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Ultrasound CT image reconstruction method and system based on ray theory

A ray theory and ultrasound technology, applied in radio wave measurement systems, ultrasonic/sonic/infrasonic diagnosis, sonic diagnosis, etc., can solve problems such as large computational overhead, difficulty in solving, and difficulty in building an ultrasonic CT system.

Active Publication Date: 2019-07-26
WUHAN WESEE MEDICAL IMAGING CO LTD
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  • Application Information

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Problems solved by technology

The main reason is that there are several difficulties in this technology: it is difficult to build an ultrasonic CT system, and it is difficult to obtain data; the ultrasonic CT sound velocity reconstruction method involves large-scale matrix operations and requires a large amount of computing overhead; the ultrasonic CT sound velocity reconstruction process needs to solve a problem problem, so solving the inverse problem is a difficult point
[0006] There are several difficulties in the ultrasonic CT sound velocity reconstruction method based on ray theory: it is difficult to accurately extract the transit time, and it is greatly affected by noise and system errors; there are many calculation methods for ray paths, and their applicability is different for different application scenarios; Need to solve an inverse problem, the solution of the inverse problem is a difficult point

Method used

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Embodiment 1

[0067] The sound velocity reconstruction method based on ray theory in the present invention is to properly process the transmission data collected by the ultrasonic CT system, and finally reconstruct the ultrasonic sound velocity image. The steps include the extraction of transit time, the calculation of the ray path, and the solution of the inverse problem , the display of the speed of sound image.

[0068]The collected data comes from the ultrasonic CT hardware system. The hardware system mainly includes an ultrasonic probe, a transmitting circuit module, a receiving circuit module, a data acquisition module, and a computer system. The connection relationship between them, the cooperative working method, etc. can directly refer to the existing technology, such as the literature (Junjie Song, S.W.L.Z., A Prototype System for Ultrasound Computer Tomography with Ring Array, in International conference Biomedical Image and signal processing. 2017). Hardware modules such as the ...

Embodiment 2

[0084] Similar to Embodiment 1, the attenuation coefficient reconstruction method based on ray theory in the present invention includes:

[0085] The attenuation coefficient reconstruction method based on ray theory in the present invention is to properly process the transmission data collected by the ultrasonic CT system, and finally reconstruct the ultrasonic attenuation image. The steps include the extraction of signal energy parameters, the calculation of ray paths, and the inverse problem. Solving, display of the attenuation coefficient graph.

[0086] The energy parameter can be the amplitude, strength, energy of the signal.

[0087] The calculation of the ray path is the same as that in Embodiment 1.

[0088] The solution to the inverse problem is the same as in Example 1.

[0089] After the path calculation is completed, the path-attenuation-energy parameter equation group is constructed, as shown in the following formula (4), where ΔA is the variation of the attenua...

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Abstract

The invention belongs to the technical field of functional imaging, and discloses an ultrasound CT image reconstruction method and system based on a ray theory. The method comprises an ultrasound CT sound velocity reconstruction method and an ultrasound CT attenuation coefficient reconstruction method based on the ray theory. The ultrasound CT sound velocity reconstruction method based on the raytheory includes: (1) extraction of the difference in transit time; (2) calculation of a ray path of sound wave from a transmitting element to a receiving element; (3) solving of an inverse problem: using the quasi-Newton method to solve the path-slowness-time equation to obtain the velocity reconstruction value vector of an object to be tested. By means of improvement of the overall flow of the method, in particular the optimization of the ray theory, the fast stable ultrasonic CT sound velocity reconstruction and ultrasonic CT attenuation coefficient reconstruction can be achieved by utilizing the specific ray calculation treatment mode, and the ultrasound CT image reconstruction based on the ray theory can be further achieved.

Description

technical field [0001] The invention relates to a transmissive ultrasonic imaging mode in ultrasonic tomographic imaging, which belongs to the technical field of functional imaging, and more particularly relates to an ultrasonic CT image reconstruction method and system based on ray theory. Background technique [0002] Ultrasonic CT refers to transmitting ultrasonic waves to an object through an ultrasonic probe and receiving reflection data or transmission data, and using these data to reconstruct ultrasonic tomographic images in order to observe three-dimensional information inside the object. Ultrasonic detection has the advantages of low price and harmless to human body. With the rapid development of probe processing technology and high-performance computer computing, ultrasonic tomography has become a research hotspot again in recent years. [0003] Ultrasound CT imaging has two imaging modes, reflection imaging and transmission imaging. Due to the acquisition of mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/15
CPCA61B8/15A61B8/5207A61B8/0825A61B8/14G06T11/006G01S7/52036G01S15/8977G06T11/003
Inventor 尉迟明丁明跃方小悦武云宋俊杰周亮张求德刘阔林
Owner WUHAN WESEE MEDICAL IMAGING CO LTD
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