Table 2.

Motion assessment. The results of the absolute value of the displacement, averaged over all the images, are displayed. The 3D estimation was performed while the detection algorithm was running. After the identification of the bad 2D localizations, the motion assessment data corresponding to those images were removed. The mean displacement between the localized positions and the CT planned position of the centroid of the fiducials is displayed in mm, together with the standard deviation (STD).

	Absolute 3D displacements between the fiducial and its planned position on planning CT (mm)
	Fiducial 1 (F1)	Fiducial 2 (F2)	Fiducial 3 (F3)
	Mean ± STD	Mean ± STD	Mean ± STD
Case	(Max)	(Max)	(Max)
1	3.4 ± 1.0	3.5 ± 0.7	3.2 ± 0.6
	(5.7)	(5.0)	(4.7)
2	1.2 ± 0.4	1.4 ± 0.3	2.5 ± 0.3
	(2.8)	(2.3)	(4.1)
3	1.2 ± 0.4	2.4 ± 0.2	2.9 ± 0.4
	(3.0)	(2.9)	(4.7)
4	1.7 ± 0.4	1.2 ± 0.5	6.7 ± 0.4
	(3.1)	(3.3)	(7.7)
5	1.5 ± 0.5	1.2 ± 0.3	0.8 ± 0.6
	(3.6)	(2.2)	(2.8)