Figure 1

Pulse sequence and acquisition strategy. The pulse sequence diagram (a) shows the windowed-sinc excitation pulse and one spiral interleaf from the 24-interleave dual-density spiral readout. The k-space diagram (b) shows the k-space trajectories of all spiral interleaves. A 0.6-ms fully-sampled central region is used for SPIRiT kernel calibration. For each slice, the 24 spiral interleaves are acquired continuously for 2 R-R intervals (c), and sliding window reconstruction is used to reconstruct 40 frames per slice location. The slice location is incremented every 2 R-R intervals until the desired volume has been imaged.