In Vivo Computed Tomography as a Research Tool to Investigate Asthma and COPD: Where Do We Stand?
Figure 5
Ventral views of lung attenuation volume samples, computed using the density mask technique to extract voxels below −850 HU. Green areas are representative of voxels between −850 and −900 HU, and blue areas between −900 and −950 HU. Images (a) and (b) were acquired with spirometrically gated CT scans in a non-severe asthmatic subject, in inspiration (a) and in expiration (b). Same images were acquired at same levels of inspiration (c) and expiration (d) from a severe asthmatic subject.
