Self consistency based parallel magnetic resonance imaging quick reconstructing method

A magnetic resonance imaging and consistent technology, applied in the measurement of magnetic variables, measurement devices, instruments, etc., can solve the problems of poor reconstruction quality of POCS and long reconstruction time of NLCG algorithm.

Inactive Publication Date: 2016-10-12
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, the reconstruction quality of POCS is not good,

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  • Self consistency based parallel magnetic resonance imaging quick reconstructing method
  • Self consistency based parallel magnetic resonance imaging quick reconstructing method
  • Self consistency based parallel magnetic resonance imaging quick reconstructing method

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[0045] Further describe the technical scheme of the present invention in detail below in conjunction with accompanying drawing:

[0046] The present invention is an efficient reconstruction method proposed based on the SPIRiT framework.

[0047] SPIRiT is a self-calibration-based parallel imaging reconstruction method that interpolates the missing frequency points during subsampling on a coil-by-coil basis. In SPIRiT, an interpolation kernel g ijIt is obtained by calibrating the data fully sampled in the center of the frequency domain (usually called a self-calibration signal). if x i represents the entire frequency-domain data of the i-th coil, then the calibration-based consistency criterion can be written as:

[0048] x i = Σ j = 1 C g i j * x ...

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Abstract

The invention discloses a self consistency based parallel magnetic resonance imaging quick reconstructing method. Based on an SPIRiT frame, aiming at a JTV and JL1 composite regular term contained parallel imaging reconstruction problem, the invention proposes a quick reconstructing method employing Descartes sampling. In the prior art, scanning time can be reduced distinctively by adopting the magnetic resonance imaging technology; however, the reconstructing time of a prior reconstructing algorithm is long. The method provided by the invention utilizing a split Bregman technology for dissolving a prior problem into a plurality of sub problems that are easy to solve. Experiment simulation results show that the new algorithm is greatly improved in convergence speed under the premise of ensuring reconstruction quality compared with a prior NLCG algorithm.

Description

technical field [0001] The invention relates to a fast reconstruction method of parallel magnetic resonance imaging based on self-consistency. Background technique [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) can provide good human soft tissue contrast, and has no radiation, so it has gradually become an indispensable imaging tool in modern clinical medicine. However, limited by physical and physiological factors, the acquisition speed of MRI signals is very slow. Parallel imaging is a common technique to increase acquisition speed. The introduction of SMASH and SENSE marks that parallel imaging has become a feasible technology. Parallel imaging uses multiple coils with different sensitivities to the magnetic resonance signal to simultaneously acquire magnetic resonance signals. The use of sensitivity information reduces the number of data used for reconstruction, thereby increasing the speed of acquisition. [0003] In the past ten years, many p...

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Application Information

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IPC IPC(8): G01R33/561
CPCG01R33/5611
Inventor 段继忠罗仁泽苏赋邓魁郑勉曹玉英汪敏
Owner SOUTHWEST PETROLEUM UNIV
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