Table 1. Summary of different types of GI indices.

Patient number	GIsim,anat	GImeas,func	GImeas,anat
1	0.338	0.431	0.877
2	0.329	0.373	0.730
3	0.342	0.430	0.882
4	0.328	0.390	0.920
5	0.348	0.342	0.562
6	0.368	0.333	0.768
Median (IQR)	0.343 (0.039)	0.382 (0.088)	0.823 (0.152)*

GI_sim,anat, GI calculated from simulated homogeneous distribution with anatomically derived lung regions. GI_meas,func, GI calculated from measured data with functionally derived lung regions. GI_meas,anat, GI calculated from measured data with anatomically derived lung regions. IQR, interquartile range. *P<0.05 compared to the other GI indices respectively.