Magnetic resonance imaging method and system

Abstract

The invention discloses a magnetic resonance imaging method. The magnetic resonance imaging method comprises the following steps: correcting the frequency positions of a water signal peak and a fat signal peak according to the fat-water content ratio of a target detection part; inhibiting fat signals by adopting a frequency selection method according to the corrected frequency position of the fat signal peak, and setting the corrected frequency position of the water signal peak as the chemical saturation emission frequency; exciting a target scanning sequence by adopting the chemical saturation emission frequency, thus obtaining magnetic resonance data; and reconstructing the magnetic resonance data to obtain a magnetic resonance image. According to the magnetic resonance imaging method, the frequency positions of the water signal peak and the fat signal peak can be accurately located by combining with the fat-water content ratio, so that the occurrence of water pressure can be avoided. In addition, the invention further provides a magnetic resonance imaging system.

Description

[0001] 【Technical field】 [0002] The present invention relates to magnetic resonance imaging technology, in particular to chemical saturated fat suppression imaging technology. [0003] 【Background technique】 [0004] In magnetic resonance imaging, due to the different molecular environments of hydrogen protons in human body fat tissue and hydrogen protons in other tissues, their resonance frequencies are different; when hydrogen protons in fat and other tissues are excited by radio frequency pulses at the same time After that, their relaxation times are also different. Signals were collected at different echo times, and adipose tissue and non-adipose tissue showed different signal intensities. On the one hand, these properties of adipose tissue provide a good natural contrast for lesion detection, but on the other hand, these properties of adipose tissue may reduce the quality of MR images, thereby affecting the detection of lesions, specifically as follows: (1 ) Motion art...

AI Technical Summary

Problems solved by technology

In most tissues, fat peaks and water peaks are relatively easy to identify, but in some special human tissues, such as neck tissue, there is less fat content in this part, there is no obvious fat peak, and the anatomy of the neck The complexity and irregularity of the structure make the inhomogeneity of the magnetic field more obvious, and in the final spectrum space, there is often a phenomenon that the water signal is scattered on multiple obvious peaks

It is precisely because of the complexity of this individual that the traditional frequency correction method (such as the method based on the shape of the spectrum curve and the chemical shift of water and fat) has a large error, which leads to the phenomenon that the muscle tissue is suppressed in the magnetic resonance fat suppression image. caused a great disturbance to the final diagnosis

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