Water and fat separation imaging method and water and fat separation imaging system

Abstract

The invention discloses a water and fat separation imaging method and a water and fat separation imaging system. The water and fat separation imaging method comprises the following steps of setting a plurality of echo times by using a time reversal steady procession quick imaging sequence; acting on an imaging area in a main magnetic field by using periodical radio frequency pulses so that magnetic resonance signals are generated in the imaging area; acquiring the magnetic resonance signals corresponding to the echo times; performing magnetic resonance image reconstruction according to the magnetic resonance signals corresponding to the echo times to obtain corresponding magnetic resonance images; and performing calculation according to the magnetic resonance images corresponding to the echo times to obtain a water image and a fat image which are separated from each other. By the technical scheme, the signals can be acquired quickly, imaging can be carried out quickly, and the water image and the fat image which are separated from each other are obtained.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to an abdominal water-fat separation imaging method and system. Background technique [0002] Magnetic resonance abdominal hydrolipid separation imaging is of great significance in abdominal imaging. Water-fat separation imaging can better display the lesion and normal tissue structure, and avoid the interference of fat signal on subsequent diagnosis. In the diagnosis of fatty liver disease, etc., water-fat separation imaging can also quantitatively separate water images and fat images, and perform quantitative evaluation of tissue fat content. In addition, water-fat separation imaging can improve image quality and remove fat-induced artifacts. [0003] In the existing T2-weighted water-fat separation imaging (T2WI, T2-weighted imaging, transverse relaxation time-weighted imaging), fat saturation imaging technology and magnetic resonance spectroscopy imaging tec...

AI Technical Summary

Problems solved by technology

Fat saturation imaging technology uses saturation pulses to selectively excite protons in fat, and then applies imaging pulses. The protons in fat are saturated and no longer contribute signals during imaging. The disadvantage of fat saturation imaging technology is that it requires a higher uniformity of the magnetic field. However, the human abdomen is large, it is difficult to ensure the uniformity of the magnetic field, and the introduction of fat saturation pulses increases the selective absorption rate, which limits the imaging speed, and fat saturation imaging technology suppresses fat signals and cannot obtain separated fat images

Magnetic resonance spectroscopy imaging technology is mainly based on the difference in resonance frequency between water and fat, and the signal intensity of each frequency band is obtained through magnetic resonance spectroscopy technology. The disadvantage is that the scanning time is long, which is not conducive to rapid imaging.

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