Table 2.
Normalized root mean square error (NRMSE) and normalized maximum cross correlation (NMCC) for parametric models simulating the parameters related to the ankle joint (i.e., joint space width) and to the US transducers (i.e., translation and rotation of US transducer acting as transmitter). In each parametric simulation, only one parameter of the model was changed, and the other parameters were kept identical to those of the reference model.
| Variable | NRMSE (%) | NMCC |
|---|---|---|
| Joint space width (2 mm) | 65.25 | 0.391 |
| Joint space width (3 mm) | 29.75 | 0.643 |
| Joint space width (4 mm) | 6.29 | 0.976 |
| Transducer x-translation (2 mm) | 9.65 | 0.998 |
| Transducer x-translation (4 mm) | 9.57 | 0.996 |
| Transducer y-translation (2 mm) | 3.96 | 0.992 |
| Transducer y-translation (4 mm) | 11.72 | 0.929 |
| Transducer rotation (37°) | 8064.2 | 0.629 |
| Transducer rotation (25°) | 78.02 | 0.632 |
| Transducer rotation (12°) | 19.59 | 0.924 |