Table I. ACQUISITION PARAMETERS.
| Exp.# | Voxel size (mm3) |
TE1 (imaging) / TE2 (navigator) / TR(ms)a |
b-value (s/mm2) |
#b=0 /DWIb |
Samplingc | Navigator | Tacq (min:sec) |
|---|---|---|---|---|---|---|---|
| 1A | 1.22 | 82/142/2000 | 1000 | 1/3 | Conventional | Yes | 1:36 |
| 1B | 1.09 | 89/157/3500 | 1000 | 1/3 | Conventional | Yes | 2:48 |
| 2A | 1.09 | 65/133/3500 | 1000 | 0/36 | Conventional | Yes | 25:12 |
| 2B | 1.09 | 65/133/3500 | 1000 | 0/36 | Self-nav CAIPI | Yes | 25:12 |
| 3A | 1.09 | 65/133/3500 | 1000 | 0/12 | Conventional | Yes | 8:24 |
| 3B | 1.09 | 64/-/2400 | 1000 | 0/12 | Self-nav CAIPI | No | 5:46 |
| 4A | 1.09 | 65/133/3500 | 1000 | 2/16 | Conventional | Yes | 12:36 |
| 4B | 1.09 | 64/-/2400 | 1000 | 2/16 | Self-nav CAIPI | No | 8:38 |
| 5A | 1.09 | 72/140/3500 | 2000 | 0/1 | Conventional | Yes | 0:42 |
| 5B | 1.09 | 72/140/3500 | 2000 | 0/1 | Self-nav CAIPI | Yes | 0:42 |
| 5C | 1.09 | 78/146/3500 | 3000 | 0/1 | Conventional | Yes | 0:42 |
| 5D | 1.09 | 78/146/3500 | 3000 | 0/1 | Self-nav CAIPI | Yes | 0:42 |
| 6 | 1.09 | 64/-/2400 | 1000 | 6/48 | Self-nav CAIPI | No | 25:55 |
a
3/4 partial Fourier along phase encoding direction was applied for Exp. 2-6. The TRs of Exp. 2-6 were the shortest achievable TRs due to SAR restriction.
b
The number of DWIs refers to the number of scans with different encoding for each experiment. In Exp. 1, three Δky shift was acquired with the same diffusion encoding. In Exp. 2, 12 repetitions along three orthogonal diffusion encoding directions were obtained for SNR evaluation. In Exp. 3, 12 repetitions were acquired with a single diffusion encoding direction along readout.
c
The Self-nav CAIPI samplings for 1.22 mm and 1.09 mm are illustrated in Fig. 2e and f respectively. All b=0 data were acquired with the conventional rectangular sampling.