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Real-time quasi-static ultrasonic elastography method

Ultrasonic elastography, quasi-static technology, applied in ultrasonic/acoustic/infrasonic diagnosis, acoustic diagnosis, infrasonic diagnosis, etc., can solve problems such as fast calculation speed, achieve the effect of improving calculation efficiency and reducing calculation amount

Inactive Publication Date: 2013-01-09
ZHEJIANG UNIV
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Problems solved by technology

Although these algorithms are relatively weaker than the time-domain cross-correlation algorithm in terms of stability, they have a fast calculation speed and can meet the requirements of real-time imaging.

Method used

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  • Real-time quasi-static ultrasonic elastography method
  • Real-time quasi-static ultrasonic elastography method
  • Real-time quasi-static ultrasonic elastography method

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experiment example

[0084] In the first group of experiments, computer simulation was used to establish a biological tissue parameter model, and a 20mm×20mm two-dimensional matrix material model was established through the finite element analysis software ABAQUS, as shown in figure 2 As shown, the center contains a circular hard block with a diameter of 7.5mm, the hardness of the central circle is 80kPa, and the hardness of the background material is 80kPa. Using the linear convolution model, two frames of ultrasonic radio frequency signal sequences are obtained through computer simulation. The displacement field distribution is calculated from two frames of ultrasonic radio frequency signals by applying this embodiment and the TDE method respectively, and the results are as follows image 3 as shown ( image 3 (a) is the result of this embodiment, image 3(b) is the result of the TDE method), it can be seen that this embodiment is not only superior to TDE in terms of calculation efficiency, b...

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Abstract

The invention discloses a real-time quasi-static ultrasonic elastography method. The real-time quasi-static ultrasonic elastography method includes: firstly, acquiring a multiframe ultrasonic radiofrequency signal; secondly, building a complex cross-correlation function; thirdly, determining a displacement field distribution plan and a strain distribution plan of the ultrasonic radiofrequency signal; and fourthly, generating a biological tissue strain distribution plan in real time. A complex model of the signal is built on the basis of phase domain information of the ultrasonic signal by the ultrasonic elastography method. The complex cross-correlation function of the signal is calculated to obtain a phase difference so as to calculate a displacement distribution value. The calculation of the real-time quasi-static ultrasonic elastography method compared with the existing imaging methods based on time-domain cross correlation is reduced evidently, calculating efficiency is improved greatly, and the real-time quasi-static ultrasonic elastography method is applicable to real-time imaging systems. In addition, by taking the advantage of the distribution continuality feature of biological tissue field and introducing prior time predicted values, the problem of phase difference disorder is solved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic imaging, and in particular relates to a real-time quasi-static ultrasonic elastic imaging method. Background technique [0002] Long-term clinical practice has found that changes in the hardness or elasticity of biological tissues often imply the occurrence of lesions, which is largely related to the molecular composition and combination of biological tissues. For example, common malignant diseases such as breast cancer, kidney cancer, prostate cancer, and liver metastases usually show tissue sclerosis, which is significantly harder than normal tissue before the lesion. Therefore, the hardness or elasticity information of biological tissues has very important reference significance for the detection of diseases, especially the detection and diagnosis of tumors. However, traditional medical imaging methods, including X-ray imaging, CT, MRI, and traditional B-ultrasound imaging, cannot directly ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/00
Inventor 袁金伟刘华锋
Owner ZHEJIANG UNIV
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