Water and fat separation imaging method and device in magnetic resonance imaging

Abstract

The invention discloses a water and fat separation imaging method in magnetic resonance imaging. A fast spin echo sequence based on a two-point Dixon method is adopted, wherein each refocusing radio-frequency pulse corresponds to two read-out gradients having the same polarity and a rephasing gradient having the opposite polarity, the two read-out gradients corresponding to each refocusing radio-frequency pulse are respectively divided into a front portion and a rear portion through the echo center of each of the two read gradients, the area of the rear portion of the front read gradient is less than that of the front portion of the front read gradient, and the area of the front portion of the rear read gradient is less than that of the rear portion of the rear read gradient. The method comprises operating the fast spin echo sequence; conducting fast Fourier transform (FFT) on each collected echo signal, rebuilding and obtaining water and fat in-phase images and water and fat antiphase images; conducting Fourier transform on the data executing portion of each echo signal; carrying out the water and fat separation algorithm on the water and fat in-phase images and the water and fat antiphase images to obtain pure water images and pure fat images. The invention further provides a corresponding device which can resolve the problem of image artifacts.

Description

technical field [0001] The present invention relates to the technical field of magnetic resonance imaging (Magnetic Resonance Imaging, MRI), in particular to a water-fat separation imaging method and device in magnetic resonance imaging, and also relates to a machine-readable storage medium and a computer program. Background technique [0002] In Magnetic resonance imaging (MRI), due to the different molecular environments of the hydrogen protons in human body fat tissue and hydrogen protons in other tissues, their resonance frequencies are different; when fat and other tissues When hydrogen protons are simultaneously excited by radio frequency pulses, their relaxation times are also different. The signals were collected at different echo times, and adipose tissue and non-adipose tissue showed different phases and signal intensities. [0003] The Dixon method is a method used to generate pure water proton images in magnetic resonance imaging. The signals are calculated to ...

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Problems solved by technology

[0014] It can be seen that the imaging effect of the water-fat separation imaging technology based on the two-point Dixon method in the prior art is not ideal, and the problems of eddy current and accompanying field caused by the high-amplitude condensing gradient need to be solved urgently to improve the magnetic resonance Artifact Problems in Imaging

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