Table 1.
B0 | Coil | Nx | Ny |
Nz No. of slices |
FoV (mm) | TRa (ms) | TI (ms) |
Flip (deg) |
Plane | Δz (mm) |
RBW (Hz/pixel) |
Time (min:s) |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1.5T | BC | 192 | 192 | 184–208 | 240 × 240 | 3000 | 1000 | 8 | Sagittal PEb = A/P | 1.2 | 162–180 | 9:36–9:38 |
1.5T | MA | 192 | 192 | 160–170 | 240 × 240 | 2300–2400 | 1000 | 8 | Sagittal PE = A/P | 1.2 | 162–200 | 7:11–7:42 |
3.0T | MA or BC | 256 | 256c | 160–170 | 256–260 × 240 | 2300 or 3000d | 853–900 | 8–9 | Sagittal PE = A/P | 1.2 | 240–244 | 9:14–9:22 |
TR is defined here as the repetition time for the inversion pulses.
PE is the phase-encoded direction.
256 is the base resolution. Because the field of view is rectangular at 3.0 T, the net number of acquired phase-encoding steps is approximately 0.94 × 256 = 240.
The longer value of TR = 3000 at 3 T is used only with pulse sequences where the train of gradient echo readouts represents the in-plane phase encoding. Because there are fewer encoded slices than in-plane phase encodings in the 3 T protocol, the net acquisition time is approximately equal to the TR = 2300 msec case.
MA = multicoil phased-array head coil; BC = birdcage or volume head coil.