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Magnetic-resonance fast imaging method and system thereof

An imaging method and technology of an imaging system, which are applied in the directions of using a nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and magnetic variable measurement, etc., can solve the problems affecting the sparsity of the final coefficients, reconstruction errors, and cannot guarantee that the two sets of transformation bases are not correlated. problems, such as good non-correlation, improved accuracy and high precision

Active Publication Date: 2013-12-25
SHENZHEN INST OF ADVANCED TECH
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Problems solved by technology

However, when the method of combining the two sparse transformation methods is applied, since the two sparse transformations are carried out independently, the transformation bases are not constrained, and the non-correlation between the two sets of transformation bases cannot be guaranteed, thus affecting the sparseness of the final coefficients , resulting in reconstruction errors

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  • Magnetic-resonance fast imaging method and system thereof
  • Magnetic-resonance fast imaging method and system thereof
  • Magnetic-resonance fast imaging method and system thereof

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Embodiment Construction

[0045] In order to solve the problem of low precision of the current fast magnetic resonance imaging method, this embodiment provides a fast magnetic resonance imaging method. The method for fast magnetic resonance imaging will be specifically described below in conjunction with specific embodiments.

[0046] Please refer to figure 1 , the magnetic resonance fast imaging method provided in this embodiment includes the following steps:

[0047] Step S110: Acquire an initial image from the under-sampled K-space. Here, the data in the K-space is obtained by scanning the imaging object under different sequence parameters with a magnetic resonance scanner in advance, and the under-sampling template of each scan is different. Taking the parameter T2 (transverse relaxation time) in magnetic resonance imaging as an example, it is further explained as follows: collect L spin echo images corresponding to different echo times, and use different undersampling for the images collected at...

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Abstract

The invention relates to a magnetic-resonance fast imaging method. The magnetic-resonance fast imaging method comprises the following steps: (a) acquiring an initial image from an undersampled K space; (b) performing treatment on the initial image by fixed sparse conversion to get a sparse coefficient; (c) acquiring a dictionary related to the sparse coefficient and a coefficient corresponding to the dictionary based on the sparse coefficient and by virtue of non-related constraint self-adaptive sparse conversion; (d) reconstructing an image according to the dictionary and the coefficient corresponding to the dictionary; (e) updating data in the K space and judging whether the reconstructed image meets a termination condition or not, and if so, implementing the step (f), otherwise, returning to the step (a); and (f) fitting the reconstructed image to get a magnetic resonance parameter image. By adopting the magnetic-resonance fast imaging method, the precision in reconstruction of the image is improved to a certain extent. Simultaneously, the invention further provides a magnetic-resonance fast imaging system applying the magnetic-resonance fast imaging method. The system can obtain reconstructed images with high precision.

Description

technical field [0001] The invention relates to the field of magnetic resonance imaging, in particular to a fast magnetic resonance imaging method and system thereof. Background technique [0002] The theory of compressed sensing takes advantage of the sparsity of the signal, and only needs to collect a small number of samples to reconstruct the original data with high quality. In recent years, the theory of compressed sensing has been rapidly developed and applied in fast magnetic resonance imaging. Using this theory, the original image can be reconstructed from the under-sampled K-space, thereby reducing the number of samples collected in K-space, reducing the scanning time, and achieving The purpose of rapid magnetic resonance imaging. [0003] At present, fast magnetic resonance imaging methods based on compressed sensing theory are mainly divided into the following types: one is the reconstruction method based on fixed sparse transformation, and the commonly used fixed...

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Application Information

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IPC IPC(8): G01R33/56
Inventor 梁栋朱燕杰刘新郑海荣
Owner SHENZHEN INST OF ADVANCED TECH
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