Table 1.
Sequence parameters. The single-shot GRE-EPI data were acquired with an acceleration factor (R) of 2 in order to reduce the readout length and thus distortion.
| Parameter | 2D GRE-EPI | 3D GRE-EPI | 3D SPGR | 3D bSSFP |
|---|---|---|---|---|
| RF spoiling | N/A | 117° inc. | 117° inc. | N/A |
| Grad. spoiling | N/A | 2π phase | 2π phase | N/A |
| Excitation flip angle | 90° | 30° | 30° | 30° |
| TR | 3500 ms | 72 ms | 12 ms | 12 ms |
| TE | 30 ms | 30 ms | 6 ms | 6 ms |
| Segmentation | Single-shot | 48 lines per TR | 8 lines per TR | 8 lines per TR |
| Parallel acceleration | R = 2 | None | None | None |
| Imaging plane | Coronal |
|---|---|
| Readout bandwidth | 1860 Hz/pix |
| Field of view | 192 × 192 × 48 mm |
| Matrix size | 96 × 96 × 24 |
| Resolution | 2×2×2 mm |
| Tvol | 3500 ms |
| Number of volumes | 60 volumes |
| Total imaging time | 210 s |