Respiratory signal extraction method and device, magnetic resonance imaging system and storage medium

Abstract

The embodiment of the invention discloses a respiratory signal extraction method and device, a magnetic resonance imaging system and a storage medium. The method comprises the following steps of: acquiring a first set number of points of pure respiratory modulated pilot tone signals received by a plurality of channels; carrying out eigenvalue decomposition on the basis of a covariance matrix, anddetermining a respiratory feature direction; acquiring a second set number of points of interfered pilot tone signals which are received by a plurality of channels and generate signal mutation when asequence of pulses runs; carrying out eigenvalue decomposition on the basis of a covariance matrix to obtain an eigenvector matrix, and determining an interference feature direction; for each pilot tone signal received by the plurality of channels, respectively utilizing the feature vector matrix to carry out orthogonal transformation to obtain a plurality of signals; and performing projection addition on the signals in the other feature vector directions except the signals in the interference feature direction in the respiratory feature direction to obtain a respiratory navigation signal. Visibly, respiratory signals accurately representing respiratory movements can be reproduced.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a breathing signal extraction method and device, a magnetic resonance imaging system, and a computer-readable storage medium. Background technique [0002] Magnetic resonance imaging (MRI) is a technique that uses magnetic resonance phenomena for imaging. The principle of magnetic resonance imaging mainly includes: atomic nuclei containing a single number of protons, such as hydrogen nuclei widely present in the human body, the protons have spin motion, just like a small magnet, and the spin axes of these small magnets have no certain rules. External magnetic field, these small magnets will be rearranged according to the magnetic force lines of the external magnetic field, specifically in two directions parallel to or antiparallel to the magnetic force lines of the external magnetic field, and the above-mentioned direction parallel to the magnetic force lines o...

AI Technical Summary

Problems solved by technology

However, in some cases, when running the burst sequence, the received pilot tone signal can be severely distorted, such as Figure 1B As shown, it shows the distorted PT signal received by the 6 channels when the sequence pulse is triggered to run, that is, the interference PT signal

It can be seen that this distorted signal can no longer accurately represent respiratory motion and therefore cannot be considered as a respiratory navigator

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