3d Multi-slab Diffusion-weighted Readout-segmented Echo-planar Imaging with Real-time Cardiac-reordered K-space Acquisition
نویسندگان
چکیده
Introduction Readout-segmented EPI (rs-EPI) improves diffusion-weighted (DW) image quality through multi-shot, navigated acquisition (1-4). A natural extension of this technique would be a 3D rs-EPI trajectory, enabling more efficient acquisition at SNR-optimal TRs (1-2s), acceleration along multiple dimensions and the acquisition of thin slices. However, the data acquisition and reconstruction must be designed to account for additional motion-induced phase gradients in the z direction. In addition, there are point-spread function (PSF) effects due to relaxation and the presence of any kspace discontinuities, which depend on the 3D readout trajectory. Recent work (5-8) has shown that motion artefacts can be controlled in multiple thin slab 3D acquisitions with single-shot readouts of single kz partitions. We present a 3D, multi-slab version of rs-EPI in both simulation and experiment, and demonstrate reduced motion artefacts with real-time reordering of k-space to the cardiac cycle (2).
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