Equal voxel magnetic resonance diffusion imaging method and equal voxel magnetic resonance diffusion imaging device based on multi-plate simultaneous excitation

Abstract

The invention discloses an equal voxel magnetic resonance diffusion imaging method and an equal voxel magnetic resonance diffusion imaging device based on multi-plate simultaneous excitation, whereinthe method comprises the following steps: S1, performing excitation for a tested target for many times through multi-plate simultaneous excitation pulse, and in a process of excitation each time, performing signal acquisition for the tested target through a multi-channel coil, and thereby obtaining k space data acquired through down sampling in excitation each time; S2, by a multi-excitation diffusion imaging reconstruction algorithm uniting the k space and an image domain, recovering k space position data which is not sampled in excitation each time; S3, correcting edge artifacts through an improved NPEN algorithm, thereby obtaining an imaged image. The method can obtain high-resolution images and also can keep relatively high signal-to-noise ratio at the same time, can reduce interference of three-dimensional navigation echo errors and improve quality and stability of reconstructed images, and can improve signal-to-noise ratio efficiency and scanning efficiency on the basis of guaranteeing the quality of the images.

Description

technical field [0001] The present invention relates to the technical field of magnetic resonance diffusion imaging, in particular to an equal-voxel magnetic resonance diffusion imaging method and device based on simultaneous excitation of multiple plates. Background technique [0002] Magnetic resonance diffusion imaging technology is currently the only imaging method for measuring the diffusion movement of water molecules in vivo. It senses the microscopic movement of water molecules by applying a diffusion gradient to detect the microstructure of tissues, which can obtain both structural information and functional information. Therefore, The technology has developed rapidly over the past two decades and has gradually become an important routine clinical examination and scientific research tool. The current conventional MRI diffusion imaging technique in neuroscience and clinical diagnosis is single-shot EPI (echoplanar imaging, echo planar imaging). Single-shot EPI compl...

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Problems solved by technology

However, ultra-high-field MRI scanners also have some limitations of their own: B 0 / B 1 The magnetic field is more inhomogeneous, T 2 / T 2 * The decay time constant becomes shorter, the energy deposition effect increases, etc.

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