Table 3.

Comparison of registration results for the phantom and a sample patient dataset for our in-house B-spline-based method, using the same parameter settings. The results for error in registration of the inhale state to other deformation states of the phantom (1 and 2 cm compressions) are also shown.¹

		RL (mm)	AP (mm)	SI (mm)	3D (mm)
Sample patient	$\overline{d}$	−1.0	−0.8	−0.5	2.2
	σ	1.2	2.1	1.8	2.4
	dmax	−3.3	−5.1	−3.3	6.9
Phantom 3 cm diaphragm compression	$\overline{d}$	0.0	−0.1	−0.2	0.8
	σ	0.4	0.4	0.8	0.6
	dmax	−1.7	−1.3	−3.1	3.1
Phantom 2 cm diaphragm compression	$\overline{d}$	−0.2	−0.2	−0.2	0.7
	σ	0.3	0.4	0.6	0.4
	dmax	−1.5	−1.4	−2.3	2.3
Phantom 1 cm diaphragm compression	$\overline{d}$	−0.3	−0.2	−0.1	0.7
	σ	0.3	0.3	0.7	0.5
	dmax	−1.1	−1.0	−2.8	2.8

^a$\overline{d}$ is mean error; σ is standard deviation of error; and d^max is maximum error in estimation of marker position.