Table 5. Accuracy of mean cross-sectional area measured at C2 vertebral level.
| Method | Method | |||
|---|---|---|---|---|
| Accuracy measurements | Manual | DTbM | TbM | ASM |
| Mean (SD) CSA (mm2) | 81.07 (13.3) | 80.97 (14.08) | 80.86 (13.96) | 85.19 (14.52) |
| Mean (SD) Dice similarity coefficient (%) | ||||
| Whole population | – | 97.98 (0.43) | 98.02 (0.38) | 96.76 (0.85) |
| Controls | – | 98.18 (0.33) | 98.2 (0.31) | 96.63 (1.14) |
| ALS | – | 97.86 (0.53) | 97.92 (0.44) | 96.82 (0.98) |
| SMA | – | 98.01 (0.45) | 98.11 (0.39) | 96.83 (0.64) |
| SCI | – | 97.86 (0.34) | 97.87 (0.34) | 96.77 (0.65) |
| Mean (SD) error estimation (%) | ||||
| Whole population | – | -0.25 (2.13) | -0.36 (1.90) | 5.02 (3.62) |
| Controls | – | 0.34 (1.87) | 0.10 (1.78) | 6.21 (2.76) |
| ALS | – | 0.25 (2.64) | 0.11 (2.37) | 5.07 (3.69) |
| SMA | – | -0.63 (2.08) | -0.74 (1.64) | 4.66 (3.75) |
| SCI | – | -0.96 (1.88) | -0.91 (1.79) | 4.13 (4.35) |
Manual segmentation by the experienced operator was the ground truth for accuracy measurements.