Correcting method and correcting system for elastic rebuilding of magnetic resonance elastography (MRE)

A magnetic resonance elasticity and imaging technology, which is applied in the directions of using nuclear magnetic resonance image system for measurement, magnetic resonance measurement, and magnetic variable measurement, can solve the problems of errors and achieve the effect of accurate elastic reconstruction

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A magnetic resonance elasticity and imaging technology, which is applied in the directions of using nuclear magnetic resonance image system for measurement, magnetic resonance measurement, and magnetic variable measurement, can solve the problems of errors and achieve the effect of accurate elastic reconstruction

CN103064047AActive Publication Date: 2013-04-24SHENZHEN INST OF ADVANCED TECH

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[0033] In the reconstruction algorithm, the imaging object receives external excitation to generate shear waves, but reflected waves, etc., will be generated at the boundary of the imaging object, and what is collected is the superposition result of shear waves and emission waves. Generally, there are three situations for the boundary of the imaging object, namely: rigid boundary, free boundary and elastic constrained boundary. In the rigid boundary condition: the reflection has no waveform change, and the incident shear wave (longitudinal wave) only produces a reflected shear wave (longitudinal wave); in the free boundary condition: the reflected wave is related to the Poisson's ratio of the incident angle; in the elastic constraint Boundary conditions: The reflected wave is related to the incident angle, and also depends on the stiffness of the boundary and the wavelength of the incident wave.

[0034] Such as figure 1 As shown, in one embodiment, the elastic reconstruction and...

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Abstract

The invention relates to a correcting method and correcting system for elastic rebuilding of magnetic resonance elastography (MRE). The method comprises the following steps: acquiring a shear wave generated by an imaging object; comparing the size of the imaging object with the wavelength of the shear wave, and when the size of the imaging object and the wavelength of the shear wave are of an identical order of magnitude, the shear wave is introduced into a higher order term to correct an equation of motion and then obtain an objective function through calculation, wherein according to the objective function, gamma is the correction factor, mu is the lame constant, rho is the medium density, omega is the angular frequency of an incentive, and U is the displacement vector of a medium. According to the correcting method and correcting system for the elastic rebuilding of the MRE, through acquisition of the shear wave generated by the imaging object, comparison of the wavelength of the shear wave with the size of the imaging object and then adoption of an algorithm of the objective function, the elastic rebuilding can be relatively accurately achieved.

Description

Technical field [0001] The invention relates to a magnetic resonance elastography (Magnetic Resonance Elastography, MRE) technology, in particular to a method and system for elastic reconstruction and correction of magnetic resonance elastography. Background technique [0002] The elastic reconstruction algorithm is the most important part of the magnetic resonance elastography (MRE) process, which determines the spatial resolution and elasticity measurement accuracy of the MRE image. [0003] At present, the research of MRE elastic reconstruction algorithm mainly focuses on solving the Helmholtz algorithm. Assuming that the shear wave propagates in an isotropic infinite medium, and the influence of the longitudinal wave is ignored, the particle motion satisfies the Helmholtz equation Where U is the particle displacement, ρ is the medium density, ω is the angular frequency of the excitation, and μ shear modulus. [0004] At the same time, there are some other methods, such as local...

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Application Information

Patent Timeline

24 Apr 2013

Publication

CN103064047A

IPC: G01R33/56

Inventors: 蔡葳蕤; 朱燕杰