1. The Role of Computed Tomography in Chronic Obstructive Pulmonary Diseases 
Thaddeus F.-C. Sze, MD, Matthew G. Ditzler, MD, Eric M. Walser, MD, William J. Calhoun, MD 
The Journal of Allergy and Clinical Immunology: In Practice 
Volume 3, Issue 4, Pages (July 2015)
DOI: /j.jaip
Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

2. Figure 1
Normal CT of the chest: apex (A), mid-great vessels (B), carina (C), diaphragm (D).
The Journal of Allergy and Clinical Immunology: In Practice 2015 3, DOI: ( /j.jaip )
Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

3. Figure 2
CT in emphysema demonstrating apical (A) and mid-field (B) hypodensities (arrows), and bullae (chevrons).
The Journal of Allergy and Clinical Immunology: In Practice 2015 3, DOI: ( /j.jaip )
Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

4. Figure 3
CT in chronic bronchitis. Note thickened airway walls (A, chevron), mucus in airways (B, arrow), and mosaic pattern due to uneven air trapping on expiratory scan (lower panel, C).
The Journal of Allergy and Clinical Immunology: In Practice 2015 3, DOI: ( /j.jaip )
Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

5. Figure 4
CT in bronchiectasis. Note enlarged, nontapering airways (A and B, right lung, chevrons) and bronchoarterial ratio of more than 1 (A and B, central vessels). There is associated bulla formation (B, right lung, arrow). Exaggerated cystic or varicose bronchiectasis can be seen in conditions such as allergic bronchopulmonary aspergillosis (C, hollow arrows).
The Journal of Allergy and Clinical Immunology: In Practice 2015 3, DOI: ( /j.jaip )
Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions