Speed selection radiofrequency pulse-based magnetic resonance black blood imaging method and system

Abstract

The invention discloses a speed selection radiofrequency pulse-based magnetic resonance black blood imaging method, comprising the following steps of designing a speed selection radiofrequency pulse; according to the speed selection radiofrequency pulse, coding a blood flow speed to inhibit a blood flow magnetic resonance signal in a preset speed range; performing black blood imaging after the blood flow magnetic resonance signal is inhibited. According to the black blood imaging method provided by the embodiment of the invention, the blood flow speed is coded by designing the speed selection radiofrequency pulse and according to the speed selection radiofrequency pulse, so the blood flow magnetic resonance signal in the specific speed range is inhibited, the black blood imaging is realized, the blood flow magnetic resonance signal is effectively inhibited, the imaging quality is improved, and the magnetic resonance signal of a static tissue is prevented from being influenced by the blood flow inhibition radiofrequency pulse. The invention also discloses a speed selection radiofrequency pulse-based magnetic resonance black blood imaging system.

Description

technical field [0001] The invention relates to the field of medical technology, in particular to a magnetic resonance black blood imaging method and system based on speed-selective radio frequency pulses. Background technique [0002] Magnetic resonance black blood imaging refers to the acquisition of information about the static tissue (vascular wall) around the blood by suppressing the signal of the blood flowing in the blood vessel. Magnetic resonance black blood imaging can provide multi-contrast images of static tissues, and can simultaneously observe the information of the vessel lumen and vessel wall. The core problem of magnetic resonance black blood imaging is how to effectively suppress the signal of flowing blood, so as to accurately identify the vessel lumen-wall junction and evaluate the morphology and composition of atherosclerotic plaques. [0003] The uncertainty of blood flow velocity is the key to restricting the efficiency of blood flow suppression in bl...

AI Technical Summary

Problems solved by technology

Among them, inflow saturation, as a "natural" black blood imaging method, has the highest time efficiency, but the blood flow suppression efficiency is relatively low; double inversion recovery is currently the most used blood flow suppression method, and the blood flow suppression efficiency is high, but Due to the mechanism of inversion recovery, this method sacrifices time efficiency, and this method can only be used for 2D imaging, and its application is limited; motion-sensitive drive balance may introduce various errors in practical applications due to the long preparation time of the module , and due to phase accumulation, its inhibitory effect on uniform blood flow is not ideal

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