Ultrasonic CT sound velocity imaging method based on prior reflection imaging

Abstract

The invention discloses an ultrasonic CT sound velocity imaging method based on prior reflection imaging. The method comprises the steps of: obtaining raw data received by a piezoelectric ultrasonic transducer array; and using the original data to perform reflection imaging by using an aperture synthesis method to obtain a reflection image with higher resolution, and obtaining a position of a region occupied by a medium water; obtaining a travel time difference map; discretizing an object to-be-tested into N*N grids, obtaining a coefficient projection matrix by bilinear interpolation, and establishing a linear equation model with N*N unknowns; solving a linear equation model by total variation regularization, and obtaining the reconstruction result of the sound velocity in an area to-be-tested. The method not only greatly reduces the area to-be-reconstructed, but also improves the quality of the reconstructed image in an ultrasonic CT sound velocity imaging technology so as to be closer to the true sound velocity distribution.

Description

technical field [0001] The application belongs to the technical field of ultrasonic CT imaging in biomedical ultrasonics, and more specifically relates to a method for ultrasonic CT sound velocity imaging based on prior reflection imaging. Background technique [0002] Ultrasonic CT imaging examination method has the advantages of non-invasive, radiation-free, and does not depend on the operation of doctors, so it has a good application prospect. The basic starting point of this technology is to detect the structure distribution of the target body by sending and receiving ultrasonic waves. The received signal contains a large amount of information related to the medium parameters of the target body. Based on the signal detected by the sensor, we can reconstruct the medium parameter information of the target body we need through some corresponding algorithms. The commonly used sound velocity , attenuation coefficient, etc. [0003] Ultrasonic CT imaging has a variety of mod...

AI Technical Summary

Problems solved by technology

For example, the existing sound velocity imaging methods based on transmitted waves are more representative of joint algebraic reconstruction method (SART) and Tychonov regularization reconstruction method. influence, the reconstruction results are not accurate enough; the latter has higher requirements for the selection of regularization parameters, and the reconstruction results are often too smooth, easy to lose some key information, and generally cannot reach a satisfactory level

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