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. Author manuscript; available in PMC: 2014 Apr 14.
Published in final edited form as: Magn Reson Med. 2007 Jul;58(1):70–81. doi: 10.1002/mrm.21255

FIG. 2.

FIG. 2

An N-echo PERMEATE acquisition. A spatial-spectral excitation is followed by N interleaved EPI readouts, each of which acquires the same 1/Mth of a fully interleaved k-space. Prephasing and rephasing y-gradients are combined for time savings. Gradient spoilers end the acquisition, and slice interleaving fills the TR interval. After every M TR interval a complete k-space is formed for PI calibration, and the subsequent hybrid-space GRAPPA reconstruction of each individual interleaf restores the temporal resolution of each echo back to a single TR.