positive problem description, continuous wave ultrasonic excitation is used to obtain accurate attenuation information of weak acoustic impedance than two-phase media, and the imaging results of attenuation distribution are used to map the sound velocity distribution for path tracing calculation. In terms of inverse problem reconstruction calculation, it is proposed to use virtual receiving transducers for ...

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Abstract

The invention relates to a continuous wave ultrasonic tomography reconstruction method for correcting path tracking description. The method comprises the following steps of acquiring a boundary measurement value; performing linear projection based on the relative geometric position of the transmitting-receiving probe to construct a coefficient matrix; performing imaging iterative calculation by using a synchronous algebraic reconstruction method to obtain the distribution of the attenuation coefficients in the field domain; carrying out image filtering on a result obtained in the step 3 by using a Gaussian filtering function; performing image enhancement on the result of the step 4 by using histogram equalization mapping; carrying out inclusion contour extraction on the result of the step5 by using a differential curvature method, judging whether each pixel point of the image corresponds to an inclusion contour or not by calculating an energy entropy function, and enabling the energyentropy function to be larger when the inclusion contour corresponds to the pixel point; solving sound velocity distribution according to the inclusion contour extracted in the step 6; performing pathtracking calculation on the given transmitting ultrasonic probe and the receiving ultrasonic probe; constructing a new coefficient matrix projection attenuation measurement value Tau and a coefficient matrix R; ending the iteration.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic tomography, and relates to the realization of a continuous wave ultrasonic imaging reconstruction method described by a modified path tracking method, which is used to realize the reconstruction of a low-contrast two-phase medium in a field. Background technique [0002] Ultrasonic Tomography (UT) is a structural imaging technology that reconstructs the measured field by arranging an ultrasonic sensor array outside the measured field and applying a certain excitation to obtain boundary voltage measurement data. Internal refraction coefficient, attenuation coefficient or acoustic impedance distribution. Compared with other soft-field imaging techniques such as Electrical Impedance Tomography (EIT) and Magnetic Impedance Tomography (MIT), UT has the advantages of non-invasiveness and high resolution. Field imaging technologies such as X-ray Computed Tomography (X-CT) and Optical Coherence Tomogr...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005
Inventor 董峰刘皓谭超
Owner TIANJIN UNIV
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