Table 1.

µCT automatically extracted parameters

µCT readouts
	Name	Description	Unit	Formula
From P01	$N_{P01}$	Number of voxels at the end of inspiration phase (P01)	–	Counting of lung voxels in P01
	$V_{P01}$	Total lung volume at the end of inspiration phase (P01)	mm3	$N_{P01}·\mathrm{voxel}\mathrm{size}$
	${\mathit{MLA}}_{P01}$	Mean lung attenuation at the end of inspiration phase (P01)	HU	${\sum }_{i=1}^{N_{P01}}{\left(H,U\right)}_i/N_{P01}$
	Air	Volume of air at the end of inspiration phase (P01)	mm3	$\frac{{\mathrm{V}}_{\mathrm{P}01}·{\mathrm{MLA}}_{\mathrm{P}01}}{-1000(\mathrm{HU})}$
From P02	$N_{P02}$	Number of voxels at the end of expiration phase (P02)	–	Counting of lung voxels in P02
	$V_{P02}$	Total lung volume at the end of expiration phase (P02)	mm3	$N_{P02}·\mathrm{voxel}\mathrm{size}$
	${\mathit{MLA}}_{P02}$	Mean lung attenuation at the end of expiration phase (P02)	HU	${\sum }_{i=1}^{N_{P02}}{\left(H,U\right)}_i/N_{P02}$
	FRC	Functional residual capacity: Volume of air at the end of inspiration phase (P02)	mm3	$\frac{{\mathrm{V}}_{\mathrm{P}02}·{\mathrm{MLA}}_{\mathrm{P}02}}{-1000(\mathrm{HU})}$