Magnetic resonance T2 * weighted rapid imaging method and device

Abstract

The invention provides a magnetic resonance T2 * weighted rapid imaging method and device which relate to the magnetic resonance imaging technology field wherein the method comprises: according to single-band radio frequency pulses, generating multi-band radio frequency pulses; according to the fast parallel imaging technique based on controllable mixing and superposing, modulating the initial phases of the multi-band radio frequency pulses in different repetition times to generate the modulated multi-band radio frequency pulses; through the layer separation scanning and echo migration technique, generating the T2 * weighted imaging sequence based on multi-layer co-excitation technique and the layer separation scanning and echo migration technique; obtaining the multi-layer mixed and superposed images of a to-be-processed object; and using the reconstruction algorithm to reconstruct and process the multi-layer mixed and superposed images to determine the single layer T2 * weighted images. The method and apparatus of the invention can further accelerate the layer separation scanning and echo migration technique through the multi-layer co-excitation technique to realize faster T2 * weighted imaging to ensure the signal-to-noise ratio and reduce the influence of the artifacts and distortions on the image quality. The use of small flip angled radio frequency pulses effectively reduces the specific absorption rate.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a magnetic resonance T2* weighted fast imaging method and device. Background technique [0002] Currently, magnetic resonance T2* weighted imaging is widely used in the field of magnetic resonance imaging, such as functional magnetic resonance imaging (fMRI for short) and susceptibility weighted imaging (SWI for short). Magnetic resonance T2* weighted images can only be acquired by gradient echo sequence (GRE for short), and require a long echo time (echotime, TE), which makes the traditional gradient echo sequence in T2* weighted Imaging requires a long scan time, which reduces the time resolution of T2* weighted imaging and limits its application in many fields. Currently, T2 based on simultaneous multiple-slices excitation (SMS), echo-shifting (ES) and echo-planar imaging (EPI) The *weighted imaging method greatly reduces the scan time of T2*-weighted imag...

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a magnetic resonance T2* weighted fast imaging method and device to solve the current lack of a method that can not only ensure the signal-to-noise ratio, but also greatly reduce the impact of artifacts and distortion on image quality, and Problems with effective reduction of specific absorption rate in magnetic resonance T2* weighted fast imaging method

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