MRI (Magnetic Resonance Imaging) method and device

Abstract

The invention discloses an MRI method. The method comprises the following steps that a target scanning part of a scanned object is located in a predetermined position, according to relation between the position of each coil unit in a local coil and the target scanning part, a coil unit is selected, a magnetic resonance signal is obtained, Fourier transform is carried out on the magnetic resonance signal, and a magnetic resonance image of the target scanning part is obtained. The position of each coil unit is obtained by the steps of obtaining the initial position of each coil unit in the local coil; obtaining a relative zero-point position of the local coil; and correcting the initial position of each coil unit according to the relative zero-point position. According to the invention, the position of the highest accuracy serves as the relative zero point, positions of other coil units is derived from the coil structure, and the total positioning accuracy and stability of the local coil are improved. At the same time, the invention also provides an MRI device.

Description

[0001] 【Technical field】 [0002] The present invention relates to the field of magnetic resonance technology, in particular to a method and device for magnetic resonance imaging. [0003] 【Background technique】 [0004] With the continuous improvement of medical level, magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is increasingly used in clinical diagnosis. The magnetic resonance device is composed of a magnet system, a gradient system, a radio frequency system, and a data acquisition and reconstruction system. The radio frequency system composed of multiple coils is an important part of the entire system. It usually functions to transmit radio frequency pulses and receive signals. In the workflow, access to the system is required to be recognized and function properly. When multiple coil units form a phased array local coil for imaging scanning, each coil unit corresponds to a specific effective imaging area, and selecting the coil unit combination that matche...

AI Technical Summary

Problems solved by technology

However, the center positions of the coil units identified by the above methods are independent of each other, and the positioning accuracy will be affected by many factors: on the one hand, it is easily affected by the tissue structure; The coil units are all located in the center of the magnet, and even some coil units are outside the effective imaging area. The sensitivity signals of the coil units far away from the center of the magnet are affected by the distortion of the magnetic field, resulting in deformation of the sensitivity curve signal, thereby reducing the accuracy of coil positioning

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