Table 1.
Flow Measurement Parameters
| Spiral 4D | Cartesian 4D | |
|---|---|---|
| Echo time/TR | 3.7/12 ms | 3.4/5.8 ms |
| Number of interleaves | 10 | – |
| Readout duration | 5 ms | 2.5 ms |
| SENSE factor | 1 | 2 |
| Segmentation factor | 1 | 2 |
| FOV | 280 × 280 mm2 | 235–280 × 280 mm2 |
| Matrix size | 100 × 100 | 84–100 × 100 |
| Slices* | 36–40 | 36–40 |
| Voxel size | 2.8‐mm isotropic | 2.8‐mm isotropic |
| Temporal resolution | 48–48.8 ms | 46.4–46.5 ms |
| Flip angle | 8° | 6.5° |
| Velocity encoding | 120 cm/s | 120 cm/s |
| Nominal scan time | 460–510 RR intervals | 1012–1326 RR intervals |
| Actual scan time (without patients, mean + SD) | 13 ± 3 min | 31 ± 7 min |
*Reconstructed slices. A slice oversampling factor of 27% was used to avoid foldover.
FOV = field of view; SENSE, sensitivity encoding; SD, standard deviation; TR, repetition time; RR, R‐wave to R‐wave.