Fig. 1.

Schematic of the variable TI MI-EPI acquisition. After the ACS acquisition, each sequence repetition begins by a non-selective inversion followed by the echo planar acquisition of the imaging volume. After every inversion, the slice acquisition order is permuted by shifting the order by one or more slices at a time. A constant readout flip angle (α) is used for the slice-selective excitations. In this illustration, the block shift factor N_shift = 2.