Table 1.

The error (Euclidean distance between actual position and CoM estimation) of each target of 3D-motion traces in the three directions.

	Typical	Baseline	Predominantly	High frequency
Target	case	shifts	left-right	breathing
size	Mean error	Mean error	Mean error	Mean error
37 mm	1.1	1.1	1.3	1.9
28 mm	1.1	1.1	1.3	1.7
22 mm	1.1	1.1	1.4	1.8
17 mm	1.2	1.2	1.4	1.7
13 mm	1.2	1.3	2.0	2.0
10 mm	2.3	2.2	2.6	3.9
Overall	1.3 ± 0.5	1.3 ±0.4	1.7 ± 0.5	2.2 ± 0.9