Table 2:
Results of the healthy subject analysis in terms of peak flow rate difference, peak flow rate repeatability, stroke volume difference, stroke volume repeatability, and pulsatility index difference
| Comparison Pairs |
Bland-Altman |
Orthogonal Regression |
|||||
|---|---|---|---|---|---|---|---|
| A (Frames) | B (Frames) | Bias | LoA | P | Equation | ρ | |
| Peak flow rate difference (mL/s) | 2D reference-1 (30) | 4D PROUD-1 (30) | 0.31 ± 0.13 | 1.41 | .22 | y = 1.14x – 0.80 | 0.67 |
| 2D reference-1 (30) | 4D PROUD-1 (15) | 0.51 ± 0.13 | 1.44 | .03 | y = 1.15x – 1.04 | 0.66 | |
| 2D reference-1 (30) | 4D PROUD-1 (7) | 0.76 ± 0.13 | 1.44 | <.01 | y = 0.90x – 0.42 | 0.60 | |
| 2D reference-1 (30) | 4D SENSE (7) | 0.79 ± 0.17 | 1.81 | .01 | y = 0.83x – 0.19 | 0.36 | |
| Peak flow rate repeatability (mL/s) | 4D PROUD-1 (30) | 4D PROUD-2 (30) | 0.14 ± 0.08 | 0.90 | .61 | y = 0.87x + 0.28 | 0.87 |
| 4D PROUD-1 (15) | 4D PROUD-2 (15) | 0.12 ± 0.08 | 0.87 | .90 | y = 0.84x + 0.37 | 0.88 | |
| 4D PROUD-1 (7) | 4D PROUD-2 (7) | 0.09 ± 0.07 | 0.71 | .77 | y = 0.90x + 0.17 | 0.89 | |
| 2D reference-1 (30) | 2D reference-2 (30) | 0.19 ± 0.08 | 0.86 | .38 | y = 1.01x – 0.23 | 0.86 | |
| Stroke volume difference (mL) | 2D reference-1 (30) | 4D PROUD-1 (30) | 0.11 ± 0.09 | 0.94 | .53 | y = 0.99x – 0.08 | 0.64 |
| 2D reference-1 (30) | 4D PROUD-1 (15) | 0.11 ± 0.09 | 0.94 | .45 | y = 0.97x – 0.04 | 0.64 | |
| 2D reference-1 (30) | 4D PROUD-1 (7) | 0.14 ± 0.09 | 0.93 | .36 | y = 0.95x – 0.03 | 0.64 | |
| 2D reference-1 (30) | 4D SENSE (7) | 0.15 ± 0.11 | 1.18 | .36 | y = 1.06x – 0.29 | 0.46 | |
| Stroke volume repeatability (mL) | 4D PROUD-1 (30) | 4D PROUD-2 (30) | 0.08 ± 0.04 | 0.43 | .57 | y = 0.98x – 0.05 | 0.93 |
| 4D PROUD-1 (15) | 4D PROUD-2 (15) | 0.08 ± 0.04 | 0.42 | .60 | y = 0.98x – 0.04 | 0.92 | |
| 4D PROUD-1 (7) | 4D PROUD-2 (7) | 0.07 ± 0.04 | 0.44 | .64 | y = 1.00x – 0.08 | 0.92 | |
| 2D reference-1 (30) | 2D reference-2 (30) | 0.06 ± 0.04 | 0.47 | .80 | y = 1.10x – 0.28 | 0.92 | |
| Pulsatility index difference (a.u.) | 2D reference-1 (30) | 4D PROUD-1 (30) | 0.01 ± 0.04 | 0.39 | .41 | y = 1.97x – 0.82 | 0.15 |
| 2D reference-1 (30) | 4D PROUD-1 (15) | 0.18 ± 0.04 | 0.39 | <.01 | y = 1.51x – 0.60 | 0.10 | |
| 2D reference-1 (30) | 4D PROUD-1 (7) | 0.31 ± 0.03 | 0.33 | <.01 | y = 0.01x + 0.51 | 0.01 | |
| 2D reference-1 (30) | 4D SENSE (7) | 0.31 ± 0.03 | 0.35 | <.01 | y = 0.03x + 0.50 | 0.02 | |
Note:—LoA indicates limits of agreement; a.u., arbitrary units.