Table 1.
Scan parameters of conventional and SMS scans
| Conventional | SMS | |||||
|---|---|---|---|---|---|---|
| PDW | T1W | FS-T2W | PDW | T1W | FS-T2W | |
| AT | 4:36 | 3:42 | 3:58 | 2:22 | 2:17 | 2:56 |
| Total AT | 12:16 | 7:35 | ||||
| TR (ms) | 2000 | 712 | 3500 | 2000 | 650 | 3500 |
| TE (ms) | 20 | 27 | 61 | 21 | 14 | 62 |
| Averages | 1 | 2 | 2 | 1 | 1 | 2 |
| Concatenations | 2 | 3 | 2 | 1 | 2 | 1 |
| Flip angle (deg) | 150 | 120 | 150 | 150 | 120 | 150 |
| Fat suppression | none | none | CHESS | none | none | CHESS |
| Base resolution | 320 | 384 | 320 | 320 | 384 | 320 |
| Phase resolution (%) | 100 | 75 | 70 | 100 | 75 | 70 |
| Parallel imaging | none | GRAPPA | GRAPPA | CAIPIRINHA | CAIPIRINHA | CAIPIRINHA |
| Acceleration factor phase | – | 2 | 2 | 1 | 1 | 1 |
| Acceleration factor slice | – | – | – | 2 | 2 | 2 |
| FOV shift factor | – | – | – | 2 | 2 | 2 |
| Bandwidth (Hz/Px) | 240 | 250 | 220 | 240 | 250 | 279 |
PDW proton-density weighted, T1W T1-weighted, FS-T2W fat-saturated T2-weighted, SMS simultaneous multi-slice, AT acquisition time, TR repetition-time, TE echo time, GRAPPA generalized auto calibrating partially parallel acquisitions, CAIPIRINHA controlled aliasing in parallel imaging results in higher acceleration, CHESS chemical shift selective, FOV field-of-view