Rapid parallel reconstruction for arbitrary k-space trajectories

摘要

An imaging method comprises acquiring an undersampled magnetic resonance partially parallel imaging (MR-PPI) dataset using a plurality of radio frequency receive coils and reconstructing the undersampled MR-PPI dataset to generate a reconstructed magnetic resonance (MR) image. The reconstructing includes: (i) using a generalized auto-calibrating partially parallel acquisition (GRAPPA) operator or direct convolution to fill in at least some missing data of the undersampled MR-PPI dataset so as to generate an enhanced dataset; and (ii) using an algorithm other than a GRAPPA operator and other than direct convolution to reconstruct the enhanced dataset or to reconstruct the undersampled MR-PPI dataset using the enhanced dataset as an initialization dataset for an iterative reconstruction algorithm. In some embodiments the MR-PPI dataset is a non-Cartesian dataset and a GRAPPA operator for wider radial bands (GROWL) is used in the operation (i).

主权项

1. A method comprising:
acquiring an undersampled magnetic resonance partially parallel imaging (MR-PPI) dataset using a plurality of radio frequency receive coils,
wherein the dataset includes a central k-space region including k=0 that is not undersampled, an intermediate k-space region surrounding the central k-space region that is undersampled at a first acceleration factor R1, and an outer k-space region surrounding the intermediate k-space region that is undersampled at a second acceleration factor R2 where R2>R1; and reconstructing the undersampled MR-PPI dataset to generate a reconstructed magnetic resonance (MR) image, the reconstructing including:
(i) using a generalized auto-calibrating partially parallel acquisition (GRAPPA) operator or direct convolution to fill in at least some missing data of the undersampled MR-PPI dataset so as to generate an enhanced dataset comprising the undersampled MR-PPI dataset and missing data that is filled in by the operation (i), and(ii) using an algorithm other than a GRAPPA operator and other than direct convolution to reconstruct the enhanced dataset or to reconstruct the undersampled MR-PPI dataset using the enhanced dataset as an initialization dataset for an iterative reconstruction algorithm.