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Subspace-based magnetic resonance spectrum rapid reconstruction method

A magnetic resonance and subspace technology, which is applied in the field of fast reconstruction of magnetic resonance spectroscopy based on subspace, and achieves the effects of similar reconstruction errors, fast reconstruction speed, and short reconstruction time.

Active Publication Date: 2020-08-14
XIAMEN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of how to quickly reconstruct high-quality spectrum, and provide a subspace-based fast reconstruction method for magnetic resonance spectrum that requires less sampling data

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  • Subspace-based magnetic resonance spectrum rapid reconstruction method
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  • Subspace-based magnetic resonance spectrum rapid reconstruction method

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Embodiment Construction

[0035] The following embodiments will further illustrate the present invention in conjunction with the accompanying drawings.

[0036] The specific implementation process is as follows:

[0037] Step 1: Obtain the undersampled 2D MR free decay signal

[0038] In this embodiment, the size of the two-dimensional magnetic resonance spectrum data is 1466×170. The sampling template undersamples the above-mentioned two-dimensional magnetic resonance free attenuation signal with a size of 1466×170 in the time domain, and fills the unsampled data points with zeros to obtain the signal as It reconstructs the signal according to the indirect dimension.

[0039] Step 2: Construct an MR spectroscopy reconstruction model based on matrix decomposition Hankel matrix subspace

[0040] The measured data contains missing data and the signal is obtained after zero-filling the unsampled data points The total number of magnetic resonance spectrum data points in this embodiment is 249,220 point...

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Abstract

The invention discloses a subspace-based magnetic resonance spectrum rapid reconstruction method, and relates to a magnetic resonance spectrum reconstruction method. The method comprises the followingsteps: 1) acquiring an undersampled signal of a magnetic resonance signal, setting an undersampling scheme and experimental parameters of an experiment according to requirements on data in a magneticresonance experiment, and sampling through an undersampling operator so as to obtain the undersampled signal of the experiment; 2) proposing a magnetic resonance spectrum rapid reconstruction model based on a Hankel matrix subspace of matrix decomposition; 3) proposing a numerical solution algorithm of a subspace-based magnetic resonance spectrum rapid reconstruction model on the basis of the step 2); 4) dividing the rapid reconstruction model into two layers of iterative solution models to obtain an optimal magnetic resonance signal, and 5) carrying out post-processing on the free attenuation signal, and carrying out Fourier transform on the optimal magnetic resonance signal obtained through solution in the step 4) to obtain a spectrum. The method has similar reconstruction errors, shorter reconstruction time and high reconstruction speed compared with other typical high-precision spectrum reconstruction methods.

Description

technical field [0001] The invention relates to a magnetic resonance spectrum reconstruction method, in particular to a subspace-based fast reconstruction method of the magnetic resonance spectrum. Background technique [0002] Magnetic resonance spectroscopy is one of the important detection methods for molecular structure analysis and is used in biomedicine and physical chemistry. Accelerating data acquisition is one of the important developments in modern magnetic resonance spectroscopy. One of the methods is to undersample the time signal (also called free induction decay signal) of magnetic resonance spectroscopy to achieve the purpose of fast acquisition of signals, and use appropriate methods to Reconstruction of undersampled signals (Xiaobo Qu, Maxim Mayzel, Jian-Feng Cai, Zhong Chen, Vladislav Orekhov. "Accelerated NMR spectroscopy with low-rank reconstruction, Angewandte Chemie International Edition", 54(3):852-854, 2015; Xiaobo Qu, Yihui Huang, Hengfa Lu, Tianyu ...

Claims

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Application Information

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IPC IPC(8): G06F17/14G06F17/16G06K9/00G01R33/20
CPCG06F17/14G06F17/16G01R33/20G06F2218/22
Inventor 郭迪詹嘉莹涂章仁
Owner XIAMEN UNIV OF TECH