Table 2.
Results from PC-MRI-measured flow rate with different acquisition parameters
| Protocol | Flow rate (mean and range, mL/s) |
SD | CoV (%) | LDD (mL/s) | ||
|---|---|---|---|---|---|---|
| Voxel (mm3) | NSA | VENC (mL/s) | ||||
| 2.5 | 1 | 200 | 7.30 (7.05–7.61) | 0.16 | 2 | 0.32 (4%) |
| 5.0 | 1 | 200 | 8.74 (8.67–8.83) | 0.05 | 1 | 0.10 (1%) |
| 7.5 | 1 | 200 | 9.49 (9.20–9.59) | 0.12 | 1 | 0.24 (3%) |
| 2.5 | 2 | 200 | 7.54 (7.36–7.71) | 0.12 | 2 | 0.23 (3%) |
| 2.5 | 3 | 200 | 7.73 (7.58–7.90) | 0.09 | 1 | 0.18 (2%) |
| 2.5 | 1 | 300 | 7.38 (7.08–7.70) | 0.21 | 3 | 0.41 (5%) |
| 2.5 | 1 | 400 | 7.38 (7.04–7.52) | 0.14 | 2 | 0.28 (4%) |
| 5.0 | 3 | 200 | 8.41 (8.33–8.50) | 0.07 | 1 | 0.13 (2%) |
| 7.5 | 3 | 200 | 9.48 (9.33–9.58) | 0.08 | 1 | 0.15 (2%) |
| Reference standard | 6.59 (6.50–6–70) | 0.08 | 1 | 0.15 (2%) | ||
CoV Coefficient of variation, LDD Least detectable difference, in both absolute and in relative values (given as % of the mean), NSA Number of signal averages, PC-MRI Phase-contrast magnetic resonance imaging, SD Standard deviation, VENC Velocity encoding