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(a) Schematic of a segmented respiratory navigated 3D Cartesian acquisition scheme. Different segments of k-space are color coded. (b) 3D k-space schematic of hybrid radial kx-ky first (for each kz partition all rays in-plane are acquired first). (c) Hybrid radial kz first (rays in each kz partition are acquired in one heartbeat, and in the next beat the next set of rays for all kz partitions is acquired and so on. Rays in each plane are color coded to illustrate signal consistency.
