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Phase processing method for parallel magnetic resonance imaging

A technology of magnetic resonance imaging and phase processing, which can be used in magnetic resonance measurement, measurement using nuclear magnetic resonance imaging system, measurement using magnetic variables, etc., and can solve problems such as aliasing artifacts

Inactive Publication Date: 2015-07-01
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

However, in the case of signal acceleration sampling, there may be aliasing artifacts and amplified noise in the image reconstructed by the parallel MRI algorithm, so the artifacts and noise in the phase image after the amplitude weighted union are further amplified

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  • Phase processing method for parallel magnetic resonance imaging
  • Phase processing method for parallel magnetic resonance imaging
  • Phase processing method for parallel magnetic resonance imaging

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Embodiment

[0070] Through the method of the present invention, phase extraction and processing experiments are carried out on the K-space data collected by the multi-channel coil, and some of the experimental results are selected for analysis and comparison in this embodiment.

[0071] Through the water model and human brain transverse axis data pairs collected on the 3.0T Discovery MR750 (GE Healthcare, Waukesha, WI, USA) MRI equipment, the two sets of data in the present invention are collected from the 8-channel head phase control array of coils. The scanning sequence parameters for collecting water model data are: sequence name: two-dimensional gradient echo (GRE); repetition time (TR) / echo time (TE) = 35 / 20ms; flip angle (FA): 25°; field of view (FOV): 24×24cm 2 ; Acquisition matrix: 384×384; Number of layers: 10; Layer thickness: 5mm; Bandwidth (BW): 80Hz / pixel. The data acquisition parameters of the transverse axis of the brain are: sequence name: two-dimensional GRE; TR / TE=35 / 2...

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Abstract

The invention discloses a phase processing method for parallel magnetic resonance imaging. The phase processing method comprises the following steps of performing Fourier inverse transformation on K spacial data acquired by multi-channel coils in the parallel magnetic resonance imaging to obtain amplitudes and phases of all coil images; constructing a reference coil image, and estimating the spatial sensitivity distribution of all the coils in multiple channels; performing two-dimensional Fourier transformation on the spatial sensitivity distribution of the reference coil image, and intercepting an intermediate matrix as a convolution kernel; constructing a K spacial data convolution model, and solving a joint weight W of the coils; obtaining a K spacial value of a virtual coil and performing Fourier inverse transformation to obtain a virtual coil image; unwrapping a phase and removing the phase of the background of the virtual coil image; extracting the phase of a region of interest by using a mask image. According to the phase processing method disclosed by the invention, phase information of the image is acquired by combining K space with coil data, and the phenomenon that a phase information acquisition algorithm based on an image domain is influenced by noise and aliasing artifact in the reconstruction of the parallel magnetic resonance imaging under the condition of accelerated sampling is avoided.

Description

technical field [0001] The invention belongs to the technical field of magnetic resonance imaging, and in particular relates to a parallel magnetic resonance imaging phase processing method. Background technique [0002] Magnetic resonance imaging (MRI) has become one of the important means of clinical medical imaging due to its advantages of no ionizing radiation, good soft tissue contrast, high resolution and rich imaging parameters. In the process of magnetic resonance imaging, the collected signal is a complex-valued signal, and its amplitude image provides the distribution information of the spin protons, while the phase information can provide information about the moving speed of the spin protons, the inhomogeneity of the main magnetic field, and the magnetic properties of the tissue. sensitivity. Therefore, phase information has broad application prospects, such as phase contrast blood flow velocity measurement, proton resonance frequency temperature measurement, an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54
Inventor 郑倩张建伟张志峰马欢赵晓君宋胜利邓璐娟李玉华陈明谷培培马军霞刘育熙
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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