A Multi-Echo Sampling Method Based on Three-dimensional Non-Cartesian Trajectory
A non-Cartesian, multi-echo technology, applied in the use of magnetic variable measurement, instruments, applications, etc., can solve the problems of low filling rate of Cartesian trajectory, low data acquisition efficiency, long imaging time of quantitative magnetic susceptibility, etc., to achieve improvement The effect of data sampling efficiency, improving acquisition efficiency, and reducing the number of pulse excitations
Active Publication Date: 2022-03-25
SHANGHAI JIAOTONG UNIV
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However, the low filling rate of Cartesian trajectories in k-space results in less efficient data acquisition and makes quantitative susceptibility imaging longer
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[0029] The following describes the embodiments of the present invention with reference to the accompanying drawings to make the technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned herein. In this application, k-space is a cylindrical space. The z direction in the cylindrical k-space is the direction of the central axis, which is also called the kz direction or the layer selection coding direction.
[0030] The application provides a multi-echo sampling method based on a three-dimensional non-Cartesian trajectory, which is used in quantitative magnetic susceptibility imaging technology, specifically including:
[0031] Step 1. Select a cylindrical k-space, and define the size of the k-space according to the quantitative magnetic susceptibility imaging scanning requirements. The parameters Nx, Ny, Nz are def...
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The present invention provides a multi-echo sampling method based on a three-dimensional non-Cartesian trajectory, which is used for quantitative magnetic susceptibility imaging technology, specifically comprising: selecting a cylindrical k-space, selecting multiple acquisition planes in the cylindrical k-space, And encode the multiple acquisition planes; on each of the multiple acquisition planes, select a data acquisition curve; determine according to the encoding of the multiple acquisition planes and each of the acquisition curves A three-dimensional non-Cartesian trajectory; designing a scanning time sequence according to the three-dimensional non-Cartesian trajectory; and implementing resonance data acquisition according to the scanning time sequence. The invention increases the filling rate of the k-space through the three-dimensional non-Cartesian trajectory, improves the data collection efficiency, and shortens the quantitative magnetic susceptibility imaging time.
Description
technical field [0001] The invention belongs to the technical field of quantitative magnetic susceptibility imaging, in particular to a multi-echo sampling method based on a three-dimensional non-Cartesian trajectory. Background technique [0002] Quantitative susceptibility mapping (QSM) is a three-dimensional quantitative visualization technique used in magnetic resonance imaging for the magnetization properties of biological tissues. Magnetic susceptibility is an inherent physical property of matter, which reflects the ability of matter to be magnetized in an external magnetic field. When the magnetic susceptibility source is placed in an external magnetic field, it will cause local magnetic field changes, resulting in different phase progressions of the magnetic resonance signals in multiple echoes. Quantitative magnetic susceptibility imaging technology analyzes the image phase and uses the algorithm of inverse problem solving to quantitatively measure the magnetic sus...
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IPC IPC(8): G01R33/48A61B5/055
CPCG01R33/4822A61B5/055
Inventor 杜一平李硕魏红江
Owner SHANGHAI JIAOTONG UNIV