Tissue separation imaging method based on inversion recovery

Abstract

The invention provides a tissue separation imaging method based on inversion recovery, adopting scanning imaging sequence to excite an imaging object, and carrying out image sampling on the imaging object in different inversion times. Each sampling image comprises an image of each tissue, the time of sampling is determined by kind quantity of tissues to be separated and imaged are contained in theimaging object, and a pure tissue image of each tissue is obtained through simultaneous solution according to each sampling image data and proportion relation occupied by each tissue image data in each sampling image. The method is insensitive to the nonuniformity of a magnetic field, obtains the image with higher SNR through the separation imaging, can realize simultaneous separation imaging ofmultiple tissues, and is widely applied to various low, middle and high magnetic field MR imaging systems.

Description

technical field [0001] The invention relates to magnetic resonance imaging technology, in particular to a tissue separation imaging method based on inversion recovery (IR, Inversion Recovery) technology. Background technique [0002] Magnetic resonance imaging is a technique that uses the phenomenon of magnetic resonance to perform imaging. The principle of magnetic resonance phenomenon mainly includes: atomic nuclei containing a single number of protons, such as hydrogen nuclei widely present in the human body, the protons have spin motion, just like a small magnet, and the spin axes of these small magnets have no certain rules. External magnetic field, these small magnets will be rearranged according to the magnetic force lines of the external magnetic field, specifically in two directions parallel to or antiparallel to the magnetic force lines of the external magnetic field, and the above-mentioned direction parallel to the magnetic force lines of the external magnetic fi...

AI Technical Summary

Problems solved by technology

[0014] Although the inversion-recovery separation imaging method can ignore the influence of the inhomogeneity of the external magnetic field, and there will be no difficulty in narrow-band pulse design when using the frequency selection method, but when acquiring an image of one of the tissues in the imaging object, Only the echo signals sent by the hydrogen nuclei in this kind of tissue are used, so that the signal amplitude is greatly reduced, and due to the randomness of the noise, the significant reduction of the signal amplitude will reduce the signal-to-noise ratio of the image, thereby affecting the imaging quality

Moreover, this existing inversion recovery separation imaging method cannot calculate and obtain images of various tissues at the same time, nor can it separate images of more than two tissues in the same imaging object.

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