From: Limits of normality of quantitative thoracic CT analysis
Lung volume | Study | Estimated gas volume | Delta vs. measured supine gas volume | Estimated gas/tissue ratio | Estimated CT number (HU) |
---|---|---|---|---|---|
TLC, sitting position (ml) | 5,501 ± 624 | 1,779 ± 849 | 6.4 ± 0.92 | -863 ± 17 | |
Cordero and colleagues [7] | 6,011 ± 1,025 | 1,899 ± 880 | 6.54 ± 1.02 | -865 ± 18 | |
Roberts and colleagues [10] | 6,008 ± 881 | 1,901 ± 845 | 6.56 ± 1.03 | -865 ± 18 | |
Roca and colleagues [11] | 6,960 ± 634 | 2,855 ± 886 | 7.67 ± 1.32 | -882 ± 17 | |
TLC, supine position (ml) | Measured | 4,066 ± 1,190 | - | 4.42 ± 1 | -805 ± 48 |
FRC, sitting position (ml) | 3,160 ± 434 | -950 ± 909 | 3.48 ± 0.54 | -774 ± 27 | |
FRC, supine position (ml) | Ibanez and Raurich [8] | 2,126 ± 358 | -1,984 ± 926 | 2.32 ± 0.35 | -696 ± 31 |