Ultrasonic elastography property enhancement method

An ultrasonic elastography and performance technology, applied in ultrasonic/sonic/infrasonic diagnosis, sonic diagnosis, infrasonic diagnosis, etc., can solve problems such as error displacement propagation, amplitude modulation noise, etc., to suppress elastic image noise, image continuous smoothness, avoid Effect of Error Displacement Propagation

Inactive Publication Date: 2013-02-13
CHONGQING UNIV OF TECH
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Problems solved by technology

[0005] This algorithm has the following defects in practical application: (1) There will be error displacement propagation
At this time, still using the traditional gradient method for strain estimation will produce significant amplitude modulation noise

Method used

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  • Ultrasonic elastography property enhancement method

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] A method for enhancing the performance of ultrasound elastography, the method comprising the steps of:

[0037] (1) During the process of quasi-static tissue compression, the ultrasonic probe emits ultrasonic waves, and two frames of RF echoes before and after compression are taken and converted into baseband IQ signals;

[0038] (2) For the signal before compression, take the two-dimensional motion tracking window centered on the displacement estimation point;

[0039] (3) The initial iterative displacement of the tracking window in the first row is set to 0, that is, d’ m,1,0 = 0, where the subscript m represents the column number, 1 represents the first row, and 0 represents the initial iteration (0th);

[0040] (4) Use the two-dimensional phase root search displacement estimation algorithm to iteratively generate the first row of a...

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Abstract

The invention discloses an ultrasonic elastography property enhancement method which comprises the following steps of: selecting adjacent estimated high-quality reliable displacements as initial iteration displacements of a current window; iterating by using a two-dimensional phase root search displacement estimation improved algorithm and calculating a corresponding correlation coefficient; establishing a position corresponding to the displacement by using a two-dimensional window displacement position estimation improved algorithm, then correcting a displacement estimation value to a tracking window center point by using a linear interpolation method; carrying out longitudinal strain estimation by using a gradient method; and carrying out downsampling and gray scale mapping on a strain estimation matrix, scanning and converting to generate an elastic image. According to the ultrasonic elastography property enhancement method, the propagation of a wrong displacement can be avoided, the influence of tissue transverse motion and signal decorrelation to axial displacement estimation is reduced, the amplitude modulation noise caused by signal amplitude random fluctuation is inhibited, the imaging quality is improved, and the image property is enhanced so that an image is more continuous, smooth and clear.

Description

technical field [0001] The invention belongs to the technical field of medical ultrasonic elastography, and in particular relates to a method for enhancing the performance of ultrasonic elastography, which mainly includes displacement estimation and displacement correction technologies. Background technique [0002] Ultrasound (Ultrasound) elastography (Strain Imaging) is a new mode of medical ultrasound imaging, which mainly uses ultrasound to detect and image tissue mechanical characteristic parameters. When human tissue is pathologically affected, it usually manifests as a change in its mechanical parameters. When diseases such as breast cancer, prostate cancer, and liver fibrosis occur, the corresponding elastic modulus (hardness) changes. Elastography provides an important means for the detection and diagnosis of various diseases, especially tumors. [0003] The quasi-static compression method is a commonly used imaging method for ultrasound elastography. This method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/00
Inventor 崔少国彭彩碧黄贤英
Owner CHONGQING UNIV OF TECH
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