Improved algorithm for parallel magnetic resonance imaging

A technology of magnetic resonance imaging and improved algorithm, which is applied in the directions of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and magnetic variable measurement, etc., which can solve the problems of obvious noise curling artifacts, residues, and poor reconstruction effects, etc. Achieve the effects of sufficient information, improved imaging speed, high practical value and promotion value

Active Publication Date: 2021-03-26
川北医学院
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Problems solved by technology

[0007] In addition, the GRAPPA algorithm in the prior art can well avoid convolution artifacts for 2x acceleration, but the reconstruction effect is not good for more than 2x acceleration, the noise is obvious and there are still convolution artifacts.

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  • Improved algorithm for parallel magnetic resonance imaging

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Embodiment

[0031] Such as figure 1 As shown, this embodiment provides an improved algorithm for parallel magnetic resonance imaging, which utilizes K-space data received by phased array coils, and there are L phased array coils in this embodiment.

[0032] Specifically: the improved algorithm of the parallel magnetic resonance imaging of the present embodiment comprises the following steps:

[0033] The first step is to perform R times undersampling (R=2, 3, 4, 5, 6) on the imaged object, that is, to take the n×R row (n=1, 2, 3...), in the unsampled row The data is filled with 0, and the middle low frequency part (can be 16 lines or 32 lines) is used as the calibration area for full sampling to obtain the matrix F;

[0034] Step 2: find conjugate symmetric rows: Different from other GRAPPA algorithms and their improved algorithms, this embodiment adopts the conjugate symmetry of K space. Assuming that the k-space data received by each coil has a total of I lines, the i-th line of data ...

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Abstract

The invention discloses an improved algorithm for parallel magnetic resonance imaging. The algorithm comprises the following steps: performing R-time undersampling on an imaging object, and filling 0into data of an unsampled row; taking the middle low-frequency part as a calibration area for full sampling to obtain a calibration area matrix F, the K space data received by any coil being divided into I rows, and obtaining a result that conjugate symmetry exists between the ith row of data and the (I-i)th row of data; constructing a matrix A by utilizing the calibration area matrix F; acquiringany row of data of the matrix A at the calibration area x (i, j, l), and forming a column vector C; according to the matrix A*W=C, obtaining a weight matrix W in an interpolation window through fitting in combination with a least square method; constructing a prediction matrix D of the undersampled row data; solving a column vector E by using the product of the prediction matrix D and the weightmatrix W in the interpolation window; and filling any column of data of the column vector E into a corresponding position in the calibration area matrix F, removing the position of the originally filled 0 to obtain a reconstructed matrix H, and performing Fourier transform to obtain an image of parallel magnetic resonance imaging.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to an improved algorithm for parallel magnetic resonance imaging. 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 divided into two categories: [0004...

Claims

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Application Information

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IPC IPC(8): G01R33/56
CPCG01R33/56Y02A90/30
Inventor 何汶静魏小琴陈晓文杨汉丰祝元仲
Owner 川北医学院
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