Table 1.

Description of clinical cases and associated manually selected landmarks used for DIR analysis. Here displacement indicates the 3Ddistance between each pair of landmarks in maximum exhale and inhale images, and SD represents standard deviation.

Case	Number of landmarks	Displacement mean (mm)	Displacement SD (mm)	Image dimension	Voxel size (mm)
1	1280	4.01	2.91	256× 256× 94	0.97× 0.97× 2.5
2	1487	4.65	4.09	256× 256× 112	1.16× 1.16× 2.5
3	1561	6.73	4.21	256× 256× 104	1.15× 1.15× 2.5
4	1166	9.42	4.81	256× 256× 99	1.13× 1.13× 2.5
5	1268	7.10	5.15	256× 256× 106	1.10× 1.10× 2.5