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Acquisition times and echo times (TE) for conventional DTI with and without PPF and mSENSE- or GRAPPA-based DTI sequences with varying acceleration factors (R)
Acceleration FactorConventional DTI (R = 1)Parallel Imaging with no PPF
With PPF (6/8)Without PPFR = 2R = 3R = 4
Acquisition time (minutes:seconds)2:443:102:553:013:04
TE (ms)82107817671
  • Note:—TR was kept constant at 2.8 seconds for DTI with PPF and parallel imaging, whereas it was 3.3 seconds for DTI without PPF. DTI indicates diffusion tensor imaging; PPF, phase partial Fourier; mSENSE, modified sensitivity encoding; GRAPPA, generalized autocalibrating partially parallel acquisitions.