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 Factor | Conventional DTI (R = 1) | Parallel Imaging with no PPF | |||
|---|---|---|---|---|---|
| With PPF (6/8) | Without PPF | R = 2 | R = 3 | R = 4 | |
| Acquisition time (minutes:seconds) | 2:44 | 3:10 | 2:55 | 3:01 | 3:04 |
| TE (ms) | 82 | 107 | 81 | 76 | 71 |
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.