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Magnetic-resonance elastic imaging reconstruction method and imaging system

A magnetic resonance elasticity, imaging system technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as time-consuming, and achieve the effects of high accuracy, strong operability, and precise elastic distribution

Active Publication Date: 2013-04-03
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

However, the direct inversion method needs to derivate the data and is more sensitive to noise; the finite element method can still obtain more accurate results in the case of 15% noise, but it uses an iterative method to solve it, which takes too much time

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  • Magnetic-resonance elastic imaging reconstruction method and imaging system
  • Magnetic-resonance elastic imaging reconstruction method and imaging system
  • Magnetic-resonance elastic imaging reconstruction method and imaging system

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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] see figure 1 The flow chart of the steps of the magnetic resonance elastography reconstruction method provided by the embodiment of the present invention includes the following steps:

[0033] Step S110: Acquire images using a three-dimensional multi-directional MRE sequence.

[0034] Step S120: Obtain a phase map based on the image, wherein the phase map contains a displacement vector U of the substance. It can be understood that since the phase diagram included in the image collected by MRE contains fluctuation images at different time points, the phase diagram is Fourier transf...

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Abstract

The invention relates to a magnetic-resonance elastic imaging reconstruction method which comprises the following steps: collecting images by a three-dimensional multidirectional MRE (mean relative error) sequence; acquiring a phase image based on the images, wherein the phase image contains the displacement vector U of an object; defining a first objective function in which U is the displacement vector, lambda and mu respectively are the lame constants in the longitudinal direction and the shearing direction, rho is the medium density, and omega is the angular frequency of excitation; calculating the first objective function to obtain a second objective function by an optimized problem solution method; and then adding constraint conditions to the second objective function to obtain a third objective function; solving the lame constant mu of the image in the shearing direction, and ensuring that the third objective function is the minimum. In addition, the invention also provides a magnetic-resonance elastic imaging system. The magnetic-resonance elastic imaging reconstruction method has high precision, the elastic distribution of tissues reappears precisely, and the precision of the elastic measurement is improved obviously.

Description

technical field [0001] The present invention relates to magnetic resonance elastography, in particular to a magnetic resonance elastography reconstruction method and an imaging system. Background technique [0002] Magnetic Resonance Elastography (MRE, Magnetic Resonance Elastography) is a new type of non-invasive imaging technology, which uses magnetic resonance (MRI) technology to detect the particle displacement of tissues in the body under the action of a certain external force, through the action of the motion sensitive gradient To obtain the MR phase image, and then use the reconstruction algorithm to obtain the elastic coefficient distribution map of each point in the tissue, as the basis for medical diagnosis. [0003] At present, the MRE elastic reconstruction algorithm mainly revolves around solving the Helmholtz equation. Assuming that the shear wave propagates in an isotropic infinite medium, and neglecting the influence of the longitudinal wave, the particle mo...

Claims

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Application Information

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IPC IPC(8): A61B5/055
Inventor 朱燕杰蔡葳蕤钟耀祖刘新郑海荣
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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