Cylindrical k-space collecting method and system for three-dimensional dynamic magnetic resonance imaging

Abstract

The application raises a cylindrical k-space collecting method and system for three-dimensional dynamic magnetic resonance imaging. The method comprises the steps of establishing a cylindrical k-space collecting model, determining the collecting track of the echo signal in said k-space collecting model, wherein the collecting track is to conduct echo collection in radial direction passing through the circle center in any plane parallel to the undersurface of said cylinder, conduct Descartes distributed collection upwardly on the cylinder axis, and the radial azimuth and the axial position of the echo signal are calculated according to the two-dimensional golden section proportion; designing the scanning time series according to said collecting tracking, and calculating the encoding gradient of magnetic field to be applied required by the magnetic resonance imaging system; setting up the magnetic resonance imaging system according to aforesaid scanning time series, and collecting corresponding k-space data according to aforesaid collecting track. The method can realize the homogeneous and consecutive collection of three-dimensional k-space data, so as to obtain three-dimensional dynamic magnetic resonance imaging in high time resolution.

Description

technical field [0001] The present application relates to the technical field of three-dimensional dynamic magnetic resonance imaging, and in particular, to a cylindrical k-space acquisition method and system for three-dimensional dynamic magnetic resonance imaging. Background technique [0002] Magnetic Resonance Imaging (MRI) is to use nuclear magnetic resonance phenomenon to excite spin nuclei in the human body, and then receive the electromagnetic signals released by the spin nuclei to reconstruct the image information of human tissue, with no radiation, multi-contrast imaging and soft tissue. The advantages of high contrast ratio have become an important tool for clinical medical examination. The data collected in the magnetic resonance imaging process is called k-space data, and all the data form a k-space as a whole. Dynamic magnetic resonance imaging is a technology that uses magnetic resonance imaging to track the dynamic physiological processes of human tissues an...

AI Technical Summary

Problems solved by technology

For these two types of methods, the reconstruction of a set of 3D dynamic images requires repeated collection of all or a large amount of 3D k-space data, so the time resolution is low, and the k-space data within a specific time window needs to be selected for image reconstruction. The acquisition of the next time window is carried out in the next time window to ensure that the magnetic resonance data in the k-space are evenly distributed, so the freedom of image reconstruction is limited

In addition, there is a Cartesian and radial hybrid acquisition method, which uses radial acquisition in the plane and Cartesian acquisition in the gradient direction of layer selection. Although the acquisition time can be reduced to a certain extent by under-sampling acquisition, the k-space data is uniform Sexuality is still limited by the direction of slice encoding, and the temporal resolution of dynamic imaging is low

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