Radial acquisition based double-nuclide synchronous magnetic resonance imaging method

Abstract

The invention discloses a radial acquisition based double-nuclide synchronous magnetic resonance imaging method. The method comprises the following specific steps of setting an examination area, a sampling spectrum width, a sampling point number and a radial sampling number; according to the Nyquist sampling law and a magnetogyric ratio of nuclide 1 to nuclide 2, calculating applied readout gradient intensities Grlevel 1 and Grlevel 2; according to a radial filling mode for planning three-dimensional k space, applying four gradient pulses to each gradient channel in sequence, and setting the gradient intensity and the gradient pulse width of each gradient channel; and setting parameters of an f1 channel and an f2 channel, wherein the f1 channel is a radio frequency channel corresponding to the nuclide 1, and the f2 channel is a radio frequency channel corresponding to the nuclide 2. According to the method, the resolutions of reconstructed images of the two nuclides in three space directions are consistent, accurate registration of the images of the two nuclides can be realized, and the problems that in conventional imaging, the imaging time of different nuclides is not synchronous, and the resolution difference is relatively large are solved.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a dual-nuclear synchronous magnetic resonance imaging method for radial acquisition. Background technique [0002] Magnetic resonance imaging (MRI) is widely used in scientific research and clinical medicine. In conventional applications, hydrogen ( 1 H) Nucleus is an imaging nuclide, which is rich in water in organisms, so it is also called water imaging. For the observation of life activities and the development process of tumors, MRI molecular imaging can reveal events at the molecular level, thereby facilitating early detection of diseases and early observation of therapeutic efficacy. In the field of molecular imaging, fluorine ( 19 F), carbon ( 13 C), sodium ( 23 Na), phosphorus ( 31 P), oxygen ( 17 Nuclides such as O) have become the research hotspots of magnetic resonance imaging. However, these nuclides are low in concentration in organisms (end...

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Problems solved by technology

[0007] In the process of magnetic resonance imaging, the applied gradient field acts on the spatial region, that is, it acts on two nuclides at the same time, and the magnetic rotation ratio γ of different nuclides differs greatly. It is easy to know from formula (1) that for different nuclides, If the SW is kept unchanged, the FOV corresponding to the collected signal is different, resulting in different image sizes and resolutions, which is not conducive to the registration and comparison of different nuclide images

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