TABLE 1.
Sequence Parameters for 3D-QALAS With CS, 3D-QALAS Without CS, and Conventional Imaging
| 3D-QALAS | Conventional | ||||
|---|---|---|---|---|---|
| Parameter | With CS | Without CS | T1WI | T2WI | FLAIR |
| Acquisition dimension | 3D | 3D | 3D | 2D | 2D |
| Acquisition plane | Axial | Axial | Axial | Axial | |
| Repetition time, ms | 8.6 | 7.7 | 4500 | 9000 | |
| Echo time, ms | 3.5 | 3.1 | 122.3 | 120 | |
| Flip angle, degree | 4 | 11 | — | — | |
| Bandwidth, Hz/pixel | 244.1 | 244.1 | 162.8 | 195.3 | |
| Field of view, mm | 256 × 205 × 146 | 256 × 218 | 240 × 240 | 240 × 240 | |
| Matrix | 256 × 205 × 146 | 256 × 218 | 320 × 224 | 320 × 224 | |
| Interpolated matrix | 512 × 410 × 292 | 256 × 218 | 320 × 224 | 320 × 224 | |
| Slice thickness, mm | 1 (0.5)* | 1 (0.5)* | 4 | 4 | |
| Slice gap, mm | — | — | 1 | 1 | |
| Parallel imaging (ARC) | 2 × 1 | 2 × 1 | 2 × 1 | 2 × 1 | |
| Compressed sensing | 1.9 | — | — | — | — |
| Acquisition time | 5:56 | 11:11 | 5:45 | 2:06 | 2:33 |
*Slice thicknesses after zero-fill interpolation.
3D-QALAS, 3D-quantification using an interleaved Look-Locker acquisition sequence with a T2 preparation pulse; ARC, Autocalibrating Reconstruction for Cartesian imaging; CS, compressed sensing; FLAIR, fluid-attenuated inversion recovery images; T1WI, T1-weighted imaging; T2WI, T2-weighted imaging.