Table 2.

The characteristics of landmarks.

	Landmark number in lungs			Average displacements (standard deviation) (mm)
C	Total	Left	Right	Intraobserver error (mm)	3D- Euclidean	Anterior–posterior	Left–right	Superior–inferior
1	1560	802	758	0.77 (1.01)	9.42 (4.81)	1.28 (1.23)	1.17 (1.05)	6.10 (4.49)
2	1268	661	607	0.92 (1.16)	7.10 (5.15)	1.74 (1.66)	0.86 (0.96)	6.30 (5.45)
3	398	204	194	0.81 (1.32)	11.59 (7.87)	2.13 (1.54)	1.28 (1.17)	10.85 (8.29)
4	342	117	165	0.75 (1.09)	7.82 (3.99)	2.98 (1.93)	1.25 (1.02)	6.45 (4.51)
5	1280	672	608	0.85 (1.24)	4.01 (2.91)	0.67 (0.79)	0.58 (0.62)	3.68 (3.04)
6	419	230	189	0.97 (1.38)	11.10 (6.98)	2.53 (2.10)	2.15 (1.89)	10.21 (6.97)