Magnetic resonance water-fat separation and quantitation method and magnetic resonance water-fat separation and quantitation apparatus based on echo planar imaging

Abstract

The invention discloses a magnetic resonance water-fat separation and quantitation method and a magnetic resonance water-fat separation and quantitation apparatus based on echo planar imaging. The method comprises: carrying out data collecting by using an echo planar imaging sequence encoded by a deformation-free point spread function to obtain multi-channel downsampling K-space data, recovering to obtain complete three dimensional k-space data, carrying out three dimensional inverse Fourier transform, and obtaining a three dimensional amplitude image through channel combination; extracting aplurality of two-dimensional k-space data from the three dimensional k-space data, obtaining a plurality of images through two-dimensional inverse Fourier transform, and calculating a corresponding echo offset time; carrying out water-fat separation and quantitation calculation by using the plurality of the images and the echo offset time to obtain a water signal and the ratios of the fat signalsat each frequency peak; and carrying out weighted square sum calculation on the three dimensional amplitude image in a phase encoding direction to obtain a deformation-free water phase and each fat phase. The method of the present invention has characteristics of strong applicability, high collection efficiency, no deformation, no T2* blur effect, high signal-to-noise ratio, simpleness and easy achieving.

Description

technical field [0001] The invention relates to the field of imaging technology, in particular to a magnetic resonance water-fat separation and quantification method and device based on echo-planar imaging. Background technique [0002] In related technologies, the relatively bright fat signal in magnetic resonance imaging will affect the observation of tissue structure and the calculation of some important indicators, such as ADC (Apparent diffusion coefficient, apparent diffusion coefficient), etc.; at the same time, the fat content itself can also be used as a clinical indicator. Therefore, the separation or quantification of fat signals has very important clinical applications. In order to eliminate the influence of fat signals, fat suppression techniques have been widely used. The commonly used fat suppression techniques in clinic include SPIR (spectral pre-saturation by inversion recovery, selective partial inversion recovery), SPAIR (spectral attenuated inversion reco...

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Problems solved by technology

In order to eliminate the influence of fat signals, fat suppression techniques have been widely used. The commonly used fat suppression techniques in clinic include SPIR (spectral pre-saturation by inversion recovery, selective partial inversion recovery), SPAIR (spectral attenuated inversion recovery, spectral Attenuation inversion recovery), STIR (short TIinversion recovery, short TI inversion recovery), in some cases, these methods, especially in areas with severe field inhomogeneity, such as the head and neck area, frontal lobe, etc., may not be able to completely Suppression of fat signals, especially STIR can also cause low signal-to-noise ratio

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