Magnetic resonance imaging method and magnetic resonance imaging equipment

Abstract

An embodiment of the invention discloses a magnetic resonance imaging method and a magnetic resonance imaging device. The method comprises the following steps: exciting a target area of a subject by utilizing a first group of radio-frequency pulses to enable a longitudinal magnetic vector of a specific type of nuclear spin in the target area to be in a set value; for at least one or more slice layers in the target area, exciting the target area of the subject by utilizing a second group of radio-frequency pulses to suppress signals of the specific type of nuclear spin; exciting the target area of the subject by utilizing an imaging pulse sequence and obtaining magnetic resonance signals corresponding to the target area; and reconstructing the magnetic resonance signals, and obtaining a magnetic resonance image of the target area. The magnetic resonance imaging method and the magnetic resonance imaging device can reduce the phenomenon of interlayer jump of signal intensity of special tissues.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of magnetic resonance imaging, and in particular, to a magnetic resonance imaging method and a magnetic resonance imaging device. Background technique [0002] The principle of Magnetic Resonance Imaging (MRI) is: by applying a gradient magnetic field and RF waves to a target object in a static magnetic field, and giving a magnetic resonance (Magnetic Resonance , MR) signals to reconstruct the structural image corresponding to the target inspection object. The application of this technology in clinical diagnosis and scientific research has become a reality, which has greatly promoted the rapid development of medicine, neurophysiology and cognitive neuroscience. [0003] In magnetic resonance imaging, because the nuclear spin signal of some special tissues (such as adipose tissue) is too strong, it may cover up the lesion. Taking adipose tissue as an example, in order to suppress the nu...

AI Technical Summary

Problems solved by technology

[0003] In magnetic resonance imaging, because the nuclear spin signal of some special tissues (such as adipose tissue) is too strong, it may cover up the lesion. Taking adipose tissue as an example, in order to suppress the nuclear spin signal of adipose tissue, usually magnetic The resonance imaging sequence and the magnetic resonance frequency selective fat suppression sequence are used together to suppress the fat signal, and the irregularity of the frequency sequence of the magnetic resonance frequency selective fat suppression sequence leads to a jump in the fat suppression effect between layers, that is, different layers of fat suppression The degree is inconsistent. Doctors often feel that the jump between layers is particularly eye-catching when reading the film. In severe cases, it will affect the diagnosis.

[0004] The reason for the layer-to-layer jump of fat signal intensity is that for the clinical application of respiratory bandage or navigation trigger, the irregular sequence timing makes the fat longitudinal magnetization vector have not yet reached a stable level when fat suppression is performed on the first few slices scanned. state, and the RF pulse flip angle of the fat-pressing module on each layer is the same, so the fat longitudinal magnetization vector after the fat-pressing module is different for each layer, which eventually leads to inter-layer jumps in the fat signal intensity on the image

Images