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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 virtue of an optimized full wave inversion method. The reconstruction method comprises the following steps: acquiring an actually measured sound pressure signal of the position where a sensor is located by virtue of ultrasonic data acquisition equipment; completely simulating a transmitting and receiving process on a computer so as to obtain a forward function, wherein an input variable of the function is a sound velocity image matrix and an output variable is the norm of a difference between a sound pressure signal, which is recorded on a corresponding position of the sensor, and the actually measured sound pressure signal; turning to an iterative process: providing a sound velocity image as an initial image, and introducing the initial image, as an independent variable, to the forward function, so that an output norm is obtained; calculating a first-order gradient image of the forward function on the position of a current sound velocity image; solving an optimization problem by virtue of a quasi-Newton method, and updating the original sound velocity images so as to obtain new sound velocity images; and repeating the iterative process by taking the new sound velocity images as initial images, and quitting the iterative process until conditions are met, so that a current sound velocity image is obtained.

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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