Single-scanning quantitative magnetic resonance T2 * imaging method based on residual network reconstruction

Abstract

A single-scanning quantitative magnetic resonance T2 * imaging method based on residual network reconstruction relates to a magnetic resonance imaging method. Four small-angle excitation pulses with the same deflection angle are utilized, a period of evolution time is formed after each excitation pulse, so that the transverse relaxation time of each echo signal is different. A shifting gradient ofa frequency dimension and a phase dimension is added after each excitation pulse, so that the signals generated by different excitation pulses are different in the position of the k space. In this way, a plurality of gradient echo signals with different transverse relaxation time are obtained in one-time sampling. The sampling signals are subjected to normalization, zero filling and fast fouriertransformation and then input to a trained residual network to be reconstructed to obtain a quantitative T2 * image. The training data of the residual network are derived from simulation data, and theinput image of a network is obtained via a random generation template through simulating the experiment environment for sampling. The template serves as a label, and a mapping relation between an input image and an output image is obtained through training.

Description

Technical field [0001] The invention relates to a magnetic resonance imaging method, in particular to a single-scan quantitative magnetic resonance imaging method based on a residual network reconstruction algorithm. 2 *Imaging method. Background technique [0002] Magnetic resonance parametric imaging (for example, T 1 Imaging, T 2 Imaging and T 2 * Imaging) can be easily used to provide quantitative information for characterizing specific tissue properties [1] . Quantitative imaging has many outstanding features, among which the most obvious advantage is that it can eliminate the influences that are independent of the nature of the tissue, such as dependence on the operator, differences in scanning parameters, spatial changes in magnetic fields and image scaling, etc. [2] . T 2 *Imaging, as a kind of MRI quantitative imaging, provides a contrast mechanism for analyzing normal and diseased living tissues in a non-invasive way. 2 *Relaxation measurement can get the iron content o...

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Problems solved by technology

However, it is difficult to separate the 4 overlapping echo signals by conventional methods

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