Movement probing gradient impulse wave design method and device for magnetic resonance

Abstract

The invention discloses a movement probing gradient impulse wave design method and device for magnetic resonance. The method includes the steps that the value b and duration of a movement probing gradient pulse are set; the waveform of the movement probing gradient pulse is determined according to the set value b and the duration, so that the average amplitude of the movement probing gradient pulse corresponding to the waveform within half of the duration close to a gathering pulse corresponding to the movement probing gradient pulse is smaller than the average amplitude of the movement probing gradient pulse corresponding to the waveform within the other half of the duration away from the gathering pulse corresponding to the movement probing gradient pulse. According to the technical scheme, the value b of the MPG pulse is the same with a value of an MPG pulse in the prior art, and needed current intensity is smaller than current intensity needed by the MPG value in the prior art.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to the technical field of magnetic resonance gradient pulses. Background technique [0002] Among the various imaging techniques of magnetic resonance, diffusion weighted imaging (Diffusion Weighted Imaging, DWI) is a newly developed one. A method that allows the non-invasive examination of the tissue structure and functional state of an organism at the molecular level. [0003] When performing diffusion-weighted imaging, it is necessary to apply a diffusion gradient (diffusion gradient) pulse sequence on at least one of the slice selection gradient, phase encoding gradient, and readout gradient, also called motion probing gradient (Motion Probing Gradient, MPG) pulse train. [0004] In the prior art, the b value (b-factor) is generally used to reflect the influence of the MPG pulse, γ is a constant, TE is an echo time, and G(t) is a function representing the waveform ...

AI Technical Summary

Problems solved by technology

And, the teaching about MPG pulse design in the prior art all only pays close attention to how the waveform design of MPG pulse is as close as possible to rectangle

[0010] Although such an MPG pulse can generate a large b value, it requires a lot of power

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