Method for calculating signal-to-noise ratio in parallel acquisition image reconstruction
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Abstract
The invention discloses a method for calculating the signal-to-noise ratio (SNR) in parallel acquisition image reconstruction, comprising: determining a reconstruction expression for a linear operation of the image reconstruction; determining a weighted coefficient according to the reconstruction expression; calculating the SNR according to the weighted coefficient and the raw data. The SNR not only is relevant to the geometric shape and position of the coils, but also is influenced by the reconstruction method and the sampling mode. The SNR is calculated based on contribution of the raw data at positions in the reading direction from all the phase-coding lines in all acquisition channels. It reflects more precisely the loss of the SNR in the parallel acquisition image reconstruction, especially the changes in the SNR caused by the number of the reference lines combined during the reconstruction.
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Citations
31 Claims
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1-12. -12. (canceled)
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13. A method for calculating a signal-to-noise ratio of a parallel-acquired image of an object in a parallel acquisition image reconstruction, comprising:
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determining a reconstruction expression for a linear operation of the image reconstruction, ρ
=Mr, wherein ρ
is a reconstructed image of the parallel-acquired image, M is the reconstruction expression, and r is raw data of the parallel-acquired image;determining a weighted coefficient of the image reconstruction according to the reconstruction expression; and calculating the signal-to-noise ratio of the parallel-acquired image according to the weighted coefficient and the raw data. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An image device, comprising:
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an image acquisition device that acquires a parallel-acquired image of an object; and an image processing unit that; determines a reconstruction expression for a linear operation of a parallel acquisition image reconstruction, ρ
=Mr, wherein ρ
is a reconstructed image of the parallel-acquired image, M is the reconstruction expression, and r is raw data of the parallel-acquired image,determines a weighted coefficient of the image reconstruction according to the reconstruction expression, and calculates the signal-to-noise ratio of the parallel-acquired image according to the weighted coefficient and the raw data.
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Specification