SPEED fast magnetic resonance imaging method based on discrete cosine transform

A technology of discrete cosine transform and magnetic resonance imaging, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, magnetic variable measurement, etc., which can solve the problem of failing to find authorized invention patents or applications.

Active Publication Date: 2014-04-16
镇江利达信息科技有限公司
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However, we have not been able to find any authorized invention patents o

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  • SPEED fast magnetic resonance imaging method based on discrete cosine transform
  • SPEED fast magnetic resonance imaging method based on discrete cosine transform
  • SPEED fast magnetic resonance imaging method based on discrete cosine transform

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[0046] The present invention will be further described below in conjunction with accompanying drawing.

[0047] The present invention mainly includes eight steps: k-space data acquisition, zero-filled Fourier reconstruction, discrete cosine transform, establishment of a double-layer sparse ghost model in the discrete cosine transform domain, overlapping ghost separation based on the least square error method LSE, and inverse discrete cosine transform , registration and summation of multiple ghost shadow maps, and image reconstruction.

[0048] 1. k-space data acquisition

[0049] Such as figure 1 As shown, in the phase encoding PE direction of k-space, a row of data is collected every N rows, and a total of three groups are collected, respectively with S 1 , S 2 and S 3 express. use d 1 , d 2 , d 3 Indicates the offset of each group of undersampled data in the PE direction, and the sampling method is N(d 1 , d 2 , d 3 )express. According to the size of the image, 1...

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Abstract

The invention discloses a SPEED fast magnetic resonance imaging method based on discrete cosine transform. The SPEED fast magnetic resonance imaging method based on discrete cosine transform mainly includes the steps of k space data collection, zero fill Fourier reestablishment, discrete cosine transform, discrete cosine transform domain double-layer sparse ghost model determining, overlapped ghost separation based on LSE, discrete cosine inverse transformation, registering and summation of a plurality of ghost sub-images and image reconstruction. By means of the SPEED fast magnetic resonance imaging method, discrete cosine transform can be used for SPEED data sparse representation and improve image sparseness, and accordingly quality of a SPEED reconstructed image is improved.

Description

technical field [0001] The invention belongs to the field of magnetic resonance image imaging, and relates to a SPEED fast magnetic resonance imaging method based on discrete cosine transform. Background technique [0002] Magnetic Resonance Imaging (MRI) has been widely used in clinical disease detection due to its advantages such as no adverse effects on the body and strong soft tissue resolution ability. However, the clinical application of MRI is often limited by the long data acquisition time. Researchers have greatly improved the speed of MRI data acquisition by improving the performance of MRI hardware, adopting efficient k-space (frequency space) data acquisition trajectories, developing fast sequential and parallel data acquisition, etc., but in many applications, it is still not possible to Fully meet the clinical needs for fast data acquisition, such as brain functional imaging, three-dimensional high-resolution susceptibility weighted imaging and dynamic data ac...

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Application Information

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IPC IPC(8): G01R33/56
Inventor 金朝阳向清三
Owner 镇江利达信息科技有限公司
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