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. 2014 Mar;133(3):729–738.e18. doi: 10.1016/j.jaci.2013.09.039

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© 2013 The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig E4 — Fractal dimension of low attenuation areas in lungs. Coronal CT image showing areas of low attenuation less than the threshold CT attenuation value of −950 HU on inspiratory scans (A) and −850 HU on expiratory scans (C), with each lobe coded with a different color. Respective low attenuation clusters are shown in B and D, which are used to assess the size and distribution of emphysematous lesions and air-trapping areas, respectively.