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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 E2 — Standardization of densitometric indices. Regression equations were calculated from measurements of the densitometric standards (extrathoracic air, blood, and 3 electron density rods) for each CT scan of every subject in relation to the standard density measures of the densitometric standards. The regression equations derived were used to adjust all the densitometric indices for each CT scan of every subject. The figure illustrates derivation of regression equation for standardization of densitometric indices for one of the subjects.