Method for reconstructing sound velocity image by virtue of optimized full wave inversion method

A technology of inversion method and sound velocity map, which is applied in the directions of ultrasonic/sonic/infrasonic image/data processing, ultrasonic/sonic/infrasonic diagnosis, sound wave diagnosis, etc., and can solve problems such as low efficiency and slow image speed

Inactive Publication Date: 2016-10-26
NANJING UNIV
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Problems solved by technology

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide an optimization method to improve the reconstruction speed and efficiency from the perspective of the algorithm and ensure the image quality in view of the slow speed and low efficiency of the existing full-wave inversion reconstruction sound velocity image

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  • Method for reconstructing sound velocity image by virtue of optimized full wave inversion method
  • Method for reconstructing sound velocity image by virtue of optimized full wave inversion method
  • Method for reconstructing sound velocity image by virtue of optimized full wave inversion method

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[0057] Such as figure 1 As shown, the present invention discloses a method for optimizing the full-wave inversion method to reconstruct the sound velocity image, comprising the following steps:

[0058] Step 1: Use the ultrasonic data acquisition equipment to sequentially complete the process of transmitting M signal sources individually and receiving all M sensors until all signal sources have transmitted once to obtain the measured sound pressure signal at the position of the sensor g m (r, t), where r is the sensor coordinate vector parameter, t is the time parameter, m represents the launch sequence, m=1, 2, ..., M, M also represents the total number of launches;

[0059] Step 2, according to the equipment used in step 1, completely simulate the transmitting and receiving process in step 1 on the computer as a forward function, so that the input variable is the sound velocity map matrix c, and the output variable is the sound pressure signal g recorded at the correspondin...

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Abstract

The invention discloses a method for reconstructing a sound velocity image by optimizing the full-wave inversion method, which comprises the following steps: using an ultrasonic data acquisition device to obtain a measured sound pressure signal at the location of a sensor; completely simulating the transmitting and receiving process on a computer as a forward function, the input variable of this function is the matrix of the sound velocity map, and the output variable is the norm of the difference between the sound pressure signal recorded at the corresponding position of the sensor and the measured sound pressure signal; enter the iterative process: give a sound velocity image as the initial image, make it Bring it into the above forward function as an independent variable to obtain the output norm; calculate the first-order gradient map of the forward function at the current position of the sound velocity map; solve the optimization problem by quasi-Newton method, update the original sound velocity map, and obtain a new The speed of sound map; use the new speed of sound map as the initial image to repeat the iterative process until the conditions are met to exit the iterative process and get the current speed of sound image.

Description

technical field [0001] The invention belongs to the field of medical ultrasound imaging and processing, in particular to an optimization method for sound velocity image reconstruction. Background technique [0002] After decades of research, the application of full-wave inversion and reconstruction technology in the medical field is also deepening. For example, in the reconstruction process of ultrasonic detection tomography, which is widely used in breast cancer detection, the image obtained by the reconstruction method of full-wave inversion has a very optimized spatial resolution, which is also stronger than the traditional Ray-Based reconstruction Technology, Ray-Based assumes that sound wave propagation has the refraction characteristics of light, so it cannot reconstruct the characteristics of the full waveform. However, because the full-wave inversion method itself requires a relatively long computing time and huge computer storage resources, this technology has not ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/00
CPCA61B8/52
Inventor 袁杰朱昀浩孙辉尤琦余双春王学鼎陶超刘晓峻
Owner NANJING UNIV
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