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.
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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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