Acquisition method and device of magnetic resonance quantitative information graphs

Abstract

According to the embodiment, the invention discloses an acquisition method and an acquisition device of magnetic resonance quantitative information graphs. The method comprises the following steps: onthe basis of two groups of echos which are acquired within two different repetition times during running of a three-dimensional gradient multi-echo sequence, constructing a plurality of linear equations that unknowns are T1, Formula (shown as the Description) and / or proton density, and guaranteeing that the number of the constructed linear equations is no less than the number of unknowns in the linear equations; and through a mode of solving solutions of the linear equations, acquiring a T1 quantitative graph, a quantitative graph of the Formula and a proton density quantitative graph. Therefore, according to the acquisition method of the magnetic resonance quantitative information graphs provided by the embodiment, a process of acquiring the quantitative information graphs into a processof solving a linear equation group, and the acquisition method has the characteristic that three quantitative information graphs can be simultaneously acquired through one-time data acquisition. Eachquantitative information graph can be acquired just by conducting one-time acquisition on a patient instead of scanning the patient for several times, so that a great amount of data acquisition timeis saved and a data acquisition rate is improved.

Description

technical field [0001] The present application relates to the technical field of magnetic resonance imaging, in particular to a method and device for obtaining a magnetic resonance quantitative information map. Background technique [0002] The basic principle of Magnetic Resonance Imaging (MRI) is: hydrogen nuclei (hydrogen atoms) in human tissue have spin motion to generate magnetic moments. Under the action of a strong and uniform main magnetic field, the spin magnetic moments of the spin hydrogen protons that are not regularly arranged will be arranged along the direction of the main magnetic field to form a macroscopic magnetic moment. Under the excitation of radio frequency pulses, the macroscopic magnetization vector will be flipped to the direction perpendicular to the main magnetic field, and can be received by the radio frequency receiving system during the process of precession and rotation, thereby generating electromagnetic induction signals, and various magneti...

AI Technical Summary

Problems solved by technology

One of the disadvantages of these technologies is that only a single quantitative information graph can be obtained each time, and multiple quantitative information graphs cannot be comprehensively used for accurate diagnosis; the second disadvantage is that the acquisition time is too long, sometimes as long as half an hour. The patient's tolerance is a big test; especially when multiple quantitative information maps need to be obtained, multiple sequences need to be collected separately, and the required acquisition time is the sum of the individual acquisition times of each quantitative information map

In addition, the data collection time is too long, and the patient may have involuntary movement during the data collection process, which will seriously affect the registration between the quantitative information maps, and bring troubles to quantitative analysis and diagnosis

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