Parallel magnetic resonance imaging algorithm based on conjugation and interlayer information

Abstract

The invention discloses a parallel magnetic resonance imaging algorithm based on conjugation and interlayer information. The algorithm comprises the steps of carrying out the R-time undersampling of agradient positive high-frequency part and a gradient negative high-frequency part of an imaging object, taking a middle low-frequency part as a calibration region, carrying out full sampling, and obtaining a matrix F; constructing a prediction matrix A of the undersampled data; constructing a weight calculation matrix B by utilizing the calibration areas of the matrix F of the current layer and the adjacent layer; constructing a column vector matrix C of the weight calculation matrix B; obtaining the column vector matrix C according to the product of the weight calculation matrix B and a weight matrix W, and fitting by adopting a least square method to obtain the weight matrix W in an interpolation window; constructing a prediction matrix D of the undersampled row data; obtaining a columnvector E according to the product of the prediction matrix D and the weight matrix W in the interpolation window; and filling to obtain a reconstruction matrix H, and carrying out Fourier transform to obtain an image of parallel magnetic resonance imaging. The method has the advantages of being high in imaging speed, rich in prediction source matrix information amount, high in signal-to-noise ratio and the like.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a parallel magnetic resonance imaging algorithm based on conjugate and interlayer information. Background technique [0002] Parallel magnetic resonance imaging (parallel MRI, p-MRI) is a major technological breakthrough in the field of high-speed imaging and image reconstruction of medical images, and has been applied to major magnetic resonance equipment. The parallel magnetic resonance imaging process is to collect the magnetic resonance K-space signal by the multi-channel phased array coil. Since each channel of the phased array coil contains the information of the adjacent channel, we can estimate the downsampling part through the information of the adjacent coil. Information, by reducing the number of phase encodings, the speed of magnetic resonance scans is increased. [0003] At present, image reconstruction algorithms in the prior art are mainly divid...

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Problems solved by technology

[0008] In the Chinese invention patent with the patent application number "2020111409917.9" ​​and the title "An Improved Algorithm for Parallel Magnetic Resonance Imaging", although parallel magnetic resonance imaging can be achieved at 3 times or less, the imaging reconstruction quality is high, but at more than 3 times In the case of accelerated acceleration, there is too much vacant information. At this time, if only the conjugate information in the layer is still used to add to the interpolation window, although the imaging effect can be significantly improved, there is still the problem of too little information, and the signal-to-noise ratio is not enough, so it cannot Achieve ideal image quality

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