First-order estimation method of motion speed of shear wave
A motion speed and shear wave technology, applied in complex mathematical operations, organ motion/change detection, acoustic wave diagnosis, etc., can solve the problems of inaccurate shear wave motion speed, poor stability, troublesome calculation process, etc., to reduce estimation error, increase the estimation rate, improve the effect of signal quality
Active Publication Date: 2020-02-21
SHANTOU INST OF UITRASONIC INSTR CO LTD
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Problems solved by technology
The calculation process is cumbersome, and the calculated displacement curve is affected by the signal-to-noise ratio of the ultrasonic signal and human motion, resulting in inaccurate and poor stability of the estimated shear wave velocity
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[0025] A first-order estimation method of shear wave velocity in the embodiment of the present invention uses a complex matrix of 4*9 arrays as the entry matrix For example, the specific operation process is as follows.
[0026] Firstly, the entrance data mediation is carried out, and different echo data acquired at different scanning positions at different scanning times during the ultrasonic testing process are formed into a data matrix. After orthogonal mediation, an entrance matrix with complex IQ data as data points is formed. Specifically, in the entrance data mediation step, the matrix row of the data matrix is the echo information at different scanning positions, and the matrix column is the echo information at the same position at different scanning times. The obtained entry matrix as follows.
[0027]
[0028] For the above entry matrix Calculate the complex angle value, and the matrix after mediating the entry data The complex IQ data of each data poin...
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The invention discloses a first-order estimation method of a motion speed of a shear wave. The first-order estimation method is used to perform primary estimation on a motion speed of a shear wave through the following steps: adjusting entrance data, calculating a complex angle value, calculating a matrix average value, solving an offset matrix, solving a displacement matrix, solving a shear wavemotion speed and the like. According to the first-order estimation method of a motion speed of a shear wave, a main profile of a displacement curve is extracted through a matrix orthogonal decomposition method, so that signal quality of shear wave estimation is improved. In addition, and the shear wave displacement curve can be directly estimated without twice estimation like in a conventional method, so that the purposes of reducing estimation error and improving estimation efficiency are achieved.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic shear wave elastography, and in particular relates to a first-order estimation method of shear wave velocity. Background technique [0002] Shear waves are used in a variety of diagnostic applications, such as assessing liver disease, where shear velocity can indicate tissue properties to allow detection of tumors or other sites. [0003] The conventional method for calculating the shear wave velocity is: [0004] The echo information of a specific point is obtained through ultrasound, and the instantaneous velocity of the particle is obtained through the echo information. This method of acquiring instantaneous motion is similar to the principle of ultrasonic detection of blood flow velocity. By the instantaneous velocity of motion, that is , to calculate the longitudinal displacement curve. Obtain displacement curves at multiple positions, and calculate the velocity of the shear wave th...
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IPC IPC(8): A61B8/08G06F17/16
CPCA61B8/085A61B8/5215G06F17/16A61B8/485A61B8/5207
Inventor 李德来范列湘黄伊楠李斌
Owner SHANTOU INST OF UITRASONIC INSTR CO LTD