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An ultrasonic imaging synchronous algebra iterative reconstruction method based on total variation regularization constraint

An iterative reconstruction, ultrasound imaging technology, applied in image data processing, 2D image generation, image generation, etc., to achieve the effect of improving imaging accuracy, improving accuracy, clear and accurate inclusion shape and structure

Active Publication Date: 2019-04-09
TIANJIN UNIV
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Problems solved by technology

The need for higher precision ultrasound imaging and the distribution of inclusions with a weaker acoustic impedance ratio form a big contradiction

Method used

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  • An ultrasonic imaging synchronous algebra iterative reconstruction method based on total variation regularization constraint
  • An ultrasonic imaging synchronous algebra iterative reconstruction method based on total variation regularization constraint
  • An ultrasonic imaging synchronous algebra iterative reconstruction method based on total variation regularization constraint

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Embodiment Construction

[0040] The non-uniform shape constraint-based pixel range filtering ultrasound imaging algorithm of the present invention will be described with reference to the drawings and embodiments.

[0041] The ultrasonic imaging synchronous algebraic iterative reconstruction method constrained by total variation regularization of the present invention, in the embodiment, aims at the imaging of oil-water two-phase flow in industrial oil pipelines, which is a common application form of UT technology, using the overlapping area coefficient matrix based on geometric position correction The construction method represents the forward problem model of ultrasonic visualization detection of weak acoustic impedance ratio two-phase flow. At the same time, a regularized weighted least squares framework is built in the iterative solution process of the image reconstruction inverse problem, and the synchronous algebraic iterative method is included in the algebraic term. The regularization term inclu...

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Abstract

The invention relates to an ultrasonic imaging synchronous algebra iterative reconstruction method based on total variation regularization constraint, which is used for ultrasonic tomography and comprises the following steps: acquiring a projection attenuation measurement value required by reconstruction; Constructing a coefficient matrix, and considering the geometric position of the overlapped region relative to the field domain pixel while considering the overlapping area ratio of the projection path to the field domain pixel; Performing imaging preprocessing by using a synchronous algebrareconstruction method; Establishing a regularization weighting least square method framework, regularizing the total variation as a regularization item, taking a synchronous algebraic iterative reconstruction method as an algebraic item, and carrying out inverse problem iterative reconstruction calculation; And performing iteration until the residual error meets the requirement.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic tomography, and is used for realizing the reconstruction of the distribution attenuation coefficient of a weak acoustic impedance ratio 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 soft-field imaging techniques such as electrical impedance tomography (EIT) and electromagnetic tomography (Magnetic Impedance Tomography, MIT), UT has the advantages of non-invasiveness and high resolution. Imaging technologies such as X-ray Computed Tomography (X-CT) and Optical Coherence Tomography (OCT), UT are safe to use, simple in structure, and can realize re...

Claims

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/006G06T2211/424
Inventor 董峰刘皓谭超
Owner TIANJIN UNIV
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