Magnetic resonance image reconstruction method and device
A magnetic resonance image and image technology, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, and magnetic variable measurement, can solve problems such as low channel, ineffective suppression of signal-to-noise comparison, and imaging quality impact. Achieve the effect of improving signal-to-noise ratio, suppressing weight, and removing artifacts
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Embodiment 1
[0076] figure 2 and image 3 It is a schematic diagram and a flow chart of the magnetic resonance image reconstruction method of Embodiment 1 of the present invention. like image 3 As shown, the specific process is as follows:
[0077] Step S001: Acquire fully sampled original K-space of several channels. Each data point in the fully-sampled original K-space has been sampled; or the under-sampled k-space of several channels is collected, and the full-sampled original K-space is obtained by using the correlation method.
[0078] Said correlation methods include, but are not limited to, parallel acquisition reconstruction methods and half-Fourier reconstruction methods.
[0079] Step S002: Carry out preprocessing grouping on the original K space of each channel according to the same rules to obtain several grouping K spaces, the grouping K space is a matrix with the same size as the original K space, and the preprocessing grouping makes each A group of K-spaces includes s...
Embodiment 2
[0105] As mentioned in the background technology, some sequences, such as SE sequences, in order to avoid the influence of FID signals during the acquisition process, adopt the phase cycle method to acquire magnetic resonance signals, so that the FID signals of the odd and even lines in the original K space are positive and negative. on the contrary. Although the acquisition of magnetic resonance signals (K-space data) using the phase cycle method can achieve the effect of moving the FID artifacts to the edge of the image domain, it still cannot remove the FID artifacts. These FID artifacts can be completely removed by using the method of the present invention.
[0106] This embodiment focuses on the application of the method proposed by the present invention in image reconstruction of SE sequences with FID artifacts.
[0107] Figure 7It is a schematic diagram of the magnetic resonance image reconstruction method of Embodiment 2 of the present invention; Figure 8 It is a ...
Embodiment 3
[0122] In the first embodiment, if the acquired K-space is under-sampled, the correlation method is used to obtain the original K-space with full sampling, and then the pre-processing grouping and subsequent image reconstruction are performed. For the under-sampled K-space, another image reconstruction method can also be used: extract the sampled data in the under-sampled K-space, perform preprocessing grouping and subsequent processing on the sampled data, and replace the processed data with The original undersampling of the sampled data in the original K-space, followed by subsequent image reconstruction, can also achieve the corresponding effect. This embodiment focuses on the specific steps of reconstructing the image in this case.
[0123] Figure 10 It is a flow chart of the magnetic resonance image reconstruction method of Embodiment 3 of the present invention, and its specific process is as follows:
[0124] Step S021 , acquiring under-sampled original K-spaces of se...
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