1. Volume 106, Issue 3, Pages 806-813 (September 1994)
Correlation of Quantitative CT With Selective Alveolobronchogram and Pulmonary Function Tests in Emphysema 
Yuji Watanuki, M.D., Shunsuke Suzuki, M.D., Masanori Nishikawa, M.D., Akira Miyashita, M.D., Takao Okubo, M.D. 
CHEST 
Volume 106, Issue 3, Pages (September 1994)
DOI: /chest
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Representative CT scan of a patient with COPD (case 8). Top, A conventional CT scan of the lower lung field shows diffuse low attenuation areas. Middle, The black area shows attenuation less than −897 HU, corresponding to emphysema, whereas the white area is nonemphysematous. Bottom, A histogram of the right lower lung field between −700 and −1,024 HU is shown. The area of CT density less than −897 HU (2SD percent) is shaded.
CHEST  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

3. Figure 2
Representative selective alveolobronchogram (SAB) from a patient with COPD (case 12). Arrows indicate enlarged ring shadow. The horizontal bar represents 4 mm.
CHEST  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

4. Figure 3
Relationships between the CT indexes and SAB. In the upper panel, the area of emphysema (2SD percent) also correlates with the DR (p<0.01). In the lower panel, the mean attenuation value (MAV) is highly correlated with the mean diameter of the ring shadows seen on SAB (p<0.01).
CHEST  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions

5. Figure 4
Relationships between the CT indexes and pulmonary function tests. The Dco was highly correlated with the CT indexes of the whole lung, the 2SD percent (A), and the MAV (B) The FEV1 percent was also highly correlated with the 2SD percent (C) and the MAY (D)
CHEST  , DOI: ( /chest )
Copyright © 1994 The American College of Chest Physicians Terms and Conditions