1. Analysis of the “gas trapping” using expiratory CT scans.
Analysis of the “gas trapping” using expiratory CT scans. The subject in a) and b) exhibits minimal gas trapping as indicated by the lower percentage of voxels below -856 HU (highlighted in colour) while the subject in c) and d) has many more highlighted voxels indicating more severe gas trapping. a) and c) Transverse CT images showing the voxels less than -856 HU; b) and d) show these same voxels using the cluster analysis. Images were captured using the Pulmonary Workstation 2.0 image analysis software (VIDA Diagnostics, Coralville, IA, USA).
Harvey O. Coxson breathe 2012;9:36-45
©2012 by European Respiratory Society