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A method and system for ultrasonic CT image reconstruction based on Fermat's principle

A principle, ultrasonic technology, applied in ultrasonic/sonic/infrasound image/data processing, ultrasonic/sonic/infrasonic Permian technology, image data processing, etc., can solve problems such as limited bandwidth

Active Publication Date: 2020-06-02
WUHAN WESEE MEDICAL IMAGING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited bandwidth of clinical ultrasound probes, the propagation path of ultrasound is not actually a zigzag line

Method used

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  • A method and system for ultrasonic CT image reconstruction based on Fermat's principle
  • A method and system for ultrasonic CT image reconstruction based on Fermat's principle
  • A method and system for ultrasonic CT image reconstruction based on Fermat's principle

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Effect test

Embodiment 1

[0118] Taking the phantom as the object to be measured, the sound velocity reconstruction method based on the Fermat principle 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 specific processing steps include the extraction of transit time , the preparation for the start of the iteration, the calculation of the fat ray path during the iteration, the solution of the inverse problem, the judgment of whether the iteration is terminated, and the display of the further sound velocity image.

[0119] The present invention collects data using a circular array probe, and utilizes a single-shot full-connect mode, that is, one array element transmits, all array elements receive, and all array elements are sequentially transmitted. Assuming that there are T array elements, T 2 data records. The transmitted wave is mainly received by the array element opposite to t...

Embodiment 2

[0135] The attenuation coefficient can be reconstructed based on the processing principle and processing steps similar to those for reconstructing the sound velocity in Embodiment 1.

[0136] Taking the same circular array probe as an example, firstly, using the single-shot all-connect mode, the T 2 Energy parameter data records. The transmitted wave is mainly received by the array element opposite to the transmitting array element position, so the present invention adopts the array element in the range of 180 degrees opposite to the transmitting array element (that is, the transmitting array element is directly opposite ±90 degrees, within a total of 180 degrees, and a total of T / 2 array elements) to reconstruct the attenuation coefficient from the received energy parameter data, that is, from T 2 Select T×T / 2 pieces of energy parameter data from the data records to obtain the column vector P of the energy parameter, and the total number of rows of P satisfies (T×T / 2).

[...

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Abstract

The invention belongs to the technical field of functional imaging, and discloses an ultrasonic CT image reconstruction method based on the Fermat principle and a system thereof. The method comprisesthe following steps: (1) extracting the transit time; (2) preparing to enter iteration; (3) calculating the time tau from each transmitting array element to each pixel point in the imaging area according to a finite difference method, and calculating a fat ray path according to the Fermat principle, wherein the width of the fat ray path is narrowing with the increase of the number of iterations; (4) solving an inverse problem, and updating a sound velocity value; and (5) judging whether iteration is terminated or not. By improving the whole process of the method, through path optimization andbased on the Fermat principle, especially the variable-parameter fat ray path with the path changing from wide to narrow, the ultrasonic CT sound velocity and attenuation coefficient reconstruction method and the system are fast and stable and have a better imaging effect.

Description

technical field [0001] The invention belongs to the technical field of functional imaging, and more specifically relates to an ultrasonic CT image reconstruction method and system based on Fermat's principle, which belongs to the transmission ultrasonic imaging mode in ultrasonic tomography, and can realize the reconstruction of ultrasonic CT sound velocity and attenuation coefficient. Background technique [0002] Ultrasonic CT is a tomographic imaging mode that uses ultrasonic probes to transmit and receive signals to generate reflection data and transmission data, and use these data to reconstruct ultrasonic tomographic images of different modalities in order to better observe the parameter information inside the object. Ultrasonic CT detection has the advantages of low cost and no radiation to the human body. With the rapid development of probe processing technology and high-performance computer computing, ultrasonic tomographic imaging technology has once again become a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B8/08G06T11/00
CPCA61B8/5215G06T11/003
Inventor 尉迟明丁明跃方小悦武云宋俊杰周亮张求德周权
Owner WUHAN WESEE MEDICAL IMAGING CO LTD
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