Magnetic resonance imaging method and device, storage medium and medical equipment

Abstract

The invention provides a magnetic resonance imaging method and device, a storage medium and medical equipment, and is used for improving the imaging quality. The magnetic resonance imaging method comprises the steps of obtaining a sampling point set, wherein the sampling point set comprises a preset number of sampling points arranged according to a random time sequence under a Cartesian coordinatesystem in a phase encoding plane; generating a spatial coding gradient according to the sampling point set and a preset sampling track used for acquiring magnetic resonance signals; collecting original navigation data in a non-Cartesian coordinate system and located in a K space center area and imaging data in a Cartesian coordinate system and located on the periphery of the K space together in each repetition time based on the space coding gradient; converting the original navigation data into converted navigation data under the Cartesian coordinate system; and performing compressed sensingreconstruction on the converted navigation data and the imaging data to obtain a three-dimensional dynamic magnetic resonance image.

Description

technical field [0001] The present application relates to the technical field of magnetic resonance imaging, in particular to a magnetic resonance imaging method, device, storage medium and medical equipment. Background technique [0002] Magnetic resonance imaging (MRI) uses the principle of magnetic resonance imaging to enable people to obtain detailed diagnostic images of living organs and tissues without damage. However, the disadvantage of MRI is that the imaging speed is slow, and the compressed sensing (CS) method samples far below the Nyquist frequency, so it can greatly improve the imaging speed, and has attracted extensive attention from researchers in recent years. [0003] At present, MRI methods based on compressed sensing are mainly divided into two categories according to the coordinate system of the sampling trajectory: methods based on Cartesian coordinate system (such as k-t SPARSE-SENSE method, PS-Sparse method) and methods based on non-Cartesian coordinat...

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Problems solved by technology

However, the disadvantage of MRI is that the imaging speed is slow, and the compressed sensing (CS) method samples far below the Nyquist frequency, so it can greatly improve the imaging speed, and has received extensive attention from researchers in recent years.

[0003] At present, MRI methods based on compressed sensing are mainly divided into two categories according to the coordinate system of the sampling trajectory: methods based on Cartesian coordinate system (such as k-t SPARSE-SENSE method, PS-Sparse method) and methods based on non-Cartesian coordinate system The method based on the Cartesian coordinate system (such as the iGRASP method), and the method based on the Cartesian coordinate system is susceptible to motion artifacts due to the time difference between the acquisition of the data in the central area of ​​K-space and the data in the outer periphery of K-space. Although the method of the coordinate system is not sensitive to motion, the streak artifacts in the image are difficult to eliminate. It can be seen that the imaging quality of the magnetic resonance imaging method based on compressed sensing in related technologies is not high

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