Water-fat separation method and system based on inversion recovery real image reconstruction

Abstract

The invention belongs to the field of magnetic resonance imaging, and particularly relates to a water-fat separation method and system based on inversion recovery real image reconstruction. The methodincludes the steps that firstly, a first inversion recovery moment and a second inversion recovery moment are determined, so that the signal intensity directions of fat and water in images acquired at the two moments are not completely the same; at the first inversion recovery moment and the second inversion recovery moment, a scanning sequence is used respectively for stimulating a detected body, and two images containing a pure water image and a pure fat image at the same time are obtained; then fat signal intensity data and water image signal intensity data in the image are obtained by calculation; and finally, a fat image and a water image are obtained through real image reconstruction by utilizing the calculated fat signal intensity data and water image signal intensity data in the image. According to the method, an inversion recovery real image is used for reconstruction, the mode image and the phase image of a magnetic resonance image signal are used for reconstruction at the same time, the longitudinal magnetization vector of tissue is valued between negative maximum and positive maximum, and the contrast ratio between the tissues is enhanced.

Description

technical field [0001] The invention belongs to the field of magnetic resonance imaging, and more specifically relates to a water-fat separation method and system based on inversion recovery real image reconstruction. Background technique [0002] Magnetic resonance imaging is a technique that uses radio frequency pulses to resonate with hydrogen protons in tissues for imaging. The hydrogen protons that exist widely in the human body mainly come from water and fat tissue. When they are placed in a static magnetic field, the spin direction of the hydrogen protons will change. One is to follow the direction of the magnetic field, which is called a low energy level; Against the direction of the magnetic field, it is called a high energy level. And the number of hydrogen protons in the low energy level is more than the number of protons in the high energy level, the difference is called the net magnetization vector. Excite the hydrogen protons in the magnetic field with a radi...

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Problems solved by technology

[0008] Aiming at the defects or improvement needs of the prior art, the present invention provides a water-fat separation method and system based on inversion recovery real image reconstruction, based on the moment when the longitudinal magnetization component of hydrogen nuclei in the fat of the subject is 0 and the water At the moment when the longitudinal magnetization component of the hydrogen nucleus is 0, select two suitable inversion recovery moments, so that the signal intensity directions of fat and water in the images collected at the two selected inversion recovery moments are not completely the same. The signal strength of the negative sign is calculated, and the signal strength data of the fat image and the water image are respectively obtained, and the image reconstruction is carried out by using the image signal model image and the phase image at the same time. Reconstruction separation aims to solve the technical problems of low contrast and black edge artifacts in the water-fat image obtained by the existing water-fat separation method based on inversion recovery technology

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