Fig. 1From: Reduced frequencies of Foxp3+GARP+ regulatory T cells in COPD patients are associated with multi-organ loss of tissue phenotypeCentral coronal chest CT emphysema quantification. The quantification of emphysema, based on the RA950, is demonstrated in the representative coronal CT scan from four individuals with varying severity of emphysema. From this classification, normal lung tissue is denoted blue, and emphysema is denoted purple. Patients with more advanced emphysema have more purple areas. RA950: relative area of the CT density histogram voxels < − 950 HUBack to article page