Table 1 Sums of the squared errors between the estimated and true ventilation-to-volume ratio distributions
| Â | Single compartment (1C) | Four compartments (4C) | |
|---|---|---|---|
50% N2 step | 50% N2 step | 10% N2 step | |
Generalized constrained | 0.19 ± 0.15 | 0.07 ± 0.03 | 0.08 ± 0.006 |
Generalized unconstrained | 0.55 ± 0.15 | 0.12 ± 0.01 | 0.12 ± 0.004 |
Classical | 1.21 ± 0.03 | 0.16 ± 0.01 | 0.16 ± 0.003 |
Classical + inspired fraction | 1.20 ± 0.02 | 0.15 ± 0.02 | 0.16 ± 0.002 |