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A System Matrix-Based Image Reconstruction Method of Magnetically Induced Magnetoacoustic Conductivity

A system matrix, image reconstruction technology, applied in ultrasonic/acoustic/infrasound image/data processing, image data processing, 2D image generation, etc., to achieve the effect of good anti-noise performance

Active Publication Date: 2021-09-28
INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a system matrix-based magnetic induction magnetoacoustic imaging system that makes full use of the eigenvalues ​​and eigenvectors with good anti-noise characteristics, and improves the solution of the forward and reverse problems of magnetoacoustic imaging on the basis of the system matrix model. Conductivity Image Reconstruction Method

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  • A System Matrix-Based Image Reconstruction Method of Magnetically Induced Magnetoacoustic Conductivity
  • A System Matrix-Based Image Reconstruction Method of Magnetically Induced Magnetoacoustic Conductivity
  • A System Matrix-Based Image Reconstruction Method of Magnetically Induced Magnetoacoustic Conductivity

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[0027] A system matrix-based magnetic induction magnetoacoustic conductivity image reconstruction method of the present invention will be described in detail below with reference to the embodiments and drawings.

[0028] A system matrix-based magnetic induction magnetoacoustic conductivity image reconstruction method of the present invention, such as figure 1 shown, including the following steps:

[0029] 1) Construct a conductivity simulation model with the improved CT Shepp–Logan structural model;

[0030] It is an improved CT Shepp–Logan structural model composed of 10 different ellipses. The outermost ellipse is removed to form a geometric model of 9 ellipses with different sizes and deflection angles. The CT value of each ellipse is modified to The corresponding conductivity values ​​constitute a conductivity simulation model for magnetic induction magnetoacoustic imaging research.

[0031] 2) Set the detection parameters of the acoustic transducer according to the expe...

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Abstract

A system-matrix-based method for image reconstruction of magneto-acoustic conductivity with magneto-induction: using the improved CT Shepp–Logan structure model to build a simulation model of conductivity; setting and detecting parameters of acoustic transducers according to experimental conditions, and constructing a system matrix of magneto-induction magnetoacoustic imaging; Based on the conductivity simulation model and the matrix of the magnetic induction magnetoacoustic imaging system, the ultrasonic sound pressure signal is obtained; the eigenvalues ​​and eigenvectors of the magnetic induction magnetoacoustic imaging system matrix are solved; the inverse system is calculated according to the eigenvalues ​​and eigenvectors of the magnetic induction magnetoacoustic imaging system matrix matrix, and obtain a reconstructed conductivity distribution image. The invention discards the eigenvalues ​​and eigenvectors that are greatly affected by noise, fully utilizes the eigenvalues ​​and eigenvectors with good anti-noise characteristics, and improves the solution of the forward and reverse problems of magnetoacoustic imaging on the basis of the system matrix model. The method of the invention can also be generally applicable to the reconstruction of experimental signal images of various acoustic inverse problems.

Description

technical field [0001] The invention relates to a conductivity image reconstruction method. In particular, it relates to a system matrix-based method for image reconstruction of magnetic induction magnetoacoustic conductivity. Background technique [0002] The basic principle of magnetic induction magnetoacoustic imaging is to place the tissue to be detected in a stable and constant magnetic field, and at the same time add a pulse-changing magnetic field with the frequency of the ultrasonic band in the same direction. According to the electromagnetic theory of Maxwell's equation, the changing magnetic field (can be a step magnetic field or Pulsed magnetic field) generates an induced current inside the tissue with conductivity. Under the action of the static magnetic field, the induced current is subjected to the Lorentz force in the vertical direction to excite the local particles of the tissue to vibrate. The frequency of the vibration is the same as the frequency of the ti...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/0522A61B5/0536A61B8/08G06T11/00
CPCA61B5/0522A61B5/0536A61B5/72A61B5/7203A61B8/085A61B8/4416A61B8/5207G06T11/003
Inventor 马任刘志朋殷涛
Owner INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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