Diffusion magnetic resonance imaging and reconstruction method

Abstract

The invention discloses a diffusion magnetic resonance imaging and reconstruction method. The method includes the steps of S1, using multiple channel coils and adopting a multi-excitation diffusion imaging mode to carry out signal acquisition on tested targets to obtain k spatial data; S2, calculating a coil sensitivity figure and carrying out iterative initialization; S3, conducting iterative reconstruction on needed diffusion images on the basis of the POCS algorithm according to the collected k spatial data, the coil sensitivity figure obtained through calculation and initialization parameters. According to the method, not only is acquisition efficiency of signals improved, but also fuzzy artifacts and motion artifacts of the images are reduced, and image resolution is improved.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a diffusion magnetic resonance imaging and reconstruction method. Background technique [0002] Diffusion imaging technology in magnetic resonance imaging is currently the only imaging method for measuring the diffusion movement of water molecules in vivo. In MRI diffusion imaging, the microstructure of tissues can be detected by applying diffusion gradients along multiple directions to perceive the microscopic motion of water molecules, which can obtain both structural information and functional information. Therefore, the technology has developed rapidly in the past decade and has gradually become an important routine clinical examination and scientific research tool. Due to technical limitations, the diffusion imaging method currently used in clinical practice usually adopts a single-shot echo planar imaging (EPI) sequence. The single-shot EPI imaging is ch...

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Problems solved by technology

However, the algorithm requires that the number of excitations (equivalent to the SENSE acceleration multiple) is relatively small relative to the number of array coils, otherwise it will be affected by the g-factor of parallel imaging, which will lead to a decrease in the image signal-to-noise ratio, so the number of excitations is limited

In turn, this results in longer acquisition times per shot, resulting in blurred images and compromised resolution

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