Table 2.
Density and perfusion data for the right lung at RV, FRC and TLC (means ±s.d., n= 7)
| Lung volume | RV | FRC | TLC | Pvolume |
|---|---|---|---|---|
| Volume of right lung imaged (ml) | 523 ± 91 | 580 ± 133 | 1203 ± 207* | <0.0001 |
| Mean density (g cm−3) | 0.37 ± 0.11 | 0.36 ± 0.12 | 0.18 ± 0.04* | <0.0001 |
| Density slope (g cm−4) | −0.059 ± 0.025 | −0.062 ± 0.022 | −0.010 ± 0.017* | <0.0001 |
| Density slope R2 | 0.28 ± 0.10 | 0.30 ± 0.12 | 0.03 ± 0.02* | <0.0001 |
| Mean perfusion (ml min−1 g−1) | 7.8 ± 2.5 | 7.2 ± 2.2 | 6.1 ± 2.9 | 0.052 |
| Height of maximum perfusion (cm) | 8.2 ± 2.6 | 10.3 ± 5.3 | 7.5 ± 3.1 | 0.23 |
| Height of maximum perfusion (%) | 65 ± 14 | 66 ± 11 | 45 ± 9* | 0.0006 |
| Slope of perfusion above maximum (% cm−1) | −7.9 ± 3.3 | −7.8 ± 3.4 | −6.7 ± 3.4 | 0.52 |
| Relative dispersion of perfusion (mean/s.d.) | 0.69 ± 0.12 | 0.68 ± 0.10 | 1.45 ± 0.34* | <0.0001 |
RV, residual volume; FRC, functional residual capacity; TLC, total lung capacity; Pvolume, omnibus P for the effect of lung volume.
*
Significantly different from RV and FRC P < 0.05.