Skip to main content

Table 3 Relationship between measured and predicted gas volumes

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)

Quanjer and colleagues [9, 12]

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)

Quanjer and colleagues [9, 12]

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

  1. CT, computed tomography; FRC, functional residual capacity; HU, Hounsfield units; TLC, total lung capacity.