Fig 1. Schematic representation of k-space trajectories.

(a) The EPIK acquisition scheme. Each k-space trajectory is divided into three distinct regions: a keyhole region (K_K) and two sparse regions (K_S). The solid, dashed and fine-dashed lines in K_S regions indicate the sampling positions performed at the 1^st, 2^nd and 3^rd measurements, respectively. The lines in K_K region are sampled every measurement. (b) The modified EPIK acquisition scheme combined with the partial Fourier technique (6/8).