Magnetic resonance imaging method and magnetic resonance imaging system

Abstract

The invention discloses a magnetic resonance imaging method and a magnetic resonance imaging system. The method includes the following steps: a scanning portion is activated by utilizing a preset scanning sequence to obtain an echo signal combination of each of body layers of the scanning portion, wherein the preset scanning sequence includes a first scanning sequence and a second scanning sequence appearing in a preset combination, the first scanning sequence is a spin echo sequence, the second scanning sequence is a combination of an inversion recovery pulse and the spin echo sequence, and the inversion recovery pulse is used for selection of the body layers; first imaging data corresponding to an echo signal corresponding to the first scanning sequence, and second imaging data corresponding to the echo signal corresponding to the second scanning sequence are determined, and preset logical operation results of the first imaging data and the second imaging data are utilized as imagingdata; and a magnetic resonance image of the scanning portion is determined according to the imaging data. The problem that the signal-to-noise ratio of a region of interest of the scanning portion islow and minimum TE is large is solved in the prior art.

Description

technical field [0001] Embodiments of the present invention relate to medical device technology, and in particular, to a magnetic resonance imaging method and a magnetic resonance imaging system. Background technique [0002] In the pulse imaging sequence of Magnetic Resonance Imaging (MRI), there is a spectral sequence imaging, which is Magnetic Resonance Spectrum MRS (Magnetic Resonance Spectrum, MRS) imaging. MRS imaging uses the chemical shift difference of metabolites to obtain metabolite information , by analyzing metabolic activity to obtain changes in the level of relevant metabolites. Since the frequency difference between related metabolites increases with the increase of the B0 field, under the limited radio frequency pulse (Radio Frequency, referred to as RF) bandwidth, as the B0 field strength increases, the chemical shift error effect (error) increases, which leads to The excitation regions of different metabolites are biased, and the signal-to-noise ratio (SI...

AI Technical Summary

Problems solved by technology

Since the frequency difference between related metabolites increases with the increase of the B0 field, under the limited radio frequency pulse (Radio Frequency, referred to as RF) bandwidth, as the B0 field strength increases, the chemical shift error effect (error) increases, which leads to The excitation regions of different metabolites are deviated, and the signal-to-noise ratio (SIGNAL-NOISE RATIO, referred to as SNR) of the border region is low

[0003] For this reason, the existing technology often uses high-order broadband adiabatic excitation to solve the above problems, but this solution has the problems of polarization effect and B0 field inhomogeneity, and the adiabatic Pulses need to be used in pairs, resulting in an increase in the minimum echo time (TE)

Therefore, in clinical scenarios, due to the safety limit of electromagnetic wave absorption ratio (Specific Absorption Rate, referred to as SAR) and the constraints of factors such as radio frequency transmission power and gradient performance, the minimum TE (echo time, echo time) that can finally be achieved is still relatively large , unable to meet the needs of clinical diagnosis

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