1. Lung Density in Extremely Large Healthy Lungs
Leigh M. Seccombe, PhD, Matthew J. Peters, MD, Robert H. Brown, MD, Wayne Mitzner, PhD 
CHEST 
Volume 149, Issue 1, Pages (January 2016)
DOI: /j.chest
Copyright © 2016 American College of Chest Physicians Terms and Conditions

2. Figure 1
Brown et al1 mean lung density (HU) and lung volume continuum. Blue circles = subjects with COPD; gray circles = subjects without COPD; and red circles = additional free diving subjects. HU = Hounsfield unit.
CHEST  , DOI: ( /j.chest )
Copyright © 2016 American College of Chest Physicians Terms and Conditions