Magnetic resonance imaging method and device based on chaotic sampling trajectory
A magnetic resonance imaging and trajectory generation technology, which is applied in 2D image generation, image enhancement, image analysis, etc., can solve the problems of difficult physical implementation and large storage capacity of measurement matrix
Inactive Publication Date: 2017-01-11
GUANGDONG UNIV OF TECH
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[0010] The purpose of the present invention is to provide a magnetic resonance imaging method and device based on chaotic sampling trajectory, to solve the problems of large storage capacity and difficult physical realization of the measurement matrix constructed by random matrix in the existing magnetic resonance imaging equipment
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[0046] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0047] The flow chart of a specific embodiment of the magnetic resonance imaging method based on chaotic sampling trajectory provided by the present invention is as follows: figure 1 As shown, the method includes:
[0048] Step S101: generating a chaotic trajectory;
[0049] Specifically, this step may be to generate a Rossler chaotic trajectory.
[0050]Step S102: intercepting a single chaotic trajectory C...
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The invention discloses a magnetic resonance imaging method and device based on a chaotic sampling trajectory. The method comprises the steps that a chaotic trajectory is generated; a single chaotic trajectory C is truncated from the chaotic trajectory, wherein the single chaotic trajectory C covers a k-space; according to the preset maximum gradient magnitude Gmax and the maximum gradient switch rate Smax which are allowed by magnetic resonance equipment, the truncated single chaotic trajectory is optimized to acquire the shortest traversing time; the excitation quantity is determined according to the speed-up ratio, and it is guaranteed that the single chaotic trajectory covers the target k-space; the single chaotic trajectory obtained after optimization rotates around an original point of the k-space to generate k-space data. According to the magnetic resonance imaging method and device based on the chaotic sampling trajectory, the original chaotic trajectory is truncated to enable the chaotic trajectory to meet the attenuation speed of signals, the traversing time of the trajectory is controlled within a millisecond range, the magnetic resonance sampling speed is increased, and practical application of the magnetic resonance equipment is facilitated.
Description
technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a method and device for magnetic resonance imaging based on a chaotic sampling trajectory. Background technique [0002] MRI (Magnetic Resonance Imaging, Magnetic Resonance Imaging) is an imaging diagnostic technology that has been put into clinical application in medical institutions since the 1980s. It provides clinicians with a clear study of human anatomy and tissue energy metabolism, and has become a very important imaging method in modern clinical medicine. [0003] Magnetic resonance imaging based on CS Compressed Sensing (Compressed Sensing) theory is currently a hot topic in fast magnetic resonance imaging, which breaks through the limit of Shannon sampling theorem that the sampling rate must be higher than twice the signal bandwidth. Since the application of compressed sensing needs to meet the three necessary conditions of signal sparsity, incoheren...
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IPC IPC(8): G06T11/00G06N3/04A61B5/055A61B5/00
CPCG06T11/006A61B5/0033A61B5/055G06N3/0418G06T2207/10088G06T2207/20056G06T2211/416
Inventor 李亚刘庆凌永权
Owner GUANGDONG UNIV OF TECH