Ultrasonic tomography method based on Bayesian regularization

A technology of tomography and ultrasound, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis and material analysis using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as difficulty in determining regularization parameters and improve image reconstruction. Quality, the effect of increasing solution speed and accuracy

Active Publication Date: 2017-11-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The present invention effectively solves the problem that the traditional Tikhonov regularization method is difficult to determine suitable regularization parameters, improves the solution speed and precision of the inverse problem of ultrasonic tomography, and improves the quality of image reconstruction

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  • Ultrasonic tomography method based on Bayesian regularization
  • Ultrasonic tomography method based on Bayesian regularization
  • Ultrasonic tomography method based on Bayesian regularization

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[0040] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Hereinafter, embodiments of the present invention will be described in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0041] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also ...

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Abstract

The embodiments of the present invention disclose an ultrasonic tomography method based on Bayesian regularization, and relates to the technical field of non-destructive detection. The ultrasonic tomography method can improve the calculation speed and the calculation precision of the inverse problem of ultrasonic tomography, and comprises: arranging an ultrasonic transmitter and a receiver, carrying out mesh dividing on a cross section to be detected, and obtaining ultrasonic tomography data; establishing the posterior probability density function pi (X, [sigma]2, [lambda]2|b) of a solution vector X under the support of an ultrasonic propagation time measurement value vector through layered Bayesian modeling; maximizing the posterior probability density function pi (X, [sigma]2, [lambda]2|b) of the solution vector X, and establishing an optimal condition equation set; solving the solution vector X, the [sigma]2 and the [lambda]2 by using a sequential Bayesian learning iterative algorithm, and adaptively determining an optimal regularization parameter; and obtaining the ultrasonic velocity value according to the solved solution vector X, and displaying in an image form. The ultrasonic tomography method of the present invention is suitable for the ultrasonic tomography of solids.

Description

technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to an ultrasonic tomography method based on Bayesian regularization. Background technique [0002] Tomography refers to the technique of reconstructing the internal (cross-sectional) information of an object from the data detected from the outside of the object. When the energy waves used in tomography are ultrasound waves, it is called ultrasound tomography. Assuming that the ultrasonic wave propagates in a straight line inside the object, then using the time delay or amplitude attenuation between the transmitter and the receiver, parameters such as the ultrasonic wave velocity or absorption characteristics inside the object can be reconstructed and displayed in the form of an image. Accurately reflect the internal conditions of solids and realize non-destructive testing of solids. [0003] In order to realize ultrasonic tomography of solids, it is necessary to ado...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/06
CPCG01N29/04G01N29/0672G01N2291/011G01N2291/023G01N2291/105
Inventor 严刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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